Question

如果压力值在一个循环中变化超过一定量，我有此代码可以打开继电器。继电器只有在变为负极时才会继续。这段代码非常粗糙，请原谅我，但有些事情困扰我。有一个是只能满足一次的声明，但即使不满足值，它的内容仍会执行。

检查一下，特别是ldrStartk。

#include <SFE_BMP180.h>
#include <Wire.h>

SFE_BMP180 pressure;

#define ALTITUDE 1667.0

int ldrValue = 0;
int ldrStart = 0;
bool lstate = 0;
int counter = 0;
int sen = 1;
int ddelay = 30;
static int boolS = 0;
int ldrStartk;

void setup() {
  boolS = 1;
  Serial.begin(9600);
  Serial.println("REBOOT");
  // Initialize the sensor (it is important to get calibration values stored on the device).
  if (pressure.begin())
    Serial.println("BMP180 init success");
  else {
    // Oops, something went wrong, this is usually a connection problem,
    // see the comments at the top of this sketch for the proper connections.
    Serial.println("BMP180 init fail\n\n");
    while (1); // Pause forever.
  }
  pinMode(4, OUTPUT);
}

void loop() {
  char status;
  double T, P, p0, a;
  status = pressure.startPressure(3);
  if (status != 0) {
    // Wait for the measurement to complete:
    delay(status);
    status = pressure.getPressure(P, T);
    if (status != 0) {
      // Print out the measurement:
      Serial.print("absolute pressure HPA : ");
      Serial.print(P * 10);
      Serial.print(" hpa, ");
      ldrValue = (P * 10);
      Serial.print("ldrValue");
      Serial.print(ldrValue);
      Serial.print(" boolS:");
      Serial.print(boolS);
      if (boolS = 1) {
        ldrStartk = ldrValue ;
        Serial.print("ldrStartk:");
        Serial.print(ldrStartk);
        delay(200);
      }
      if (ldrValue < ldrStart - sen && counter < ddelay && ldrValue <= ldrStartk + sen) {
        boolS = 2;
        digitalWrite(4, HIGH);
        lstate = 1;
        if (lstate = 1)
          counter = counter + 1;
        if (counter >= ddelay) {
          digitalWrite(4, LOW);
          ldrStart = (ldrValue);
        }
      }
      if (ldrValue >= ldrStart - sen) {
        digitalWrite(4, LOW);
        lstate = 0;
        counter = 0;
        ldrStart = (ldrValue);
      }
      Serial.print(" counter ");
      Serial.print(counter);
      Serial.print(" ldrStart ");
      Serial.println(ldrStart);
      delay(200);
      boolS = 2;
    } else Serial.println("error retrieving pressure measurement\n");
  } else Serial.println("error starting pressure measurement\n");
}

这是监视器：

absolute pressure HPA : 7797.34 hpa, ldrValue7797 boolS:2ldrStartk:7797 counter 0 ldrStart 7797
absolute pressure HPA : 7797.07 hpa, ldrValue7797 boolS:2ldrStartk:7797 counter 0 ldrStart 7797
absolute pressure HPA : 7796.76 hpa, ldrValue7796 boolS:2ldrStartk:7796 counter 0 ldrStart 7796
absolute pressure HPA : 7797.17 hpa, ldrValue7797 boolS:2ldrStartk:7797 counter 0 ldrStart 7797
absolute pressure HPA : 7797.24 hpa, ldrValue7797 boolS:2ldrStartk:7797 counter 0 ldrStart 7797

即使未达到if，也请查看其变化情况。

Answer 1

第72行有错误的代码行。
你正在分配而不是比较。

更改

if (boolS = 1)

到

if (boolS == 1)

同样的情况在第61行：

if (lstate = 1)

应该是

if (lstate == 1)

如果执行即使不满足

1 个答案: