SparkFun Infrared Sensor Overview
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- Опубликовано: 10 сен 2024
- Products Featured in this Video:
Infrared Emitters and Detectors: www.sparkfun.c...
Infrared is an easy way to add object avoidance to a robot for things like autonomous object avoidance.
Tags: HowTo
Talent: Jeff Branson
FWIW, cellphone cameras do not (typically?) have polarizing filters, and polarization is not why you are able to see the IR on the camera. Silicon photodiodes as used in image sensors are sensitive to IR. The fancy camera almost surely has an IR-blocking filter. The sunglasses likely just decreased the light, increasing exposure to where the IR became visible in spite of the filter.
Semi-related: IR photography is pretty neat, and the IR filter is why it's difficult with a DSLR.
Well, resistors limit current, and a voltage divider kind of routes that current so that the output's voltage is variable. If the resistor next to ground is high, more voltage goes through the Arduino's pin. An Arduino does not read current, but actually voltage, so a voltage divider is needed to read from sensors that work via variable resistance. One resistor would return 5V (1024ish) no matter what.
Hello,
How would you suggest to use them in a scenario where emitter "shoots" and if transmitter is "hit" then it should be obvious to notice it?
I've read that if you pwm the ir led at a certain frequency, it helps reduce the noise of ambient light
for gud range (1 m) whch one should i buy ...can u suggest me few names ..
There is no purple light for me. Can anyone help?
Isn't the orientation of the photodiode at 2:42 backwards in the diagram? As I recall photodiodes always pass current forwards, but reverse only in the presence of light.
I've been working on a project using an IR signal bounced off the side of a wheel to detect when the wheel turns... I painted black and white bands on the wheel to change the reflectivity. I think it's working but I'm afraid that it won't be reliable. It's kind of my first project with photodiodes.
Hy anyone to help?I need to use my arduino line following robot to be able to locate different rooms,in a simple way .
There are places you can send your dSLR off to and have them replace the "hot mirror" filter in front of the sensor with a filter that blocks visible light but allows IR.
Can anyone tell me why a 10K resistor is used for the IR receiver read? The 330ohm resistor on the emitter makes sense to me but what information would lead you to know to use a 10K resistor for the reading process? (i'm learning thanks!)
how far can i put the emitter and reciever apart?
Well, "built correctly" is the real question, isn't it? :) I've never made such a thing before... And it's a gift so if something goes wrong I won't be able to just fix it... The wheel in this case can shift around a bit, too, and I worry that could change the reading... Mostly, though, it's just lack of confidence...
First thing I thought, too! :D
Nicholas Cage's geeky identical twin
I wish he had dreadlocks. That would be cool.
nice laptop