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- Опубликовано: 16 авг 2024
- Browsing through my collection of sensors, I found quite a few which deal with measuring of light. Today we will have a look at these sensors, bring them in some order, and test them. In the end, you should be able to decide which sensor is best to use for your project.
Today’s selection covers the following areas:
- RGB sensors
- Lux sensors
- UV sensors
- IR Sensors
- Proximity/gesture sensors
I am a proud Patreon of GreatScott!, Electroboom, Electronoobs, EEVblog, and others.
Links:
Color Sensors:
TCS3200:
TCS3414: s.click.aliexp...
TCS34725: s.click.aliexp...
ISL29125: s.click.aliexp...
Illuminance / Lux Sensors
BH1750: s.click.aliexp...
TSL2561: s.click.aliexp...
TSL2591: s.click.aliexp...
LDR: s.click.aliexp...
Phototransistor: s.click.aliexp...
UV-Sensor:
ML8511: s.click.aliexp...
Proximity / Gesture Sensors
APDS-9960: s.click.aliexp...
AP3216C: s.click.aliexp...
TOF Sensor
VL53L0X: s.click.aliexp...
VL53L1X (Long Range) : s.click.aliexp...
Sketches: github.com/Sen...
Table of content:
01:17 : Episode 269 (2019-05-19): "#269 Infrared Light: Raspberry IR Camera
and cheap Spectrometer (i-Phos)"
youtube DOT com/watch?v=sttQAL4r4TQ
01:58 : Start of RGB (colour) sensors part
03:36 : Second peak in the infrared for the colour sensor
05:36 : White LEDs emit more in the blue part of the spectrum
05:49 : Start of colour sensors TCS3414/TCS34725 part (I²C interface)
en DOT wikipedia DOT org/wiki/I%C2%B2C
07:19 : Example of usefulness of 3D printing
07:33 : Start of the Lux / illuminance sensors part (BH1750, TSL2561, TSL2591,
noname LDR, and noname phototransistor)
08:18 : Wife joke
08:50 : Start of the BH1750 part
09:45 : Start of the TSL2561 part
10:27 : Start of the LDR part
11:04 : Start of the phototransistor part
11:10 : 220 kΩ series resistor (collector)
11:23 : Application of an LDR for monitoring a system's status LED.
11:41 : Start of the UV sensor part (ML8511)
en DOT wikipedia DOT org/wiki/Ultraviolet
13:00 : Start of the infrared (IR) sensors part
13:18 : IR sensor TSOP1838 (only output for modulated light at 38 kHz)
13:46 : Start of the proximity sensors, etc. part (APDS-9960 and AP3216C)
15:32 : Start of the AP3216C part
15:53 : Roundup
The links above usually are affiliate links which support the channel (no additional cost for you).
Supporting Material and Blog Page: www.sensorsiot.org
Github: www.github.com...
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Hi, the text at 4:00 is too small,
and thanks for the great content
Thanks for the feedback. I started to use OBS and did not get everything right. Next time I will change it.
@@AndreasSpiess you can just crop the view in your video editing software.
@@TheHellisYea but in OBS he can just drag it to be bigger part of the screen which is easier than editing software.
Timely recording for me. I was trying to get UV readings with a VEML6075. Reads nicely but discovered it is very directional. I'd need a solar tracker for it to measure solar UV consistently.
I like your videos, Andreas. They have a good "signal/noise ratio"
Cool, thanks
i.e. concise
These sensor / board comparison videos are my favorite. They're always informative and help me out in my projects.
Thank you!
Congrats: You hit the 200.000!! And again a great Video. Thanks for that and stay healthy. Have great easter holidays.
Thank you. As an engineer I think in dB. So the next important step is 1 mio ;-) Happy Easter, too!
