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1. The transmitters are directional. You will need to have receptors in several locations.
2. The outputs yes/no of each unit have to be encoded differently so they are not counted twice.
3. The receptors can only handle one signal at a time. This leads to two things.
a. They have to be duty cycled to give time for the other transmissions.
b. It is important to have narrow beams so only one receptor gets the signal. There has to be decoding at the receptor.
4. The main computer needs to keep track of which transmissions never reach it.
This leads to the probability of radio links being better. There can be several frequencies. The receptor can transmit out a command for the senders that are received to stop transmitting. This makes sure all of the senders get counted.
After thinking more about it, you could have the radio reverse link on the ir system. It could turn on groups of transmitters and after receiving each one turn it off and then turn the next group on. This will solve the collision problem.
Anther way is to poll the senders to turn on the IR transmitters and then off.
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