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Originally Posted by Marc P.
I believe the IR recievers are setup to output a low voltage as positive confirmation of a signal. This means with no IR signal, it will output 5 volts. When there is and IR signal, it will output a lower voltage (ideally 3.3v I believe, as per the spec sheet of these sensors).
If your sensors are outputting a lower voltage with no signal, it could mean a number of things- damaged recievers, IR noise/reflection, unstable input voltage, or something of the like.
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Actually the spec sheet says that the maximum output voltage when it sees a signal is 250mv.
That being said, if you are just using a simply volt meter, you will most likely not see anything near 0v, but some other voltage (Possibly around 4.5v for the type 0 beacon since it is only on for 10% of the time. Beacon 1 would be slightly slighty lower, say 4v due to it's 20% duty cycle)) Exactly what may vary from that though, depending on your meter.