Hello everyone,
I want to communicate with my robot via IR, but im having trouble with the
recieving hardware. My first idea was to simply use a phototransistor to
output a voltage relative to the light level, and capacitatively couple
this to an op-amp wired as a comparator. This turned out to be too
insensitive, (maximum range was less than a foot). I do not want to use
the 40KHz modulated sharp modules, as they are too expensive. preferably
the hardware would involve an op-amp, a phototransistor and a few passive
compnents. anyone have any ideas? thanks.

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