Following on from my previous post describing my test circuits for an IR tagger system, here’s a schematic of the multiple IR receiver circuit:
4 x IR receivers – TSOP4838
1 x dual 4 input AND gate – cd74hc21e
You’ll notice that The schematic has a 4 input AND gate doing nothing. This is because it was easier for me to get a dual 4 input AND gate than it was to get individual 4 input and gates.
Since these IR receivers have an effective receiving angle of about 90 degrees, 4 units should give a full 360 degree coverage. The active low outputs from the receivers are combined, so that if any of the receivers get all or part of a signal, it will be seen at the output (note: if the receivers get different signals at the same time, it will scramble them together).
I’m putting together a small prototype PCB so that I can just hook this circuit up to the Arduino board as if it were a single IR receiver.