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Attaching a 16x2 LCD via I2C

This example code shows how to interface the Raspberry Pi Pico to one of the very common 16x2 LCD character displays. The display will need a 3.3V I2C adapter board as this example uses I2C for communications.

Note

These LCD displays can also be driven directly using GPIO without the use of an adapter board. That is beyond the scope of this example.

Wiring information

Wiring up the device requires 4 jumpers, to connect VCC (3.3v), GND, SDA and SCL. The example here uses I2C port 0, which is assigned to GPIO 4 (SDA) and 5 (SCL) in software. Power is supplied from the 3.3V pin.

Warning
Many displays of this type are 5v. If you wish to use a 5v display you will need to use level shifters on the SDA and SCL lines to convert from the 3.3V used by the RP2040. Whilst a 5v display will just about work at 3.3v, the display will be dim.
lcd 1602 i2c bb
Figure 1. Wiring Diagram for LCD1602A LCD with I2C bridge.

List of Files

CMakeLists.txt

CMake file to incorporate the example in to the examples build tree.

lcd_1602_i2c.c

The example code.

Bill of Materials

Table 1. A list of materials required for the example

Item

Quantity

Details

Breadboard

1

generic part

Raspberry Pi Pico

1

https://www.raspberrypi.com/products/raspberry-pi-pico/

1602A based LCD panel 3.3v

1

generic part

1602A to I2C bridge device 3.3v

1

generic part

M/M Jumper wires

4

generic part