Raspberry Pi Temperature Sensing

Raspberry Pi is a popular single-board computer that can be used for various applications including temperature sensing. In this article, we will explore how to measure temperature using Raspberry Pi.

Requirements

To measure temperature using Raspberry Pi, we require the following components:

• Raspberry Pi (any version)
• DS18B20 temperature sensor
• Breadboard
• Jumper wires

Circuit Diagram

• Connect the VCC pin of the temperature sensor to the 3.3V pin of Raspberry Pi
• Connect the GND pin of the temperature sensor to the GND pin of Raspberry Pi
• Connect the DATA pin of the temperature sensor to the GPIO4 pin of Raspberry Pi

Step-by-Step Guide

1. First, we need to enable the 1-Wire interface in Raspberry Pi. Open the terminal and run the following command:

   sudo nano /boot/config.txt
   

   Add the following line at the end of the file:

   dtoverlay=w1-gpio
   

   Save the file and reboot Raspberry Pi.

2. After rebooting, run the following commands in the terminal to load the necessary kernel modules:

   sudo modprobe w1-gpio
   sudo modprobe w1-therm
   

3. Navigate to the directory where the temperature sensor is connected:

   cd /sys/bus/w1/devices/
   

   You should see a directory with a long name. This is the unique identifier of the temperature sensor.

4. Navigate to the directory of the temperature sensor:

   cd 28-xxxx (replace xxxx with the unique identifier)
   

5. Read the temperature from the file "w1_slave" using the following command:

   cat w1_slave
   

   The temperature will be displayed in millidegrees Celsius.

Conclusion

In this article, we have learned how to measure temperature using Raspberry Pi and DS18B20 temperature sensor. With this knowledge, we can build various temperature monitoring systems using Raspberry Pi.