HC -05蓝牙模块总是发送-1

Question

我使用2 HC-05蓝牙模块在2个Arduino Nanos之间进行通信。
我已经将HC-05的波特率设置为9600，一个是主人，另一个为从属。
主始终发送值-1，尽管值应来自模拟输入。
我已经检查了模拟读物，并且值正确。
但是，当我检查蓝牙串行读数时，值为-1。
有人可以帮助我吗？

主代码

#include <SoftwareSerial.h>
SoftwareSerial mySerial(2, 3);
int state = 0;
const int ledPinon = 8;  //the pin your led is connected to
const int ledPin = 7;  //the pin your led is connected to
int xPin = A1;
int xPosition = 0;
int val = 0;
void setup() {
  Serial.begin(9600);
  mySerial.begin(9600);
  pinMode(xPin, INPUT);
  pinMode(ledPin, OUTPUT);
}
void loop() {
  xPosition = analogRead(xPin);
  val = map(xPosition, 0, 1023, 0, 180);
  if (mySerial.available()){
  if (xPosition > 506) {
    digitalWrite(ledPin, HIGH);
    mySerial.write(val);  //sends a 1 through the bluetooth serial link
  }
  else if ((xPosition <506)||(xPosition >502)){
    mySerial.write('0');
    digitalWrite(ledPin, LOW);
  }
  else if (xPosition <502){
    mySerial.write(val);
    backblink();
  }
  int check = mySerial.read();
  Serial.print(val);
  Serial.print("   |    ");
  Serial.println(check);
  delay(200);
}
}
void ledblink(){
  digitalWrite(ledPinon, HIGH);
  delay(200);
  digitalWrite(ledPinon, LOW);
  delay(200);
}
void backblink(){
  digitalWrite(ledPin, HIGH);
  delay(80);
  digitalWrite(ledPin, LOW);
  delay(80);
}

从代码

#include <SoftwareSerial.h>
#include <Servo.h>
SoftwareSerial mySerial(2, 3);
int BluetoothData; // the data given from Computer
Servo ESC;
int state;
const int ledPinon = 8;  //the pin your led is connected to
const int ledPin = 7;  //the pin your led is connected to
const int ledPinback = 6;  //the pin your led is connected to
void setup() {
  // initialize digital pin 8 as an output.
  Serial.begin(9600);
  mySerial.begin(9600);
  pinMode(ledPin, OUTPUT);
  ESC.attach(9);
  ledblink();
}
void loop() {
  Serial.println(state);
  if (mySerial.available()>0) { // Checks whether data is comming from the serial port 
    state = mySerial.read(); // Reads the data from the serial port
    BluetoothData = state;
    ESC.write(BluetoothData);
    Serial.println(state);
  }
  // Controlling the LED
  if (BluetoothData > 90) {
    digitalWrite(ledPin, HIGH); // LED ON
  }
  else{
    digitalWrite(ledPin, LOW); // LED ON
    //backblink(); // LED ON
  }
}
void ledblink(){
  digitalWrite(ledPinon, HIGH);
  delay(200);
  digitalWrite(ledPinon, LOW);
  delay(200);
}
void backblink(){
  digitalWrite(ledPin, HIGH);
  delay(100);
  digitalWrite(ledPin, LOW);
  delay(100);
}

Answer 1

在主代码中，所有可能将任何东西发送到从属的行都位于serial.able.abable。但是，由于从未将任何东西发送给主人，所以总是会返回0。因此主人可能根本没有发送任何东西。