ArduinoA
Arduino•3y ago•
1 reply
Jordan Belfort

Arduino UNO and ESP8266 Serial Communication

This is the code on the ESP8266 side:
void setup() {
  pinMode(LED_BUILTIN, OUTPUT);
  Serial.begin(9600);
}

void blink()
{
  digitalWrite(LED_BUILTIN, HIGH);
  delay(250);
  digitalWrite(LED_BUILTIN, LOW);
  delay(250);
}

void loop() {
  if (Serial.available()){
    Serial.read();
    blink();
  }
}


And this is the code on the Arduino side:
void setup() {
  Serial.begin(9600);
}

void loop() {
  //Serial.write('4');
  Serial.println('4');
  delay(1000);
}


The Arduino is printing the 4's on the ESP serial monitor, but the ESP is not reading them, is like is avoiding all the code and goes straight to the monitor, justs prints there and do nothing.

I'm using Hardware Serial via RX and TX pins, with a level shifter in between. The Arduino is sending the numbers and the ESP is receiving them (but can't interact with them), so is not a wiring issue.
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