Yes he deserve for it
Thanks again for a great video. I specially enjoy these compilation videos which compare similar devices and helps us followers save a lot of time searching for the info you kindly bring us in the usual well structured and easy to follow videos
Glad you enjoyed it! These compilations help me too ;-)
Congrats Andreas!! Your videos should be within a Public Electronic Wikipedia as a reference! Greetings from Spain!
Maybe one day ;-) Thank you
This video arrived in the perfect time for me, today I was researching the detection of gamma and beta radiation using photodiodes as a replacement for Geiger-Müller tubes, so this video was very handy!
Congrats for the 200k! :D
Thank you! And good luck with your project.
I want to thank you for your work. You've been so helpful, every time I want to buy a new sensor for a project there's a video of you trying the most common available and making a thoroughly made review about it. So, thank you you've made much lighter the work otherwise I've had to make in order to choose the right sensor for my project
You are welcome. Glad my channel is helpful for you!
Thanks for dedicating your time to another great video! :)
Right now we are developing a project that needs a light sensor and after a close examination we've went fo the same IC TCS34725.
Very cool!
Thanks, Andreas! That will help me for an advanced line following modul. See you next UKW conference hopefully!
We will see if hte borders are open till then ;-)
You have covered all sensors in my treasure. Nice explanation. Thanks !!! ✨✨✌
My pleasure 😊
I love the way Andreas shares his own mistakes and that self-deprecating humour is wonderful!
Thank you. We all make mistakes. The difference is how we deal with it...
@@AndreasSpiess your method (I use a similar one) allows us to demonstrate to our peers and students that's to "err" is not just natural but part of a healthy learning process. By brushing our mistakes under the carpet or worse, denying them, we create an atmosphere of mistrust and fear that only hampers learning.
Honestly Andreas, I wish there were more RUclips instructors (and teachers in general) like you out there. Humanity would be far less self-destructive if there were.
Thank you for your effort and time spent on this Topic. Regarding your awning: What also could be helpful for you is the cloudage. I am measuring far IR Temp with a Melexis MLX90614 and environmental Temp with an BM280 or SHT35 (you would prefere the Swiss one). Then I calculate (or rather more guess) the cloudage.
This is a very interesting concept! Maybe I add a few additional sensors to my Lux meter and compare their readings...
@@AndreasSpiess him gokd sir...i, too was thinking about suggesting an IR sensor, as the luxmeter will not 'see' the IR that is heating your home...still, if it sees overall brightness, it would give a 'useful' correlation to insolation...
I would love to see a Video on different sensor types and comparing the usefulness for this scenario.
Thanks for the video. I've been using the GY-49 / MAX44009 module for measuring lux in my greenhouse (to calculate the total moles of light the plants receive). It claims to have a range up to 188,000 lux.
Thanks for the tip!
Thanks for the informative video. I made a rgb sensing setup yesterday using the AS7262 chip. Though expensive, it is easy to work with and accurate.
I looked at the sensor in the past, but was driven away by the high price. Now I ordered one. Thanks for the tip!
Well that video brightened a dull day (sorry).
Learnt a lot - never realised the sensors where so different. I’ll be following up the gesture sensor, thank you for publishing your code for that.
One thing to note - a significant amount of ‘white’ paper is actually blue to give a clean cold look rather than a warm tint.
You are right for teh paper (AFAIK not in all countries equally). But here I measured the spectrum of the diodes without paper. So both effects would add up :-(
An LED will also work as an ambient light detection sensor. First used IIRC by HP in calculators, measuring the voltage of 7-segment displays where the LED segment was off, to determine the current to drive the display segments, according to ambient light. So you wouldn't suffer retinal damage in the lab from a display readable in outdoor daylight.
I assume they use the same effect as the phototransistors. But I di not know that they are very sensitive.
Hi Andreas, video with lot of tehnical details and extensive comparison of different sensor available on the market. I feel bad that I did not find your video for this long time.. Once again Thank you so much.. I see a German accent in your explanation. Danke schön.
Thank you for your nice words!
Worked so hard trying to fix the APDS9960 with no luck, thank you!!!
