New answers tagged wireless
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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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