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- String Serial_String = "";
- // Initial setup
- void setup() {
- Serial.begin(9600); // Initialize the debug serial port
- /*
- * It is recommended to use the lower baud rate. The higher the baud rate,
- * the higher the bit error rate will be, and the control action might fail.
- */
- Serial3.begin(4800); // Initialize the ESP8266 <=> MEGA2560 serial port
- pinMode(LED_BUILTIN, OUTPUT); // Initialize the digital pin LED_BUILTIN as an output
- }
- // Read a command from ESP8266 over serial
- void read_string() {
- while (Serial3.available() > 0) {
- Serial_String += (char)(Serial3.read());
- delay(2);
- }
- }
- // The loop function runs over and over again forever
- void loop() {
- if (Serial3.available() > 0) {
- Serial_String = "";
- read_string();
- Serial.println(Serial_String);
- }
- if (Serial_String == "1")
- digitalWrite(LED_BUILTIN, HIGH); // turn the LED on (HIGH is the voltage level)
- if (Serial_String == "0")
- digitalWrite(LED_BUILTIN, LOW); // turn the LED off by making the voltage LOW
- }
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