Temperature Sensor Setup - Digital-Waters/WaterMonitorDevice GitHub Wiki

DS18B20 Temperature Sensor Setup and Initialization

This page provides instructions for setting up a DS18B20 temperature sensor on a Raspberry Pi Zero 2 W to capture temperature data in your water monitoring project.

Tools Needed

  • Wire cutters/strippers
  • Electrical tape

Parts Needed

  • DS18B20 Waterproof Temperature Sensor
  • Jumper wires (female-to-female preferred)
  • Raspberry Pi Zero 2 W Temperature Sensor

Instructions

1. Prepare the Sensor

Connect the DS18B20 temperature sensor to your Raspberry Pi using the following connections:

  • VCC (red wire) to 3.3V on the Raspberry Pi.
  • GND (black wire) to any ground pin.
  • Data (yellow wire) to GPIO4 (Pin 7).

2. Secure the Wiring

Cut and strip the casing of the sensor wires to the appropriate length. Twist the wires to ensure a secure connection with the GPIO pins. Use electrical tape or heat shrink tubing to cover any exposed wires.

Software Setup

To run the temperature code on a Raspberry Pi Zero 2 W, which is designed to read temperature data from a DS18B20 sensor, you need to follow pre-requisite steps for both hardware and software setup:

Software Setup

  1. Enable 1-Wire Interface:

    • Open the Raspberry Pi configuration tool: 
      sudo raspi-config
    • Navigate to Interfacing Options > 1-Wire and select Enable.
    • Reboot the Raspberry Pi to apply the changes: 
      sudo reboot

  2. Install Required Packages:

    • Ensure you have the necessary packages installed: 
      sudo apt-get update
sudo apt-get install python3 python3-pip

  3. Load 1-Wire Kernel Modules:

    • Ensure the 1-Wire kernel modules are loaded. Add the following lines to /boot/config.txt: 
      dtoverlay=w1-gpio
    • You may also need to manually load the modules: 
      sudo modprobe w1-gpio
sudo modprobe w1-therm

  4. Check for the Sensor:

    • Verify the sensor is detected. After rebooting, you should see a directory named /sys/bus/w1/devices/ that contains directories with names starting with 28- (the DS18B20 sensor's family code). You can check it by: 
      ls /sys/bus/w1/devices/