 void setupRadio() {
   radio.begin();
   radio.setChannel(1);
-  radio.setPALevel(RF24_PA_HIGH);
+  radio.setPALevel(RF24_PA_LOW); // Set Power Amplifier (PA) level to one of four levels: RF24_PA_MIN, RF24_PA_LOW, RF24_PA_HIGH and RF24_PA_MAX
   radio.setDataRate(RF24_250KBPS);
   radio.setAutoAck(true);                  // Ensure autoACK is enabled
   radio.enableAckPayload();

    }
  }

  // if the transmission was not confirmed after > 150ms...
  if (millis() - previousSuccessfulTransmission > 150) {
    greenLED.on();
    transmissionState = false;
    memset(&payload, 0, sizeof(payload)); // clear the payload array, if transmission error

    drawDisplay();
  }

  // Right button S3: Change transmission mode. Radio <> IR
  if (DRE(digitalRead(BUTTON_RIGHT), rightButtonState)) {
    IrMode = !IrMode;
    drawDisplay();