You are welcome!
hi Andreas i like those videos when you talk about different sensors and compare them keep up the good work , i think your channel will become the reference in sensors boards for arduino and MCUs
Glad you like them!
Hello Andreas,
I have worked for TAOs since long before we were purchased by AMS. You are correct the TCS3200 is outdated. Also the TCS3414 as well. Neither of these have IR filters because when they were designed the technology to deposit the filter directly on the chip was new and very expensive. You are right the TCS34725 is the only AMS part you had that is not obsolete. BTW the Avago part is really an AMS part. TCS3223 I believe.
AMS now has a TIme of Flight device you should try. This is very interesting part.
Oh, and that TSL2561 was used as the Ambient Light Sensor by Apple in the very first iPhone. Those have a very wide dynamic range because you have an analog gain setting and you can also set the integration time from 2.7ms all the way up to 65535 x 2.7ms.
Great video!
DE N5BOC
Thankl oyu for the info. I still struggle with both sensors out in the sunlight. As far as I see TCS34725 is saturated and the TSL 2561 sometimes provides strange values. I have to investigate further and also ordered some ND filters to reduce the light energy.
Happy Easter, Andreas!
Thanks for another great video!
You are welcome!
You know the wife is paying attention when she starts mocking your engineering choices. :D Thanks for the comparison -- I hadn't even heard of half of these. Time for another shopping round...
No hurry. Logistics anyway does not work properly for the moment. I am waiting and waiting...
In my current project I am designing a sensor for determining distance with a red 5mW laser diode. I would like to be able to use these readings to control the response of a small dc stepper motor for controlling an X/Y axis small milling table. I have a lot to learn and I am sure this information will set me in the right direction. I started thinking about this project only earlier today, so this video came out with perfect timing for my needs. Thank You for all of your help over the past few years that I have been developing my understanding of these concepts.
Maybe you look also at the TOF and Lidar sensors.
I worked in lighting for 10 years. The best light sensor in lux, in my humble opinion, is the Texas Instrument OPT3001. I scanned across the entire visible spectrum, from 380nm to 780nm in 20nm steps, and the sensor actually fits almost perfectly the CIE-defined eye sensitivity curve. It is the best light sensor I could measure. In addition to adjusting to the sensitivity of the human eye, it can measure from 0.1 lux to 100,000 lux. This dynamic range of measurement is amazing.
Thank you for the tip. I ordered one.
Nice video. Btw, don't worry, my wife also laughs with my experiments quite often.... so you're not alone ;-)
Good to hear! Not really dangerous for usi, I think ;-)
Thanks for a lovely video on light sensors! Really appreciate your work and dedication.
My pleasure!
superb explanation of content and inclusion of initial targets and end results for complete understanding! God bless you this video came as ray of hope for my works!!
Glad it was helpful!
a useful and educational video. liked it very much. The information you provided useful very well for me.
Glad to hear that! Have a nice Sunday!
Very interesting video, many of these devices I have never used. Things have certainly come a long way since the OCP71 (or OC71 with the paint scratched off!). I have a WEMOS which monitors the temperature and humidity in my loft, I think I will add a light sensor to warn if the loft lights are left on when the hatch is closed. Bob
Yea, the world became simpler and better in this respect.
Very glad to have found this channel and this video. Would like to have seen more info on UV sensors, particularly for a weather station to detect the UV level outdoors.
You can find other UV sensors. Just make sure that the protection does not block UV (e.g. Glas blocks UV)
Sure, Maaaaan. I like your form to explaint the sensors that I use, thank you very much
You are welcome!
Always interesting ideas to get inspiration in the Arduino community thanks for sharing.
Glad you enjoyed it!
I really like the last sensor
Me too ;-)
As always very informative and useful. Thank you Andreas :)
My pleasure!
Bloody hell, what a great video :-) Thanks a 1 000 000 for the content, very interesting and illuminating informations.
