求教如何将传感器读取的数据存入String中

答案:2 悬赏:40 手机版

解决时间 2021-02-01 13:38

提问者网友：蓝琪梦莎
2021-02-01 03:35

最佳答案

五星知识达人网友：底特律间谍
2021-02-01 04:46

#define DHT22_PIN 3
uint8_t deg[8]  = {0x6,0x9,0x9,0x6};
#define         MG_PIN                       (0)
#define         BOOL_PIN                     (2)
#define         DC_GAIN                      (8.5)
#define         READ_SAMPLE_INTERVAL         (50)
#define         READ_SAMPLE_TIMES            (5)
#define         ZERO_POINT_VOLTAGE           (0.220)
#define         REACTION_VOLTGAE             (0.020)
#include
#include
#include
#include
LiquidCrystal_I2C lcd(0x27,20,4);
DHT22 myDHT22(DHT22_PIN);
float           CO2Curve[3]  =  {2.602,ZERO_POINT_VOLTAGE,(REACTION_VOLTGAE/(2.602-3))};
String data=" ";
String Co2="";
String Temp="";
String Hem="";
void setup()
{
  Serial.begin(9600);
  pinMode(BOOL_PIN, INPUT);
  digitalWrite(BOOL_PIN, HIGH);
  lcd.init();
  lcd.backlight();
  lcd.createChar(0, deg);
}

void loop()
{ int percentage;
  float volts;

  volts = MGRead(MG_PIN);
  percentage = MGGetPercentage(volts,CO2Curve);
  if (percentage == -1) {
        String Co2 = "<400" ;
    } else {
        String Co2 =String(percentage,DEC);
    }
  DHT22_ERROR_t errorCode;
  errorCode = myDHT22.readData();
  if(errorCode == DHT_ERROR_NONE)
  { String Temp = String (myDHT22.getTemperatureC(),DEC);
    String Hem  = String (myDHT22.getHumidity(),DEC);
  }
  Serial.println(Co2);
  Serial.println(Temp);
  Serial.println(Hem);
  String Co2="";
  String Temp="";
  String Hem="";
  delay(1000);

}
float MGRead(int mg_pin)
{
    int i;
    float v=0;

    for (i=0;i         v += analogRead(mg_pin);
        delay(READ_SAMPLE_INTERVAL);
    }
    v = (v/READ_SAMPLE_TIMES) *5/1024 ;
    return v;
}
int  MGGetPercentage(float volts, float *pcurve)
{
   if ((volts/DC_GAIN )>=ZERO_POINT_VOLTAGE) {
      return -1;
   } else {
      return pow(10, ((volts/DC_GAIN)-pcurve[1])/pcurve[2]+pcurve[0]);
   }
}

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1楼网友：人類模型
2021-02-01 05:46

期待看到有用的回答！

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