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Radio control

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I am looking for a scheme for transmitting signals over the air from three sensors to an indicator. With the possibility of simultaneously triggering two of them. Working conditions from +30 to -30 degrees.
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The question is about nothing:
1. What sensors - relay, analog? It can be assumed that at least two of them are relay, but not a fact, since signal processing at the receiving side is possible.
2. The distance from the sensors to the indicator?
3. Are all sensors in one place or in different?
4. What kind of power exists on the transmitting and receiving sides? Consumption requirements?
5. "Operating conditions from +30 to -30 degrees" - refers to the transmitter and receiver? The range itself is rather doubtful: if there is minus 30, then the plus should be above 30.

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