
This new Adafruit shield makes it easy to use a 16x2 Character LCD. We really like the RGB LCDs we stock in the shop both the RGB negative and RGB positive.
Shield 5 V supply pin for detached use; source says power the 5V pin with 5V.
Common ground for the shield when used detached from an Arduino.
I2C clock; guide says connect the SCL labelled pin to I2C clock. Also maps to A5 on Uno, D21 on Mega, and D3 on Leonardo.
I2C data; guide says connect SDA to I2C data. Also maps to A4 on Uno, D20 on Mega, and D2 on Leonardo.
The MCP23017 I2C port expander drives the 16x2 LCD and UP/DOWN/LEFT/RIGHT/SELECT/RESET buttons, so only the I2C/power pins are needed from the host.
I2C · 5V · 0V
Confirm the data interface matches your host board.
Module pins: 5V, GND, SCL, SDA. Schematik maps them to your board in the app.
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| Pin | Position | Type | Function | Voltage |
|---|
| 5V | power | Shield 5 V supply pin for detached use; source says power the 5V pin with 5V. | 5V | |
| GND | ground | Common ground for the shield when used detached from an Arduino. | 0V | |
| SCL | signal | I2C clock; guide says connect the SCL labelled pin to I2C clock. Also maps to A5 on Uno, D21 on Mega, and D3 on Leonardo. | ||
| SDA | signal | I2C data; guide says connect SDA to I2C data. Also maps to A4 on Uno, D20 on Mega, and D2 on Leonardo. | ||
| LCD/keypad via MCP23017 | interface | The MCP23017 I2C port expander drives the 16x2 LCD and UP/DOWN/LEFT/RIGHT/SELECT/RESET buttons, so only the I2C/power pins are needed from the host. |