0值整数不输入If [英] 0 value integer does not enter If

问题描述

我确定这是一个非常基本的编码错误...

I'm sure this is a very basic coding mistake...

我从A0读取数据。如果值为0，我希望将串行的值写入串行监视器。

I'm picking up a reading from A0. If the value is 0, I want the value of the serial to be written to the Serial Monitor.

我还希望它只是第一次写入串行监视器该值降至0.

I also want it only to write to the Serial Monitor for the first time that the value falls to 0.

我不明白为什么，当SensorValue的值= 0时，不执行if。

I don't understand why, when the value for SensorValue = 0, the if is not performed.

这是我的代码：

This is my code:

boolean must_print = true;
int sensorValue = 0;

// the setup routine runs once when you press reset:
void setup() {
// initialize serial communication at 9600 bits per second:
  Serial.begin(9600);
}

// the loop routine runs over and over again forever:
void loop() {
  // read the input on analog pin 0:
  sensorValue = analogRead(A0);

  if (sensorValue = 0) {

     if (must_print = true)
    {
     must_print = false;
     Serial.println(sensorValue);
    }
  else
    must_print = true
  }


   delay(500);        // delay in between reads for stability
}

谢谢！

Thanks!

推荐答案

这不是Arduino论坛但是

This is not an Arduino forum but

您需要使用==，而不是= 

you need to use ==, not = 

https://en.wikipedia.org/wiki / C_（programming_language）#operators 

https://en.wikipedia.org/wiki/C_(programming_language)#Operators 

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