MAX31855热电偶故障

Question

我从adafruit运行MAX31855热电偶示例中得到了这个例子。但我得到的结果低于。它在我的代码上有问题，或者在设置设备上有问题。

请帮帮忙！我花了很长时间去谷歌，但找不到结果。

Internal Temp = 0.00
C = 0.00
F = 32.00
Internal Temp = 0.00
C = 0.00
F = 32.00
Internal Temp = 0.00
C = 0.00
F = 32.00
Internal Temp = 0.00
C = 0.00
F = 32.00

Here is the code

/*************************************************** 
  This is an example for the Adafruit Thermocouple Sensor w/MAX31855K

  Designed specifically to work with the Adafruit Thermocouple Sensor
  ----> https://www.adafruit.com/products/269

  These displays use SPI to communicate, 3 pins are required to  
  interface
  Adafruit invests time and resources providing this open source code, 
  please support Adafruit and open-source hardware by purchasing 
  products from Adafruit!

  Written by Limor Fried/Ladyada for Adafruit Industries.  
  BSD license, all text above must be included in any redistribution
 ****************************************************/

    #include <Adafruit_MAX31855.h>

    int thermoDO = 3;
    int thermoCS = 4;
    int thermoCLK = 5;

    Adafruit_MAX31855 thermocouple(thermoCLK, thermoCS, thermoDO);

    void setup() {
      Serial.begin(9600);

      Serial.println("MAX31855 test");
      // wait for MAX chip to stabilize
      delay(500);
    }

    void loop() {
      // basic readout test, just print the current temp
       Serial.print("Internal Temp = ");
       Serial.println(thermocouple.readInternal());

       double c = thermocouple.readCelsius();
       if (isnan(c)) {
         Serial.println("Something wrong with thermocouple!");
       } else {
         Serial.print("C = "); 
         Serial.println(c);
       }
       Serial.print("F = ");
       Serial.println(thermocouple.readFarenheit());



delay(1000);
}

Answer 1

只是一些想法，显然这不是在您的房间冻结，但热电偶确实返回正确的关系0C和32F，没有任何数据转换的部分。

那么，热电偶是否有一个物理参考点或连接点，必须与热电偶装置本身连接在一起？

文档是否说，当出现某种类型的错误时，它总是返回0C/32F？

最后，您的SPI引脚正确吗？记住，对于SPI，Arduino上有一些特定的引脚，您使用这些引脚吗？