Introduction: Measurement of Temperature Using AD7416ARZ and Particle Photon

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.

AD7416ARZ is 10-Bit temperature sensor with four single channel analog to digital convertors and an on board temperature sensor incorporated in it. The temperature sensor on the parts can be accessed via multiplexer channels. This high-accuracy temperature sensor has become an industry standard in terms of form, factor and intelligence, providing calibrated, linearized sensor signals in digital, I2C format.

In this tutorial the interfacing of the AD7416ARZ sensor module with particle photon has been illustrated. To read the temperature values, we have used arduino 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. AD7416ARZ

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 AD7416ARZ 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 Measurement of Temperature:

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:

<p>#include<application.h> </p><p>#include<spark_wiring_i2c.h> </p><p>// AD7416ARZ I2C address is 0x48(72)</p><p>#define Addr 0x48</p><p>float cTemp = 0.0, fTemp = 0.0;</p><p>int temp = 0;</p><p>void setup()</p><p>{  </p><p>// Set variable  </p><p>Particle.variable("i2cdevice", "AD7416ARZ");  </p><p>Particle.variable("cTemp", cTemp);</p><p>// Initialise I2C communication as Master  </p><p>Wire.begin();  </p><p>// Initialise serial communication, set baud rate = 9600  </p><p>Serial.begin(9600);  </p><p>delay(300);</p><p>}</p><p>void loop()</p><p>{  </p><p>unsigned int data[2];</p><p>// Start I2C transmission  </p><p>Wire.beginTransmission(Addr);  </p><p>// Select data register  </p><p>Wire.write(0x00);  </p><p>// Stop I2C transmission  </p><p>Wire.endTransmission();</p><p>// Request 2 byte of data  </p><p>Wire.requestFrom(Addr, 2);</p><p>// Read 2 bytes of data  </p><p>// temp msb, temp lsb  </p><p>if (Wire.available() == 2)  </p><p>{    </p><p>data[0] =;    </p><p>data[1] =;  </p><p>}</p><p>// Convert the data to 12 bits  </p><p>// Convert the data to 10 bits  </p><p>temp = ((data[0] * 256) + (data[1] & 0xC0)) / 64;  </p><p>if (temp > 511)  </p><p>{    </p><p>temp -= 1024;  </p><p>}    </p><p>cTemp = temp * 0.25;  </p><p>fTemp = (cTemp * 1.8) + 32;</p><p>// Output data to dashboard  </p><p>Particle.publish("Temperature in Celsius : ", String(cTemp));  </p><p>Particle.publish("Temperature in Fahrenheit : ", String(fTemp));  </p><p>delay(1000);</p><p>}</p>

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:

AD7416ARZ is a 10-Bit Temperature sensor with four single channel analog to digital converter can perform the operation of Data acquisition with ambient temperature monitoring. It can also be employed in Industrial process control systems, Automotive Battery-charging applications and Personal computers.