Read color of a LED?
-
I can't do that. They have the whole board in plastic and its not the actual LED i can see just the plastic attatchment that is placed on the led
MySensors MQTT Client Gateway, Openhab, Dashing, Razberry, 1-wire
-
I can't do that. They have the whole board in plastic and its not the actual LED i can see just the plastic attatchment that is placed on the led
-
COuld you perhaps just use an LDR - i would presume the RED light emitted is at a different level to that of the GREEN light emitted and thus just MAP the range you would expect each to be at.
You would need to handle ( block out ) any ambient light however...and then you wont be able to see the led anymore...
-
@Martin-Tellblom well, then maybe the color sensor is an option?
-
@Yveaux But the once I have seen uses light to measure the color. Will that work on a LED?
I thought that i wouldn't work if you "light a light"@Martin-Tellblom The sensor used (TCS3200) converts colored light to a frequency.
I assume the breakout boards contain leds is to be able to determine the color of objects, by lighting them using the white leds on the board.
Presonally I don't have any experience with these sensors, but for less than $3 I would just give it a try!http://yveaux.blogspot.nl
-
@Martin-Tellblom The sensor used (TCS3200) converts colored light to a frequency.
I assume the breakout boards contain leds is to be able to determine the color of objects, by lighting them using the white leds on the board.
Presonally I don't have any experience with these sensors, but for less than $3 I would just give it a try!@Yveaux said:
@Martin-Tellblom The sensor used (TCS3200) converts colored light to a frequency.
I assume the breakout boards contain leds is to be able to determine the color of objects, by lighting them using the white leds on the board.
Presonally I don't have any experience with these sensors, but for less than $3 I would just give it a try!I'll try that and desolder the leds :)
Thank you
-
Use this sensor S9706
https://github.com/jakalada/Arduino-S9706 -
COuld you perhaps just use an LDR - i would presume the RED light emitted is at a different level to that of the GREEN light emitted and thus just MAP the range you would expect each to be at.
You would need to handle ( block out ) any ambient light however...and then you wont be able to see the led anymore...
@gregl I like this idea. Have you tried it out? Just put one of these ( http://www.ebay.de/itm/20Stks-GL5528-Photoresistor-LDR-Photo-Resistors-Light-Dependen-t-/272304382916?hash=item3f669b23c4:g:4XkAAOSw7XZXg-Iu ) over your led and see if you get different readings depending on the color. I would guess that red and green emitt different light intensities like gregl suggested. To block out ambient light you could use some black tape and punch just 2 little holes for the wires of the LDR.
-
Many things to try now :) I have ordered a couple of different solutions and will get back when they have arrived and I tried them.
-
If you are open for some expriments:
http://www.instructables.com/id/LEDs-as-light-sensors/
This might even be double usefull as different LED-Colors as "light sensor" would react different.
e.g. for your red/green led .. if you pick a red led as "light sensor" you might get a much stronger reading then from the green led and hopefully a distinctive zero reading if none of them is on.
