In my first post i wrote that I have ESP8266 relay module in which ESP01 communicates with relay board in serial sending TX command and this code work as espected that is it turn on and of my relay:
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byte relON[] = {0xA0, 0x01, 0x01, 0xA2}; //Hex command to send to serial for open relay
byte relOFF[] = {0xA0, 0x01, 0x00, 0xA1}; //Hex command to send to serial for close relay
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Serial.write(relON, sizeof(relON)); // turns the relay ON
Serial.write(relOFF, sizeof(relOFF)); // turns the relay OFF
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Using Blynk these lines of code do not turn on or off relay…