I am trying to use an LED (or CMOS RGB) sensor to determine if a red LED is illuminated. My idea is to use a red dichroic filter to block out as much ambient light and use an analog port on a microcontroller set at a threshold. I need this to work at ~6 inches away.
I have used a red camera lens (which I don't believe is the same as a dichroic) and detected the change between on and off with a blinking LED, but there really isn't enough filtering occurring to see a steadily lit LED.
Any optics people in the group think the dichroic will improve the results?
I have used a red camera lens (which I don't believe is the same as a dichroic) and detected the change between on and off with a blinking LED, but there really isn't enough filtering occurring to see a steadily lit LED.
Any optics people in the group think the dichroic will improve the results?