HardLabs

RB SWITCH

mrhunsaker·RB_SWITCH·electrical/mechanical_switch/RB_Switch.kicad_pcb

RB SWITCH PCB layout, top view — open source ESP32 board by mrhunsaker

About the RB SWITCH PCB

RB SWITCH is an open source ESP32 PCB design by mrhunsaker, published on GitHub under the Apache-2.0 license. It is a 4-layer board measuring 115 × 38 mm, with 32 components from 19 distinct parts.

Its main chip is the ESP32-S3-MINI-1-N4R2, from the ESP32 family. By type, the board carries 12 capacitors, 8 resistors, 3 switches, 1 IC, 1 diode and 1 inductor.

It belongs with the iot & wireless and power & battery designs in this gallery.

From the project

Accessibility Switch with 3 buttons for previous, select, and next

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, so it works with Switch Control (iOS/iPadOS), Switch Access (Android), and any app that accepts keyboard input.

1. Power the switch from USB-C or its battery. 2. Pair RB Switch in the device's Bluetooth settings. 3. Press each button in a text field: Left, Enter, Right. 4. Set up Switch Control (iOS/iPadOS) or Switch Access (Android) from the guides below.

Main components on the RB SWITCH

ESP32-S3-MINI-1-N4R2

RB SWITCH bill of materials (BOM)

32 components, 19 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
ESP32-S3-MINI-1-N4R2
Espressif Systems
U1
1
BATT_JST-PH-2P
J_BAT1
1
USB4105-GF-A
J_USB1
1
TPS63001DRCR
Texas Instruments
REG1
3
B3F-1000
B3F-100x
Omron Electronics
SW1, SW2, SW3
1
BOOT
SW_BOOT1
1
RESET
SW_RST1
1
MCP73831T-2ACI/OT
U_CHG1
1
150060RS75000
STAT_LED
Wurth Elektronik
D1
1
SRN4018-2R2M
2.2uH
Bourns
L1
3
CL10A106KP8NNNC
10uF
Samsung Electro-Mechanics
C1, C3, C7
1
CL10A226MQ8NRNC
22uF
Samsung Electro-Mechanics
C2
2
CL10A105KB8NNNC
1uF
Samsung Electro-Mechanics
C4, C12
6
CC0603KRX7R9BB104
100nF
Yageo
C5, C6, C8, C9, C10, C11
1
RC0603FR-072KL
2k
Yageo
R1
1
RC0603FR-071KL
1k
Yageo
R2
2
RC0603FR-075K1L
5.1k
Yageo
R3, R4
2
RC0603FR-0710KL
10k
Yageo
R5, R6
2
RC0603FR-07100KL
100k
Yageo
R7, R8

RB SWITCH design files

The KiCad project lives in the mrhunsaker/RB_SWITCH repository on GitHub; these links point at the commit this page was built from.

RB SWITCH: common questions

What microcontroller does the RB SWITCH use?

The RB SWITCH is built around the ESP32-S3-MINI-1-N4R2, from the ESP32 family.

How big is the RB SWITCH PCB?

The RB SWITCH measures 115 × 38 mm, has 4 copper layers and is 1 mm thick.

How many components are on the RB SWITCH?

32 components, from 19 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.

Where can I download the RB SWITCH design files?

From the mrhunsaker/RB_SWITCH repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.

Can I use the RB SWITCH design in my own project?

Yes, under the terms of its Apache-2.0 license, which mrhunsaker chose for the repository.

Can I test firmware for the RB SWITCH without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug ESP32 firmware against it before you order a PCB.

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