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Temperature Measurement Using TMP112 and Particle Photon

TMP112 High-Accuracy, Low-Power, Digital Temperature Sensor I2C MINI module. The TMP112 is ideal for extended temperature measurement. This device offers an accuracy of ±0.5°C without requiring calibration or external component signal conditioning.

In this tutorial, the interfacing of the TMP112 sensor module with particle photon has been illustrated. To read the temperature values, we have used Particle Photon with an I2c adapter. This I2C adapter makes the connection to the sensor module easy and more reliable.

Step 1: Hardware Required:

The materials that we need for accomplishing our goal includes the following hardware components:

1. TMP112

2. Particle Photon

3. I2C Cable

4. I2C Shield for particle photon

Step 2: Hardware Hookup:

The hardware hookup section basically explains the wiring connections required between the sensor and the particle photon. Ensuring correct connections is the basic necessity while working on any system for the desired output. So, the requisite connections are as follows:

The TMP112 will work over I2C. Here is the example wiring diagram, demonstrating how to wire up each interface of the sensor.

Out-of-the-box, the board is configured for an I2C interface, as such, we recommend using this hookup if you’re otherwise agnostic. All you need is four wires!

Only four connections are required Vcc, Gnd, SCL and SDA pins and these are connected with the help of I2C cable.

These connections are demonstrated in the pictures above.

Step 3: Code for Temperature Measurement:

Let’s start with the particle code now.

While using the sensor module with the Particle, we include application.h and spark_wiring_i2c.h library. “application.h” and spark_wiring_i2c.h library contains the functions which facilitate the i2c communication between the sensor and the particle.

The entire particle code is given below for the convenience of the user:

// 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.
// TMP112
// This code is designed to work with the TMP112_I2CS I2C Mini Module available from ControlEverything.com.
// https://www.controleverything.com/content/Temperature?sku=TMP112_I2CS#tabs-0-product_tabset-2

#include 
#include 

// TMP112 I2C address is 0x48(72)
#define Addr 0x48

double cTemp = 0.0, fTemp = 0.0;
void setup() 
{
    // Set variable
    Particle.variable("i2cdevice", "TMP112");
    Particle.variable("cTemp", cTemp);
    
    // Initialise I2C communication as MASTER 
    Wire.begin();
    // Initialise Serial communication, set baud rate = 9600
    Serial.begin(9600);
    
    // Start I2C Transmission
    Wire.beginTransmission(Addr);
    // Select configuration register
    Wire.write(0x01);
    // Continuous conversion, comparator mode, 12-bit resolution
    Wire.write(0x60);
    Wire.write(0xA0);
    // Stop I2C Transmission
    Wire.endTransmission();
    delay(300);  
}

void loop()
{
    unsigned int data[2];
    // Start I2C Transmission
    Wire.beginTransmission(Addr);
    // Select temperature data register
    Wire.write(0x00);
    // Stop I2C Transmission
    Wire.endTransmission();
    delay(300);
    
    // Request 2 bytes of data
    Wire.requestFrom(Addr, 2);
    
    // Read 2 bytes of data
    // temp msb, temp lsb
    if(Wire.available() == 2)
    {
        data[0] = Wire.read();
        data[1] = Wire.read();
    }
    
    // Convert the data to 12-bits
    int temp = ((data[0] * 256) + (data[1])) / 16;
    if(temp > 2048)
    {
        temp -= 4096;
    }
    cTemp = temp * 0.0625;
    fTemp = cTemp * 1.8 + 32;
    
    // Output data to dashboard
    Particle.publish("Temperature in Celsius   : ", String(cTemp));
    delay(1000);
    Particle.publish("Temperature in Fahrenheit: ", String(fTemp));
    delay(1000); 
}    

Particle.variable() function creates the variables to store the output of the sensor and Particle.publish() function displays the output on the dashboard of the site.

The sensor output is shown in the picture above for your reference.

Step 4: Applications:

Various applications incorporating TMP112 low power, high accuracy digital temperature sensor include Power-Supply Temperature Monitoring, Computer Peripheral Thermal Protection, Battery Management as well as office machines.



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