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Lesson 34: Using MCP9808 High Accuracy I2C Temperature with TM1637 LED Display| 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 TM1637 LED Display. We have no decimal point with this display. There are two other video lectures for this sensor 1-Introduction to MCP9808 and 1-Using MCP9808 with LCD screen.

 * Robojax Arduino Step By Step Course
 * Part 3: Temperature Sensors
 * Lesson 34: MCP9808 with TM1637 LED Display

 * Updated by Ahmad Shamshiri for Robojax
 * on Mar 23, 2019 in Ajax, Ontario, Canada

  Please watch video instruction here
 This code is available at
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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 <math.h>
#include <Wire.h>
#include "Adafruit_MCP9808.h"

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

// start of settings of TM1637 display
#include <Arduino.h>
#include <TM1637Display.h>

// Module connection pins (Digital Pins)
#define CLK 5
#define DIO 6
TM1637Display display(CLK, DIO);
// start of settings of TM1637 display

uint8_t blank[] = { 0x0, 0x0, 0x0, 0x0 };// blank value for all digits

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 
 * 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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