LCD Display

These LCD displays can show text.

These displays are usually able to display 16 characters per line on 2 lines (16x2), but other formats (notably 20x4) are also available


Wire up

Connect to the Pico as follows:

Wire up
Circuit Connection
VCC Battery +
GND Pico GND
GND Battery -
SCL Pico GP5 or other SCL pin
SDA Pico GP4 or other SCL pin

Note that the black connector needs to be split to both the battery and the Pico. You can do this via a breadboard.


Add library

You need to add the lcd library. Copy the lcd folder from the lib directory on github to the lib directory on the pico:

Add lib

Code

Write this code and download to the Pico.

See code on github 
# 16x2 character LCD test

import board
import busio
import time
from lcd.lcd import LCD, CursorMode
from lcd.i2c_pcf8574_interface import I2CPCF8574Interface

# Set up LCD display
i2c = busio.I2C(board.GP5, board.GP4) # SCL, SDA
interface = I2CPCF8574Interface(i2c, 0x27)
lcd = LCD(interface, num_rows=2, num_cols=20)
lcd.set_cursor_mode(CursorMode.HIDE)
lcd.set_backlight(1)

# Single line
lcd.clear()
lcd.print("abcdefghijklmnop")
time.sleep(2)

# Double line
lcd.clear()
lcd.print("Line 1\nLine 2")
time.sleep(2)

# Position
lcd.clear()
lcd.set_cursor_pos(1, 4)
lcd.print("Here I am")
time.sleep(2)


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