Glad you enjoyed it
Frohe Ostern, Andreas und vielen Dank für die tollen Videos. Ich freue mich, dass du die 200.000 Abonnenten erreicht hast - ein großartiger Meilenstein: Gratulation! Bleib gesund in dieser schwierigen Zeit! Vielleicht brauchen wir jetzt eine Definition von dBs(ubscriber), dann wünsche ich alsbald +3dBs ;)
Ich bin etwas spät für Osterwünsche. Dankeschön! Betreffend 200'000: Da denke ich in 10 dB und konzentriere mich auf die Million ;-)
Hello, I use the MAX44009 lux sensor from Maxim integrated, widely available from Aliexpress. I use it to adapt the brightness of my displays
Thanks for the info!
I use the same sensor on a GY-49.breakout board. However every Arduino library for the MAX44009 I downloaded had the same mistake in reading lux levels correctly. Looks like everyone copied the same error from the original library 😁
It's an excellent lux level sensor with a huge 22 bit dynamic range, ultra low current and IR/UV blocking filters.
here is the code I use, is it okay ?
#define DATA_LUX_HIGH 0x03
#define DATA_LUX_LOW 0x04
float MAX44009::getLux(void)
{
int luxHigh = readI2CAddr(DATA_LUX_HIGH);
int luxLow = readI2CAddr(DATA_LUX_LOW);
int exponent = ( luxHigh & 0xf0 ) >>4;
int mant = ( luxHigh & 0x0f )
// Request 2 bytes of data
Wire.requestFrom(0x4A, 1);
// Read 2 bytes of data luminance msb, luminance lsb
if (Wire.available() == 1)
{
data[1] = Wire.read();
}
// Convert the data to lux
int exponent = (data[0] & 0xF0) >> 4;
int mantissa = ((data[0] & 0x0F)
Very comprehensive as usual and a superb reference for the future.
Glad you think so!
Thanks in advance for your comments
Thank you for another interesting video in a series that will hopefully be continued 👍 At last no sensor or web based service can replace the wifes skills and predictions 😁
You bet!
If someone really wants to measure the human perceived color values, better use a tri-stimulus sensor in the XYZ colorspace. They are also made by AMS, an Austrian company. There is also an option for sensing 18 channels in parallel with 20nm bandwith for each channel.
You are right. Unfortunately they are a little more expensive...
Hi Andreas, thanks for another great video. I just want to mention that LEDs can also be used as light sensor for some applications. I am using an array of 3 LEDs for an ultra low cost 3-channel spectrometer.
Here is a link wiki.analog.com/university/courses/electronics/electronics-lab-led-sensor
Thank you for the link!
Clear 10mm LED, two digital pins = very good detection of sunlight levels. In a nutshell, the LED is capacitively charged by feeding a reverse voltage into it (pins set to OUTPUT), then the decay of that voltage is measured as it slowly leaks into the (now) INPUT pins of the MCU. The more light there is, the faster it discharges. I've used it successfully for quite a few projects, no ADC needed.
Good idea. Thanks!
Do you have an example of this?
@@marcelachternaam9249 Search for "LED as light sensor". The sparkfun article explains how it works, the instructable article shows a sketch, the stackoverflow describes the principle, pasting the text here:
Set Port A output high
set Port B output low // this makes sure the led is discharged
wait 1mS
set Port A output low
set Port B output high // reverse bias and charge
wait 1mS
set Port B as input // Port B is high impedance input
time how long for Port B to read low
Have you considered putting sensors in solar garden lights? You get a solar panel, a battery and an enclosure for a relatively cheap price. For instance temperature and moisture measurements in the greenhouse.
You probably need a buck-converter to get the 3.3v needed from a 1.2NiCd or 3.2LiOn, but still.
If the ESP went into deep sleep, and only sends occasionally, I guess most lamps could supply the power.
