Example Code for Arduino-Get Temperature

Hardware Preparation

• DFRduino UNO R3 x 1
• MCP9808 High Accuracy Digital Temperature Sensor x 1
• Jumper wires

Software Preparation

• Arduino IDE
• Download and install the MCP9808 Library and Sample Program. (About how to install the library?)

Wiring Diagram

Other Preparation Work

1. Connect the sensor to the Arduino as per the wiring diagram.
2. Open Arduino IDE and load the sample code.
3. Select the correct board and port in Arduino IDE.

Sample Code

/*!
 * @file getTemperature.ino
 * @brief The example of obtaining temp normally
 * @details Experimental phenomenon: display the temp on the serial port, the measured temp varies with ambient temp
 * @copyright Copyright (c) 2010 DFRobot Co.Ltd (http://www.dfrobot.com)
 * @license The MIT License (MIT)
 * @author ZhixinLiu([email protected])
 * @version V1.0
 * @date 2021-04-16
 * @url https://github.com/DFRobot/DFRobot_MCP9808
 */
#include "DFRobot_MCP9808.h"

/**
 * i2c address select, default to be MCP9808_ADDRESS_7, pin A2, A1 and A0 is at high level
 *    1 for high level, 0 for low level,  | A2 | A1 | A0 |
 *    MCP9808_ADDRESS_0        | 0  | 0  | 0  |    0x18
 *    MCP9808_ADDRESS_1        | 0  | 0  | 1  |    0x19
 *    MCP9808_ADDRESS_2        | 0  | 1  | 0  |    0x1A
 *    MCP9808_ADDRESS_3        | 0  | 1  | 1  |    0x1B
 *    MCP9808_ADDRESS_4        | 1  | 0  | 0  |    0x1D
 *    MCP9808_ADDRESS_5        | 1  | 0  | 1  |    0x1D
 *    MCP9808_ADDRESS_6        | 1  | 1  | 0  |    0x1E
 *    MCP9808_ADDRESS_7        | 1  | 1  | 1  |    0x1F
 */
#define I2C_ADDRESS  MCP9808_ADDRESS_7
DFRobot_MCP9808_I2C mcp9808(&Wire, I2C_ADDRESS);

void setup()
{
  Serial.begin(115200);
  while(!Serial);
  while(!mcp9808.begin()){
    Serial.println("begin failed!");
    delay(1000);
  } Serial.println("begin success!");

  /**
   * Wake up sensor, sensor data can be obtained normally at this time
   */
  if(!mcp9808.wakeUpMode()){
    Serial.println("Register locked, Please unlock!");
  }else{
    Serial.println("Wake up sensor successfully, can read the temperature!");
  }

  /**
   * Set temp resolution
   *  RESOLUTION_0_5      The decimal part of the obtained temp is a multiple of 0.5     e.g. 0.5°C, 1.0°C, 1.5°C
   *  RESOLUTION_0_25     The decimal part of the obtained temp is a multiple of 0.25    e.g. 0.25°C, 0.50°C, 0.75°C
   *  RESOLUTION_0_125    The decimal part of the obtained temp is a multiple of 0.125   e.g. 0.125°C, 0.250°C, 0.375°C
   *  RESOLUTION_0_0625   The decimal part of the obtained temp is a multiple of 0.0625  e.g. 0.0625°C, 0.1250°C, 0.1875°C
   */
  if(mcp9808.setResolution(RESOLUTION_0_125)){
    Serial.println("Set temp resolution successfully!");
  }else{
    Serial.println("parameter error!");
  }
}

void loop()
{
  Serial.print("Temperature is ="); 
  Serial.print(mcp9808.getTemperature());
  Serial.println(" C");
  delay(1000);
}

Result

Serial print the obtained temp and humidity data.