Controlling 4 devices using an RF remote is very easy with this project. This is an
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Create a Two-Channel Remote Control with the nRF24L01+ - Projects
Create a Two-Channel Remote Control with the nRF24L01+ - Projects
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Create a Two-Channel Remote Control with the nRF24L01+ - Projects
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4 Channel RF Remote Transmitter using nRF24L01- Arduino Compatible