Good idea. I started to build a combination of a Lux, an UV, and an RGB sensor. In addition it communicates via 2.4GHz LoRa. The MPU is an Arduino Mini which Igels it’s Takt from an RTC Module. Still a lot of LEDs, so I do not know the current consumption. But it needs some space.
Thanks for a great video! I use VEML7700 or VEML6030 mostly for it's low sleep current. Not at Aliexpress but at Adafruit as a module.
Thanks for sharing!
Great test as always
Thanks for sharing 👍😁
My pleasure!
@andreas If you use a lux sensor for your awning you'll need to keep adjusting it every winter for when you want to sit out in the sun. It might be better to use a temperature sensor instead. Or maybe mix both (lux and temperature) and make some Node-RED flow for it!
Sounds like a project! 😉
node red should be able to do some simple if-then-else to avoid wrong extractions...
wow , I thought I had alot of light sensor modules to test, wow Some of these I have never seen.
And during cleanup I found two additional ones ;-)
Thanks for such a nice sensors comparison video.
Very comprehensive review.. .quite helpful to have for future reference
Glad you liked it
I recently use VEML6030/VEML7700 ALS sensor with perfect human eye response. Also have a look about VEML6040 RGB sensor. All from Vishay. Nice packaging, but a little bad interface
Thank you for sharing your experience!
Great Work Andreas!
Thanks a lot!
Very usefull these overviews of sensors.
Thank you!
At 10:19 you're talking about the TSL2591 as not recommended, but the red box on the left doesn't include that sensor. Looking at the AMS website, it actually says "Industry leading dynamic range which drives both ultra low light sensitivity and bright sunlight operation" about that sensor.
I just read the content of this website. It is more for professional use in products
This video is right up my alley
Good to know! Thanks.
Yes there is another one which I prefer: The TEMT6000. I also use it to measure sunlight and control my sun roof
Another viewer in the comments below reported that this one maxes out quite early. Do you have a trick?
@@AndreasSpiess yes you are right, I checked my setup (weather station) again and it's an SI1145 which I use outdoor. I use the TEMT6000 as indoor sensor
Greetings Andreas, I am working on a personal research project but because of quarantine I can not buy any precision light measuring sensors and had to use the LDR that I already had at hand, but due to LDR's extreme variance with the change in temperature, it is far from precise, stuck at home and cannot buy anything, so I had to come up with an alternative, so I am using LEDs as a light sensor, I have tested many LEDs and came to a conclusion that the LEDs which light up at least voltage give the best results.
I kindly propose the idea for one of your future videos to analyze and show how feasible it is to use an LED as a light sensor.
Regards,
Tanishq
Tanishq - maybe you are interested in this project - a solar tracker that uses LEDs as the sensor - he has lots of info on his webpage www.redrok.com/led3xassm.htm#led3xc3
@@LarryKapp1 Thank you for sharing this project.
Grüezi from Zurich! I have a project currently based heavily on home sensors for monitoring house plants. Light is obviously an important variable to monitor so have been prototyping with lots of different breakout boards. Currently developing the design on a PCB and I've found that a lot of the lux sensors are hard to source when building yourself. Currently, I'm working with the BH1715 (poor results), VEML6030 (excellent I2C), and the TEMT6000 (analog, quite primitive). Would love to experiment with the UV as this is also an important aspect of plant health so will try to integrate a few extra sensors into the next version!
Good project. A lot to learn, I think.
@@AndreasSpiess So much, always. Just finished up the design this weekend and have the VEML6075 UV sensor onboard :D. Once i'm at a point where it's worth seeing, I'll send you one for your mailbag!
Hope this amount will buy you are beer during your vacation! Enjoy your summer :)
Yes, for sure. Thank you! I too hope you will have a pleasant summer
There has to be this intuitive bond. I am currently working on a project in which I measure the UV-A and UV-B radiation, and if the brightness is exceeded, the shutters on the windows are to be automatically shut down until the UV-A and UV-B levels are again a comfortable level in the room reached. 🤗😘
In my Project I desire to use GY-6075 Light Sensor Modul and BMP280 for Weather Control with a Node MCU ESP32 Dev Board and a 433 MHz RF Transmitter to control the Somfy Window automation.
