Introduction: Raspberry Pi - TMP100 Temperature Sensor Java Tutorial
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 a java code using Raspberry Pi.
Step 1: What You Need..!!
1. Raspberry Pi
3. I²C Cable
LINK : https://www.controleverything.com/content/I2C-Cables?sku=I2CAFF3
4. I²C Shield for Raspberry Pi
LINK : https://www.controleverything.com/content/I2C-Master?sku=TOUTPI2
5. Ethernet Cable
Step 2: Connection:
Take a I2C shield for raspberry pi and gently push it over the gpio pins of raspberry pi.
Then connect the one end of I2C cable to TMP100 sensor and the other end to the I2C shield.
Also connect the Ethernet cable to the pi or you can use a WiFi module.
Connections are shown in the picture above.
Step 3: Code:
The java code for TMP100 can be downloaded from our github repository- ControlEverythingCommunity
Here is the link for the same :
The datasheet of TMP100 can be found here:
We have used pi4j library for java code, the steps to install pi4j on raspberry pi is described here:
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.
// This code is designed to work with the TMP100_I2CS I2C Mini Module available from ControlEverything.com.
public class TMP100
public static void main(String args) throws Exception
// Create I2C bus
I2CBus Bus = I2CFactory.getInstance(I2CBus.BUS_1);
// Get I2C device, TMP100 I2C address is 0x4F(79)
I2CDevice device = Bus.getDevice(0x4F);
// Select configuration register
// Continuous conversion, comparator mode, 12-bit resolution
// Read 2 bytes of data
// temp msb, temp lsb
byte data = new byte;
device.read(0x00, data, 0, 2);
// Convert the data to 12-bits
int temp = ((data & 0xFF) * 256 + (data & 0xF0)) / 16;
if(temp > 2047)
temp -= 4096;
double cTemp = temp * 0.0625;
double fTemp = cTemp * 1.8 + 32;
// Output data to screen
System.out.printf("Temperature in Celsius : %.2f C %n", cTemp);
System.out.printf("Temperature in Fahrenheit : %.2f F %n", 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.
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