ESP32 作为主机和 Arduino 作为从机之间的 UART 连接

Question

Stackoverflow 的公民

我想将按钮值从 ESP32 发送到 Arduino UNO，由于某种原因，Arduino 不会收到从 ESP32 到 Arduino 的值，但值显示在 ESP32 中。 这是程序：

大师 ESP32

const int buttonPin = 15; // push button pin

int buttonState = 0; // button state
int period = 500; // for using delay in output

unsigned long time_now = 0; // delay purposes

char* state = "00" ; // first state

void setup() {
  // put your setup code here, to run once:
  pinMode(buttonPin, INPUT);
  Serial.begin(9600);
  pinMode(13, OUTPUT); // LED PIN for proving purposes
}

void loop() {
  buttonState = digitalRead(buttonPin); // reading push button
  if (buttonState == 1) { // checking push button state
    if (state == "01") { // reading the state now
      state = "00"; // change state to OFF
    }
    else {
      state = "01"; // change state to ON
    }
  }
  while (millis() >= time_now + period) { // serial delay purposes
    time_now += period;
    Serial.write(state);
    int x = atol(state); 
    digitalWrite(13, x); // checking state true or not using LED
  }
  Serial.flush(); // clean buffer
}

从机 Arduino

char data_1; // variable for recieved data

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  pinMode(13, OUTPUT); // LED pin
}

void loop() {
  // put your main code here, to run repeatedly:
  if (Serial.available()) { // checking Serial
    data_1 = Serial.read(); // reading value from ESP
    int x = atol(data_1); // change value to integer 
    digitalWrite(13, x); // proving using LED
    delay(500);
    Serial.flush(); // clean buffer
  }
  else{
    Serial.println("Not Available"); // checking if It's actually sending data
  }
}

正如您在代码中看到的，来自 Arduino 的 output 是“不可用”，而来自 ESP32 的 output 可以很好地触发 LED。 也许有人可以帮我弄清楚？

Answer 1

Stackoverflow 的公民

我想将按钮值从 ESP32 发送到 Arduino UNO，由于某种原因，Arduino 不会收到从 ESP32 到 Arduino 的值，但值显示在 ESP32 中。 这是程序：

大师 ESP32

const int buttonPin = 15; // push button pin

int buttonState = 0; // button state
int period = 500; // for using delay in output

unsigned long time_now = 0; // delay purposes

char* state = "00" ; // first state

void setup() {
  // put your setup code here, to run once:
  pinMode(buttonPin, INPUT);
  Serial.begin(9600);
  pinMode(13, OUTPUT); // LED PIN for proving purposes
}

void loop() {
  buttonState = digitalRead(buttonPin); // reading push button
  if (buttonState == 1) { // checking push button state
    if (state == "01") { // reading the state now
      state = "00"; // change state to OFF
    }
    else {
      state = "01"; // change state to ON
    }
  }
  while (millis() >= time_now + period) { // serial delay purposes
    time_now += period;
    Serial.write(state);
    int x = atol(state); 
    digitalWrite(13, x); // checking state true or not using LED
  }
  Serial.flush(); // clean buffer
}

从机 Arduino

char data_1; // variable for recieved data

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  pinMode(13, OUTPUT); // LED pin
}

void loop() {
  // put your main code here, to run repeatedly:
  if (Serial.available()) { // checking Serial
    data_1 = Serial.read(); // reading value from ESP
    int x = atol(data_1); // change value to integer 
    digitalWrite(13, x); // proving using LED
    delay(500);
    Serial.flush(); // clean buffer
  }
  else{
    Serial.println("Not Available"); // checking if It's actually sending data
  }
}

正如您在代码中看到的，来自 Arduino 的 output 是“不可用”，而来自 ESP32 的 output 可以很好地触发 LED。 也许有人可以帮我弄清楚？