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.
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Note
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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 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.
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Warning
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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. |
- CMakeLists.txt
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CMake file to incorporate the example in to the examples build tree.
- lcd_1602_i2c.c
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The example code.
Item |
Quantity |
Details |
Breadboard |
1 |
generic part |
Raspberry Pi Pico |
1 |
|
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 |