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WiFi round trip time is about 2-50 ms (50 is the worst case), so, you can use the ESP's and the UDP/TCP. On the other hand, you can use the NRF433 module, but in this case, you have to develop your own channel level protocol, with error detection/correction and so on. Also, there are ZigBee module. They developed for home automation specially.


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all of your problem can be solved through a simple trick ... Just follow it... Use Sdfat library insted of SD just follow SPI datasheet.. follow below code ... it works with LORA AND SD both together ... #include <SdFat.h> #include <SPI.h> #include <RHReliableDatagram.h> #include <RH_RF95.h> SdFat sd; SdFile myFile; #define ...


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NRF24L01+ RF 2.4 GHz Transceiver Module


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