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Radio signaling
33 USD Write sketches for esp32-c6 super mini boards, receiver, transmitter, using the esp-now protocol. The transmitter sends information about the power level and contact status once every 3 seconds. If the power and contact are normal, a green LED lights up on the receiver; if the power is poor - yellow; if there is no signal or the contact is triggered - red. The devices should only work in pairs and not respond to similar ones within the network range.
Kherson