LCD Display and Keypad controller connected to Raspberry Pi via i2c KiCAD (http://www.kicad-pcb.org) is used for schematics and PCB layout
Connection to the Raspberry Pi:
| RasPi pin | Keypad / LCD Signal | Description |
|---|---|---|
| 2 | 5V | power |
| 3 | SCL | serial clock |
| 6 | SDG | serial ground / shield |
| 5 | SDA | serial data |
| 6 | GND | ground |
| 12 | INT | interrupt |
You can populate the PCB partially if only the LCD display or the keypad controller is needed.
Blockdiagramm
Raspberry interface
Display:
Keypad:
Created using KiCAD 5.1.3 Conceived using information from: https://5volt-junkie.net/i2c-keypad/