Question

我正在尝试使用python中的串行通信与Arduino进行通信。 arduino https://www.arduino.cc/en/Tutorial/ReadASCIIString有这个程序。只需发送“ 120,200,100”即可控制3个LED。当我在python中尝试将数据写入arduino时

arduino.write（b'120,10,244 \ n'）

，并且有效。但是我的主要问题是，如果我将这些值分配给通过GUI进行更改的变量（例如，我计划在其上实现的PyQT滑块），我应该怎么做？

如何输出分配给变量的3个整数->到csv->字节+ \ n

例如

P1 = self.PWM1horizontalSlider.value（）＃假设值为120

P2 = self.PWM2horizontalSlider.value（）＃假定值为200

P3 = self.PWM3horizontalSlider.value（）＃假定值为100

变成b'120,200,100 \ n'

读取ASCII字符串代码

// pins for the LEDs:
const int redPin = 3;
const int greenPin = 5;
const int bluePin = 6;

void setup() {
  // initialize serial:
  Serial.begin(9600);
  // make the pins outputs:
  pinMode(redPin, OUTPUT);
  pinMode(greenPin, OUTPUT);
  pinMode(bluePin, OUTPUT);

}

void loop() {
  // if there's any serial available, read it:
  while (Serial.available() > 0) {

    // look for the next valid integer in the incoming serial stream:
    int red = Serial.parseInt();
    // do it again:
    int green = Serial.parseInt();
    // do it again:
    int blue = Serial.parseInt();

    // look for the newline. That's the end of your sentence:
    if (Serial.read() == '\n') {
      // constrain the values to 0 - 255 and invert
      // if you're using a common-cathode LED, just use "constrain(color, 0, 255);"
      red = 255 - constrain(red, 0, 255);
      green = 255 - constrain(green, 0, 255);
      blue = 255 - constrain(blue, 0, 255);

      // fade the red, green, and blue legs of the LED:
      analogWrite(redPin, red);
      analogWrite(greenPin, green);
      analogWrite(bluePin, blue);

      // print the three numbers in one string as hexadecimal:
      Serial.print(red, HEX);
      Serial.print(green, HEX);
      Serial.println(blue, HEX);
    }
  }
}

Answer 1

要回答您的问题，请在示例之外：

p1 = 120
p2 = 200
p3 = 100

the_bytes = bytes(f'{p1},{p2},{p3}\n', 'utf-8')

这是假设您希望字节使用UTF-8作为编码，这很常见，但是您需要检查一下。也可能是类似cp1252的东西-更多https://docs.python.org/3/library/codecs.html#standard-encodings

然后您可以在需要的任何地方发送the_bytes。

Python 3 CSV整数到字节+ \ n

1 个答案: