Overview

The Pixela Mini V3 uses a mini interaction layer on top of the larger firmware:

• 1 physical button
• 1 feedback LED

Even though some larger-firmware parts are still present in the codebase, the actual Mini V3 experience is driven by miniUpdateButton() in the main loop. In practice, this version is designed around 1 button.

Main pins used by the Mini V3

• main button: GPIO42
• feedback LED: GPIO41
• SD: GPIO21
• battery sensing: disabled by default in this V3 (BATTERY_SENSE_PIN = -1)

Practical wiring

1. Main button

The firmware uses:

• SHUTTER_PIN 42
• INPUT_PULLUP

Wiring:

• one side of the button -> GPIO42
• the other side of the button -> GND

Electrical behavior:

• released = HIGH