Raspberry Pi + DS18B20 Temperature Sensor

HARDWARE:
Tested with two DS18B20 temperature probes;
1.) Waterproof DS18B20 Digital Temperature Sensor for Arduino
2.) Digital Temperature Sensor Module. CAT.NO: XC3700

48635249847_815be20c40_z

The DS18B20 provides 9 to 12-bit (configurable) temperature readings over a 1-Wire interface, so that only one wire (and ground) needs to be connected from a central microprocessor. Usable with 3.0-5.5V systems.
A 4.7k resistor is required as a pullup from the DATA to VCC line when using the sensor.

3 wires interface:
Type A : Red wire – VCC, Black wire – GND, Yellow wire – DATA
Type B : Red wire – VCC, Yellow wire – GND, Green wire – DATA

If you are using the XC3700Digital Temperature Sensor Module [JAYCAR] check the pin mapping as it isn’t a direct replica of the DS18B20. The 4.7k resistor is also preinstalled.

Jaycar

For the Raspberry Pi,
DATA is on GPIO4 by default, pin 7
VCC to pin 1 (3V3)
GND to pin 6 (GND)

pi3_gpio

To enable 1-Wire, from the Raspberry Pi Configuration tool, found in the Preferences menu. In the Interfaces tab click on Enable for the 1-Wire interface

Device ID?

cd /sys/bus/w1/devices/
ls

48635250797_f62b553325_z

CODING: ADD THE LIBRARY VIA PIP
The Python library is called w1thermsensor
https://pypi.org/project/w1thermsensor/
https://github.com/timofurrer/w1thermsensor

sudo pip3 install w1thermsensor

Python script to check the temperature.

import time
from w1thermsensor import W1ThermSensor
sensor = W1ThermSensor()

while True:
    temperature = round(sensor.get_temperature())
    print("The temperature is %s celsius" % temperature)
    time.sleep(1)

REFERENCES:

  1. How it works: DS18B20 and Arduino [Tushev]
  2. Measuring Temperature with a Raspberry Pi Temperature Sensor (1-Wire) [tutorials-raspberrypi.com]
  3. Sensors – Temperature with the 1-Wire interface and the DS18B20 [The PiHut]
  4. DS18B20 Temperature Sensor With Python (Raspberry Pi) (2017-Jun-25) [bigl.es]
  5. Temperature Sensing With Raspberry Pi (2017-Oct-02) [core-electronics]
  6. OneWire Library: OneWire Arduino Library, connecting 1-wire devices (DS18S20, etc) to Teensy [PJRC]
  7. Raspberry Pi DS18B20 Temperature Sensor Tutorial [Circuit Basics]
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