Thanks for sharing your experience. I try to add aslo a UV sensor to my Lux sensor to compare the readings...
Danke für das wieder sehr informative Video, Andreas es sind die Sätze wie, meine Frau machte Witze über meine Fähigkeiten die mich jedes mal schmunzeln lassen und ich sozusagen eine tiefe Verbundenheit verspüre, mir geht es ja genauso. Oder so Sätze wie in deinem LoRaWAN Video als es darum ging die Pins vom Draginoboard einzutragen "Otherwise you scratch your head an nothing goes" (Video 117) soooooo genial :-) Hey schöne Ostern und bleibt gesund!
Ich bin leider etwas spät für Osterwünsche. Danke! Ja, auf diesem Kanal sind viele ähnlich Interessierte Leute anzutreffen. Ich finde das sehr schön. RUclips sei dank können wir uns so finden und etwas vernünftiges unternehmen...
Could you 'clear' up what is meant by 'clear' on the light sensor? I would think they mean 'white', but that's just a software combination of R, B, and G, so I'm unsure if they might mean something else.
You can see teh curve in the data sheet. It seems to be a widebanc sensor.
The TCS3200 may have use in non digital applications. Life is about change, and, that everything repeats itself. I know, that's odd, but if the digital age ended, (EMP?) you could essentially hook one up to an antiquated panel meter via transistor and smoothing filters.
I am not so sure if it is less prone to EMP. Still some silicone on it ;-)
Good video Andreas. Greetings from Ensenada Mexico
Hello there! Thank you
Ich habe seit mehr als 800 Tagen einen Lichtsensor im Einsatz, der minütlich die Helligkeit misst. Damit kann man eine Steuerung für die Markise bauen. Zu bedenken ist das im Winter die Helligkeit bei voller Sonneneinstrahlung genau so hoch ist wie im Sommer bei starkem Regen. Die Schaltschwelle müsste dazu also dynamisch sein. Bei Bedarf kann ich dir meine 2,5 Jahre Messdaten gerne zukommen lassen.
Sehr Interessant. Weil du soviel Erfahrung hast würde ich dir gerne drei Fragen stellen:
1. Welchen Sensor verwendest du?
2. Wie ist er gegen Wetter geschützt (durchsichtig)
3. Wie hoch ist die höchste Luxzahl die du je gemessen hast? Das würde mir die Dimensionierung erleichtern.
Da ich die Regelung via Node-Red plane kann ich vielleicht das Datum oder die Temperatur meiner Wetterstation in die Berechnung einfügen.
@@AndreasSpiess Hallo Andreas.
1. Ich verwende einen BH1750 der mit einem ESP8266 verbunden ist welcher minütlich seinen Messwert über WLAN an meinen Server schickt.
2. Er ist unter einer Plexikuppel wasserdicht verbaut und verklebt. Die Plexikuppel stammt von einer alten Wetterstation, dort war damals die Solarzelle untergebracht. Der ESP is getrennt (Indoor) verbaut.
3. Maximalwert ist 54612, der reale Wert würde das doppelte überschreiten kann aber nicht mehr gemessen werden.
Da dein geplanter Einsatzzweck eine Markisensteuerung ist würde ich den Wert bei etwa 1500Lux ansetzen wenns zum Beschatten dienen soll. Alles was drunter ist freust du dich eh wennst noch bischen Wärme und Sonne haben kannst :-) Falls ich ein Foto davon finde schicke ich es dir per Mail, meine Messdaten lege ich bei. Liebe Grüße!
Diesen Kommentar hatte ich gar noch nicht gesehen. Also nicht vergessen. Glück gehabt. RUclips macht es schwer, längere Konversationen in den Kommentaren zu führen. Insbesondere wenn man viele kriegt.
