Example Code for Arduino-Temperature Measurement

Hardware Preparation

• TMP100 Temperature Sensor
• Arduino Board
• Jumper Wires (Male-to-Male) Quantity: 4

Software Preparation

• Development Tool: Arduino IDE (Version 1.8.x or later), Download Link: Arduino Software
• Library: Wire library (pre-installed with Arduino IDE, no additional setup required)

Wiring Diagram

Sample Code

/*
 Sample code for the TMP100 Temperature sensor
 website:www.DFRobot.com

 Connection:

 VCC-5V
 GND-GND
 SDA-Analog pin 4
 SCL-Analog pin 5
*/

#include <Wire.h>
int tmpAddress = B1001011; //Slave Addresses set
int ResolutionBits = 10;   //Resolution set
void setup()
{
  Wire.begin();        // join i2c bus (address optional for master)
  Serial.begin(9600);  // start serial for output
  SetResolution();
}

void loop()
{
  getTemperature();
  delay(200);
}

float getTemperature()
{
  Wire.requestFrom(tmpAddress,2);
  byte MSB = Wire.read();
  byte LSB = Wire.read();
  int TemperatureSum = ((MSB << 8) | LSB) >> 4;
  float celsius = TemperatureSum*0.0625;
  Serial.print("Celsius: ");
  Serial.println(celsius);
}

void SetResolution(){
  if (ResolutionBits < 9 || ResolutionBits > 12) exit;
  Wire.beginTransmission(tmpAddress);
  Wire.write(B00000001); //addresses the configuration register
  Wire.write((ResolutionBits-9) << 5); //writes the resolution bits
  Wire.endTransmission();
  Wire.beginTransmission(tmpAddress); //resets to reading the temperature
  Wire.write((byte)0x00);
  Wire.endTransmission();
}

Result

Open the Arduino IDE Serial Monitor (baud rate: 9600) to view continuous temperature readings in Celsius. Example output:
Celsius: 25.125
Celsius: 25.25
Celsius: 25.375