Introduction: Particle Photon - TMP100 Temperature Sensor Tutorial

About: We are a group of makers. We work in IoT, IOS app, android app, embedded design, sensor design, raspberry pi, arduino, beaglebone, particle electron, particle photon, Bluetooth.

TMP100 High-Accuracy, Low-Power, Digital Temperature Sensor I2C MINI module. The TMP100 is ideal for extended temperature measurement. This device offers an accuracy of ±1°C without requiring calibration or external component signal conditioning. Here is the demonstration with Particle photon.

Step 1: What You Need..!!

Step 2: Connection:

Take an I2C shield for particle photon and gently push it over the pins of particle photon.

Then connect the one end of I2C cable to TMP100 sensor and the other end to the I2C shield.

Connections are shown in the picture above.

Step 3: Code:

The particle code for TMP100 can be downloaded from our GitHub repository- Dcube Store

Here is the link for the same :

We have used two libraries for particle code, which are application.h and spark_wiring_i2c.h. Spark_wiring_i2c library is required to facilitate the I2C communication with the sensor.

You can also copy the code from here, it is given as follows:

// Distributed with a free-will license.

// Use it any way you want, profit or free, provided it fits in the licenses of its associated works.

// TMP100

// This code is designed to work with the TMP100_I2CS I2C Mini Module available in Dcube Store.



// TMP100 I2C address is 0x4F(79)

#define Addr 0x4F

float cTemp = 0, fTemp = 0;

void setup()


// Set variable

Particle.variable("i2cdevice", "TMP100");

Particle.variable("cTemp", cTemp);

// Initialise I2C communication as MASTER


// Initialise Serial communication, set baud rate = 9600


// Start I2C Transmission


// Select configuration register


// Set continuous conversion, comparator mode, 12-bit resolution


// Stop I2C Transmission




void loop()


unsigned int data[2];

// Start I2C Transmission


// Select data register


// Stop I2C Transmission


// Request 2 bytes of data

Wire.requestFrom(Addr, 2);

// Read 2 bytes of data

// cTemp msb, cTemp lsb

if (Wire.available() == 2)


data[0] =;

data[1] =;


// Convert the data

cTemp = (((data[0] * 256) + (data[1] & 0xF0)) / 16) * 0.0625;

fTemp = cTemp * 1.8 + 32;

// Output data to dashboard

Particle.publish("Temperature in Celsius : ", String(cTemp));

Particle.publish("Temperature in Fahrenheit : ", String(fTemp));



Step 4: Applications:

Various applications incorporating TMP100 low power, high accuracy digital temperature sensor include Power-Supply Temperature Monitoring, Computer Peripheral Thermal Protection, Battery Management as well as office machines.