For proximity and lux sensors there also is the SI114X series. I'm waiting for an SI1145 which can even approximate the UV Index by combining the IR and Visible Light sensors.
Frohe Ostern
Interesting sensor! Ordered ;-) Thank you
You can get filters for most wavelengths which is handy in some projects to filter out other types of light you are not interested in measuring and which can interfere with your results.
You are right. We live in a very good time.
It is helpful for my quantum photonics research.
Glad to help!
@@AndreasSpiess. God bless Sir.
Welcome to the game of sensors...
:-)
congrats on 200k
Thank you!
great work Andres
Thank you!
Great vid Andreas!
I would really love instructional on how to make a colorimeter with ESP32.
This is a very special area, so the chance I will cover it is small.
@@AndreasSpiess Sad to hear but, thanks for the reply and thanks for your great videos.
Frohe Ostern Andreas!
Danke. Leider bin ich für ein "Ebenfalls" zu spät :-(
really great and extraordinary content ... but have just a view sensors you already mentioned.
Thank you!
Andreas thank you for your vídeo. Excelent. I used APDS 9960 for a project wich needs to get light colour temperature (Kelvin) it is an excelent sensor.
Thank you for sharing your experience!
Happy Easter, Andreas!
Great video!
I wonder wether one of the proximity sensors would be accurate enough to use in a 3D printer for auto bed leveling?
Those are nowhere near accurate enough. You may look at some TOF sensors
D Stanoev thanks for the feedback!
@@maxtester8824 Welcome!
Your awning is to stop it getting too hot. Think infra red. A heat sink with a temp sensor might be easier and more effective! Depends if you want an engineers or a geeks solution!!
Your sensor comparisons are really useful. Stay well.
My wife wants to ahve teh awning out before it get hot ;-)
Andreas Spiess
Let me know what your solution will be. Same problem here😃
Great video! Thank you
You are welcome!
Thank you very much for this video! I found it very useful :)
Glad to hear that!
Gz with 200k subscribers. Go to 500k!
1 million is my next goal ;-)
2:19 - It doesn't have to be specifically R, G and B. You could also measure at Cyan, Magenta and Yellow. Or any other mutually complementary hues. Basically, any three hues that are at 120º from each other on a colour wheel can be used to determine the dominant wavelength.
But, as you know, reading just the wavelength won't allow you to distinguish (for example) red from salmon pink, or yellow from brown, since those differ in brightness and saturation as well. You can calculate those in software if the sensor outputs the three channels (not just its own internal calculation of the wavelength) but, as you mention later in the video, many of those sensors have very irregular overlap between the channels.
You are right. When I was young I worked for a company called Gretag where we developed color meters for the printing industry. But these facts are too complicated for such a short video ;-)
Gretag-Macbeth, later merged into X-Rite? I think I used a couple of their calibrators some 15 or 20 years ago.
Yes. Even before Macbeth...
Isn't Macbeth from the 17th century? ;-)
Actually, I vaguely remember seeing something made by Gretag before the -Macbeth. It wasn't related to printing, though. Maybe light meters or something related with photography? My father used to be a cinematographer (retired now).
ive got an "APDS-9960" but i cannot get it to work... from what ive read its actually only a APDS-9930.. which doesnt have the RGB functionality (what i purchaced it for!)..seems there a few fakes getting about...Thanks Andreas, i know what to look for what purchasing light devices now!
I also found aan APDS9930 during my sensor "reconciliation" . But I did not try it.It is only proximity and ambient light. So probably no fake.
@@AndreasSpiess yes the APDS-9930 is a real component.. i meant the fakes are that the boards are marked and being sold as APDS-9960 even tho its only got the APDS-9930 onboard
Next on MOTION SENSORS... which can be used in day to day life.
Maybe...
Well done. (again) Thanks.
You are welcome!
