Introduction: Temperature Measurement Using MCP9803 and Arduino Nano

MCP9803 is a 2-wire high accuracy temperature sensor. They are embodied with user- programmable registers that facilitate temperature sensing applications. This sensor is suited for highly sophisticated multi-zone temperature monitoring system.

In this tutorial the interfacing of the MCP9803 sensor module with arduino nano 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:

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

1. MCP9803

2. Arduino Nano

3. I2C Cable

4. I2C shield for arduino nano

Step 2: Hardware Hookup:

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

The MCP9803 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:

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Lets start with the arduino code now.

While using the sensor module with the arduino, we include Wire.h library. "Wire" library contains the functions which facilitate the i2c communication between the sensor and the arduino board.

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

#include<Wire.h>

// MCP9803 I2C address is 0x48(72)

#define Addr 0x48

void setup()

{

// 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 mode, Power-up default

Wire.write(0x60);

// Stop I2C Transmission

Wire.endTransmission();

delay(300);

}

void loop()

{

unsigned int data[2];

// Starts I2C communication

Wire.beginTransmission(Addr);

// Select data register

Wire.write(0x00);

// Stop I2C transmission

Wire.endTransmission();

// 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]) / 16.0;

if(temp > 2047)

{

temp -= 4096;

}

float cTemp = temp * 0.0625;

float fTemp = cTemp * 1.8 + 32;

// Output data to serial monitor

Serial.print("Temperature in Celsius : ");

Serial.print(cTemp);

Serial.println(" C");

Serial.print("Temperature in Fahrenheit : ");

Serial.print(fTemp);

Serial.println(" F");

delay(500);

}

In wire library Wire.write() and Wire.read() is used to write the commands and read the sensor output.

Serial.print() and Serial.println() is used to display the output of the sensor on the serial monitor of the Arduino IDE.

The output of the sensor is shown in the picture above.

Step 4: Applications:

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MCP9803 can be employed in a wide arena of devices which include personal computer and peripherals, hard disk drives, various entertainment systems, office systems and data communication systems. This sensor can be incorporated in various sophisticated systems.

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