CANADUINO D1 Mini Keypad / JoyPad I2C

CANADUINO® D1 Mini Keypad / JoyPad I2C Module (PCF8574)

The CANADUINO® JoyPad module adds six tactile buttons to your D1 Mini projects, connected through an I2C I/O expander. It’s the ideal user interface for menus, games, or control applications.

The JoyPad provides:

• 4 directional buttons (Up, Down, Left, Right)
• 1 Enter button
• 1 Back button

The module is based on the PCF8574 GPIO expander and connects to the D1 Mini via standard I2C pins (D4 = SDA, D5 = SCL). The default I²C address is 0x24. A solder jumper on the back allows switching to 0x20, enabling two JoyPads on the same I²C bus or avoiding address conflicts.

Each button is connected through the expander with built‑in pull‑ups, so a pressed button reads as LOW while unpressed is HIGH.

Key features:

• 6 tactile buttons (4 cursor keys, Enter, Back)
• Controlled via I2C (PCF8574)
• Default address 0x24, changeable to 0x20 via jumper
• Simple integration with ESP8266 / ESP32 D1 Mini

Code Example:

Button Test Demo - shows the name of the pressed button on the 0.66" D1 Mini OLED screen in real time. (Download)

Snake Game - a fun demonstration of the JoyPad’s capabilities, running directly on your D1 Mini with the D1 Mini 0.66" OLED screen. (Download)