QTR 15HD vs QTRX 15HD
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- Опубликовано: 15 мар 2020
- In this video I compare a QTR-15HD with a QTRX-15HD but only looking at the readings with respect to distance. I wanted to know if the specs on the website were accurate because they claimed the sensors could be used up to 50mm away. That's nearly two whole inches!
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There aren't much videos on the new QTRX sensors. Got some insight after seeing this one. Great video.
Good to see you again. Welcome back...
Thanks, sorry it's kind of a bum video but it's been so long without one I wanted to post something. I've been super busy with my two jobs and now the corona virus going around. I hope everyone is staying safe.
from where we can get QTR MD 8A library
What board / microcontroller are you using to process the sensor data ?
I'm using a Teensy 3.5
Is there a way to skip the calibration step every time the power is on and off?
There is, the library (my version) has four arrays that hold the minimum and maximum readings for each sensor. (calibratedMinimumOn, calibratedMaximumOn, calibratedMinimumOff, and calibratedMaximumOff).
The latest version of the pololu QTR library also has some values exposed so you can set them directly which are held in a struct called "CalibrationData".
I cannot easily give an example through a youtube comment but if you need some help you can contact me through robotresearchlab.com/contact-me/, just be sure to use your real email so I can respond to you directly.
Which is better
RC (resistor capacitors) eg. Pololu 8RC
Or
RR (resistor resistor) eg. Pololu 8 A
There really is no clear cut answer, it depends mostly on two things, I go into much greater detail in this article robotresearchlab.com/2019/03/06/pololu-qtr-8rc-vs-qtr-8a-sensor-array/
1. How fast is your processor?
2. How many analog/digital pins do you have available?
If you're using a slow processor like Arduino Uno or Nano (any using the ATMega328) then you'd be better off using digital with a timeout of about 1000us. The problem with Uno and Nano is they only have so many pins so you may not have enough available depending on other parts in your circuit. However, if you're using a fast processor (like a Teensy 3.x or 4.x) then you're definitely better off using analog as they're many times faster since the digital array is always going to be possibly as slow as whatever the timeout value is. Meaning, if your timeout is 3000us, your results could take the whole 3000us.
Can you please tell me can we use resistor - capacitors timeout logic for TCRT 5000 IR sensors
Please tell me any metod of finding capacitors resistor value and time required per sensors reading
Calculation formula or pdf for same
I would recommend just hooking them up to the Analog pins on the arduino and using the QTR library for analog, I wouldn't know what RC values to use for your sensors to be compatible with the QTR library. Just use the resistors called for in the datasheet or an example online, it looks like something around 100-200 ohm would work. They don't have to be the QTR sensors or even Pololu brand for that matter. The library will work with any analog sensor or array of sensors. I hope that helps, let me know if not, I'll see what else I can come up with.
@@RobotResearchLab
Yes I will definitely try and give you feedback
Thank you so much
Can you please share circuit diagram links of both QTR and qtrx
These can all be found on Pololu's website, for example, here is the circuit diagram for the QTRX-HD-RC www.pololu.com/product/4301/specs#lightbox-picture0J8950;main-pictures
And here is the circuit diagram for the QTRX-HD-A (analog) www.pololu.com/product/4201#lightbox-picture0J8950;main-pictures
@@RobotResearchLab
Thank you so much
Great help
Please tell me model number of pololu qtrx sensor ( lensed sensor)
Like normal qtr sensor is QRE 1113
Honestly, I have no idea. I know the normal (unlensed) ones are QRE1113 as you mentioned but I'm not sure about the new lensed version. You could try contacting Pololu or some other company that makes the QTRX style boards and see if they'll give you the part number. Sorry I can't help much more than that.
@@RobotResearchLab
Okay
Thank you sir
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