In this project, we are going to make a Digital Thermometer using Arduino Uno. We will use DS18B20 temperature sensor to sense the temperature and Nokia 5110 LCD to display it. DS18B20 is a 1-Wire digital temperature sensor manufactured by Maxim Integrated and is capable of reporting degree celsius with 9 ~ 12 bit precision.
Components Required
- Arduino Uno
- DS18B20 Temperature Sensor
- Nokia 5110 LCD
- 1KΩ Potentiometer
- 10KΩ Resistors – 4
- 4.7KΩ Resistor
- 1KΩ Resistor
- 330Ω Resistor
- Connecting Wires
- Breadboard
Explanation
First we will connect Nokia 5110 LCD to Arduino as follows.
- Connect the GND pin of Nokia 5110 LCD to GND of Arduino.
- Connect the LED pin of Nokia 5110 LCD to middle pin of 1KΩ potentiometer through 330Ω resistor and connect other two pins of the potentiometer to VCC, GND.
- Connect the VCC pin of Nokia 5110 LCD to 3.3V output pin of Arduino.
- Connect the CLK pin of Nokia 5110 LCD to Pin 8 of Arduino through a 10KΩ resistor.
- Connect the DIN pin of Nokia 5110 LCD to Pin 9 of Arduino through a 10KΩ resistor.
- Connect the D/C pin of Nokia 5110 LCD to Pin 10 of Arduino through a 10KΩ resistor.
- Connect the SCE pin of Nokia 5110 LCD to Pin 11 of Arduino through a 1KΩ resistor.
- Connect the RST pin of Nokia 5110 LCD to Pin 12 of Arduino through a 10KΩ resistor.
Then connect DS18B20 temperature sensor to Arduino as follows.
- Connect left pin of DS18B20 to GND of Arduino.
- Connect right pin of DS18B20 to 5V output of Arduino.
- Connect middle pin of DS18B20 to Pin 2 of Arduino
- Connect a 4.7KΩ resistor from middle pin of DS18B20 to 5V as pull up.
Program
Libraries
You need to manually add following libraries to Arduino IDE as it is not included by default. You can ignore it if you already added it. Otherwise you can do following steps for that.
- Download Libraries
- Open Arduino IDE
- Go to Sketch >> Include Library >> Add .ZIP Library
- Select the downloaded ZIP file and press open
Read more: Digital Thermometer using Arduino and DS18B20 Sensor