PT100/PT1000 工业级温度传感器

2 ESP8266 ADC

硬件连接：

 VCC33 ---> PT1000 <-- (A0) --> 300R 1% ---> GND

void setup()
{
  Serial.begin(115200);
}

void loop() {
  int vd = analogRead(A0);
  Serial.print("vd = ");
  Serial.println(vd);

  uint32_t rtd = (1024 - vd) * 300 / vd;
  Serial.print("rtd = ");
  Serial.println(rtd);

  delay(1000);
}

3 MCP3421

快速测试：

#include <Wire.h>
#define MCP3421_ADDRESS 0X68

void setup()
{
  Serial.begin(115200);  
  Wire.begin();
}

void loop()
{
  Wire.requestFrom(MCP3421_ADDRESS, 4);
  if (Wire.available() != 4) {
    Serial.println("Wire.available failed");
    while(1);
  }
  int16_t v = (Wire.read() << 8);
  v |= Wire.read();
  // read but ignore status
  uint8_t s = Wire.read();
  //print voltage from channel one in millivolts
  Serial.print(v);Serial.println(" mv");
  delay(1500);
}

改进：

4 资源

• http://martin.engineer/wp/?p=453

• http://openenergymonitor.org/emon/buildingblocks/rtd-temperature-sensing
• http://forum.arduino.cc/index.php?topic=16731.0
• http://stackoverflow.com/questions/21644642/how-to-connect-pt-1000
• http://41j.com/blog/2015/01/esp8266-analogue-input/