RB Switch

The RB Switch is a three-button Bluetooth Low Energy (BLE) accessibility switch. It presents itself to a computer, tablet, or phone as a standard Bluetooth keyboard.

Button functions

Physical switch	MCU GPIO	Keyboard key
SW1	GPIO10	Left Arrow
SW2	GPIO11	Enter
SW3	GPIO12	Right Arrow

Each button press sends one key press followed by one key release. Holding a button does not repeat the key.

Quick start

1. Power the RB Switch using USB-C or the installed single-cell Li-Po battery.
2. Open Bluetooth settings on the device you want to use.
3. Select RB Switch.
4. Complete pairing if prompted.
5. Test SW1, SW2, and SW3.
6. If using Switch Control (iOS/iPadOS) or Switch Access (Android), add the buttons as external switches. Android and iOS/iPadOS handle a 3-button switch differently — see Setup & Pairing before you configure scanning.

Current hardware

The current board uses an ESP32-S3-MINI-1-N4R2, three Omron B3F-series tactile switches, USB-C, a Li-Po battery connection and charger, a 3.3 V buck-boost regulator, battery-voltage sensing, and a charger-status LED.

The production design has three mechanical switch inputs. Touch sensors, proximity sensors, NeoPixel/RGB indicators, mono-jack inputs, and legacy F-key mappings are not part of the production design.

Documentation

• Setup & Pairing
• Android Switch Access
• iOS/iPadOS Switch Control
• Switch Operation
• Firmware
• Firmware Customization
• Hardware
• Troubleshooting
• QR Code