I've been asked to help someone who's working on a program to re-introduce red squirrels into areas of the UK.
I'm looking at the feasibility of designing a squirrel trap that will trap and hold grey squirrels, but release red squirrels. To do this I need to be able to detect the colour of the animal entering the trap.
Sparkfun sell several colour sensors.... https://www.sparkfun.com/products/11195 https://www.sparkfun.com/products/10656 https://www.sparkfun.com/products/10701 https://www.sparkfun.com/products/10904
My current idea is to mount a colour sensor on the side of the entrance hole - as the animal enters the trap the sensor gets triggered and if it detects red fur nothing happens, but if it detects grey then the door snaps shut.
Has anyone any experience of using any of the above sensors - they seem to vary greatly in price, but what about performance? how sensitive are they to ambient light? will I get similar performance at dawn and dusk as well as midday? I'm not looking for 100% accuracy, the idea is that the trap would be checked frequently, so even if a red one gets shut in by mistake it can be released later - but I am looking for at least 80% accuracy.
Any suggestions? - particularly from anyone who's used any of these sensors.