Objective:
In this project, we will use GPIO pins to send text to 1602 LCD screen.
If you don’t know what is GPIO layout, check our tutorial How to read Raspberry Pi i/o pin diagram (GPIO pin graph)
Parts:
1 pc | Raspberry Pi 2/3/zero | ![]() |
1 pc | 8GB MicroSD memory card preinstalled Raspbian OS. | ![]() |
1 pc | 1602 LCD screen | ![]() |
1 pc | Potentiometer | ![]() |
1 pc | breadboard | ![]() |
1 pc | GPIO breakout kit(optional) | ![]() |
Prerequisite:
Raspbian should be upgraded to latest version in order to support RPI.GPIO module
Please run following commands in shell:
Raspberry Pi and 1602 LCD pin connection
LCD Pin | Description | Pi Function | RasPi Pin |
01 | GND | GND | 06 |
02 | +5V | +5V | 02 |
03 | Contrast | To Potentiometer middle pin | |
04 | RS | GPIO7 | 26 |
05 | RW | GND | 06 |
06 | Enable | GPIO8 | 24 |
11 | D4 | GPIO25 | 22 |
12 | D5 | GPIO24 | 18 |
13 | D6 | GPIO23 | 16 |
14 | D7 | GPIO18 | 12 |
15 | +5V | +5V | 02 |
16 | GND | GND | 06 |
Circuit Graph:
Caution: Unlike Arduino board 5V input voltage, Raspberry GPIO pin accept only 3 Volt. Wrong voltage input might damage the Pi board. Please be very careful!
Write python code
You have two ways to write python code:
Option 1)
download http://osoyoo.com/driver/pi_lcd.py and copy/paste it to raspberry pi
Option 2)
You can also download above python file from our server by typing following shell command:
sudo wget –no-check-certificate http://osoyoo.com/driver/pi_lcd.py
Finally, run following command in shell window:
sudo python pi_lcd.py
Adjust the Potentiometer to make LCD text displaying clearly. You will see following text string rolling in LCD screen:
LCD work with
Raspberry Pi!
Designed by
osoyoo.com
Read Tutorial @
osoyoo.com
Video Demo:
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