TINY gloved HAND strikes again 😆
Yes!
Hey Andreas, here is your hand's long lost cousin ruclips.net/video/AJ2nDX05rDY/видео.html
100 different values from IR up to UV-C would be cool
UV-C sensors are very expensive :-(
Frohe Ostern, Andreas!
Danke. Ebenfalls!
Great video, thank you :)
Glad you liked it!
which would be best sensitivity to detect light in bedroom when sleeping from curtain leakage?
ive gone for the Adafruit TSL2591 High Dynamic Range Digital Light Sensor as the Lux range is
from 0.000118 to 88,000
Hello sir, thank you very much for this video, I need advice from you, I need to build a sonometer with decibel and i need a sensor that can give me analog values of sound, can you recommend me a sensors ?? thanks
I do not know, but a quick goolge search showed that microphones or piezo elements are used for this purpose.
Thanks! This video useful for me.I wonder how to create a strobe lux meter
I assume you need a sample and hold circuit used in ADCs to hold the maximum voltage of a sensor.
@@AndreasSpiess Thx
What sensor would you use to detect color or brightness change on a little area (i.e. 1 cm2) on an LCD screen? Sensing speed is important. The faster the better. Color is unimportant, I need to detect if anything changed on the little area being watched or not.
Sensor size is the smaller the better.
I do not know. Maybe you need a lens in addition
@@AndreasSpiess Thank you!
Hi Andreas, great content as usual and very helpful for a project I have always wanted to try: I would like to read the outside color temperature using one of my arduinos, then integrate it via mqtt into my node-red to adapt the Philips Hue Lights in a room with a tiny window to the same color temperature (doing this manually gives a much better perceived light atmosphere, but with changing lights outside (cloudy->sunny->cloudy) this is also irritating). Maybe some expert here has an idea: would it be sufficient to convert RGB values to Kelvin for that matter or would I need other values to analyze light intensity? Congratulatitons on 200k! :)
Interesting project. Color management is not an easy thing because always the whole spectrum is important.. Hopefully you find an expert for that matter
Hi Andreas, nice video like always.
I have a question for you :)
On the ESP32, if someone creates a wifi Network with the same SSID and the ESP32 tries to connect to it, the password that it sends to the router is Encripted? Or the fake Router can know your password in plain text with this kind of attack?
Thank you for your amazing videos.
Thx from Spain ;)
This has nothing to do with ESP32. This is a Wi-Fi security question. ESP32 uses the same technology as your Smarphone etc. So it should be save if your your router setup is ok
It would be very vulnerable if your password were sent in plain text over WiFi so I'm very sure it is encrypted.
The current network encryption (wpa2) is still holding strong and works with your shared network key. If your esp want acess to the network through the access point is requests a random number as a challange and then the esp computes a couple of computaions where the random number the network key and his own mac adress is needed. The esp will send his encrypted random number back to the access point for evaluation and voila if the key was right you are in. Be carful in reality its even more complicated with more numbers and a 4way handshake but you get the point.
average WiFi network is probably more susceptible to bruteforce attacks since people don't bother with long shared keys with enough entropy. Not sure about preventative mechanisms in common standards, though.
I followed your advice on 11:14 .
First I subscribed, then I unsubscribed again at 11:17.
Good advice!
I do not understand, unfortunately :-(
For analysis of food & fruit contents like fat carbohydrates etc which sensor is good for getting the wavelength of 700- 2300nm
I do not know these NIR sensors. I only used IR transistors which work on 900nM. The AS7263 covers 600-900nm for example.
what wavelength laser and what detector would you recommend for an outdoor laser wire during daylight hours?
They usually use IR lasers with filters.
Awesome video keep it up .
Thanks, will do!
Good sharing sir.. appreciate if you can teach us about: 1) how to calibrate with the commercial lux meter. Tq sir
I do not know. But I am sure Google knows. You probably need a particular bulb with a defined spectrum plus a calibrated instrument.