1.4 Interface Introduction
Witty Pi 4 supports all Raspberry Pi models that has the 40-pin GPIO header, including A+, B+, 2B,
Zero, Zero W, Zero 2 W, 3B, 3B+, 3A+ and 4B. You will need to solder the 40-pin header to Zero/Zero
W/Zero 2 W model beforehand, so they can make reliable connection with Witty Pi.
The picture below shows the available interfaces of Witty Pi 4.
1. USB type C connector for 5V power input (5V)
2. XH2.54 connector for higher voltage input (VIN)
3. Unpopulated power header with VIN, 5V and GND
4. White LED as status indicator
5. On/off switch
6. 2x20 pin stacking header for connecting to Raspberry Pi
7. ICSP header for uploading firmware
8. 3V (CR2032) battery holder
9. Unpopulated external 3V battery connector
10. Unpopulated 7-pin header for internal I2C bus and extra signals
11. Unpopulated 7-pin header for extension or integration
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