Description: A Wemos Lolin D1 Mini Pro V2 transmits data via Serial Communication to an Arduino Nano which acts as the receiver, reads the data, and then executes the transmitted code which blinks an LED connected to the Arduino Nano.
Notes: Disconnect the TX/RX wires from the microcontollers when uploading code with the Arduino IDE, since the code will not upload properly when the TX or RX pins are connected to any wires during upload.
Supplies:
1 – Breadboard 400 Points
1 – Wemos Lolin D1 Mini Pro V2
1 – Arduino Nano
1 – LED
1 – 220 Ohm Resistor
Arduino Code:
// Transmitter Code
void setup() {
Serial.begin(9600);
delay(100);
}
void loop() {
Serial.print("on");
delay(1000);
Serial.print("off");
delay(1000);
}
— — — — — — — — — — — — — — — — — —
// Receiver Code
String Message;
void setup() {
Serial.begin(9600);
Serial.setTimeout(50); // default is 1 second
delay(100);
pinMode(3, OUTPUT);
}
void loop() {
if (Serial.available()) {
Message = Serial.readString();
}
delay(4);
if (Message == "on") {
digitalWrite(3, HIGH);
}
if (Message == "off") {
digitalWrite(3, LOW);
}
}