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I would like to control multiple RF receivers to turn on/off LED. Can you please let me know is there any cheap generic RF transmitter and multiple receivers to achieve this using raspberry pi?

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Search Amazon or Google for nRF24L01+ 2.4GHz Wireless Transceiver - There are plenty of tutorials online. I have used this to communicate between arduinos and my Pi

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you could use rf24 transievers. There are fairly cheap. If I recall they where about 7.00 for both of them. There are other places that sell them cheaper.

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