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Lesson 32: MCP9808 High Accuracy I2C Temperature Custom Code | Arduino Step by Step Course

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Part 3: Temperature Sensors

In this lesson we learn how to use MCP9808 Temperature sensor to measure and display it on Arduino IDE serial monitor and take action based on value of temperature. There are two other videos and code for LCD and LED display.

 * Robojax Arduino Step By Step Course
 * Part 3: Temperature Sensors
 * Lesson 32 MCP9808 Custom function
 * Updated by Ahmad Shamshiri for Robojax
 * Feb 23, 2019 in Ajax, Ontario, Canada
  Please watch video instruction here
 This code is available at
with over 100 lectures Free On  YouTube Watch it here
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 * Code is available at

 * This code is "AS IS" without warranty or liability. Free to be used as long as you keep this note intact.* 
 * This code has been download from
    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <>. 

This is a demo for the Adafruit MCP9808 breakout
Adafruit invests time and resources providing this open source code,
please support Adafruit and open-source hardware by purchasing
products from Adafruit!

#include <Wire.h>
#include "Adafruit_MCP9808.h"

// Create the MCP9808 temperature sensor object
Adafruit_MCP9808 tempsensor = Adafruit_MCP9808();

void setup() {
	//YouTube Watch it here
  Serial.println("MCP9808 demo by Robojax");
  // Make sure the sensor is found, you can also pass in a different i2c
  // address with tempsensor.begin(0x19) for example
  if (!tempsensor.begin()) {
    Serial.println("Couldn't find MCP9808!");
    while (1);

void loop() {
  //Serial.println("wake up MCP9808.... "); // wake up MCP9808 - power consumption ~200 mikro Ampere
  //tempsensor.wake();   // wake up, ready to read!

  // Robojax example 
  Serial.print(getTemp('C'));// print Temperature in Celsius
        Serial.println(" C");// print C 
  Serial.print(getTemp('F'));// print Temperature in Celsius
        Serial.println(" F");// print F   
  Serial.print(getTemp('K'));// print Temperature in Kelvin
        Serial.println(" K");// print K  
  //Serial.println("Shutdown MCP9808.... ");
  //tempsensor.shutdown(); // shutdown MCP9808 - power consumption ~0.1 micro Ampere
  //YouTube Watch it here

 * Written by Ahmad Shamshiri  for
 * Jan 22, 2019 in Ajax, Ontario, Canada
 * getTemp(char type)
 * returns temperature in either C, F or K
 * @param type is character of upper case 
 * C is used to get Celsius
 * F is used to get fahrenheit
 * K is used for Kelvin
float getTemp(char type) {
	//YouTube Watch it here
    float c = tempsensor.readTempC();//get main temperature in C
  float f = c * 9.0 / 5.0 + 32;// convert to fahrenheit
  if(type =='F')
    return f;// fahrenheit
  }else if(type =='K')
    return c + 274.15;// return Kelvin
   return c; //return Celsius
}//getTemp ends


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