QWIIC-SWITCH-PROJECT
About the QWIIC-SWITCH-PROJECT PCB
QWIIC-SWITCH-PROJECT is an open source PCB design by Harshad-vali, published on GitHub. It is a 2-layer board measuring 30 × 24 mm, with 19 components from 13 distinct parts.
Other key parts include the PCA9536DR, PCA9306 and 74HC1G04GW,125. By type, the board carries 8 resistors, 3 ICs, 3 capacitors, 2 connectors, 2 diodes and 1 transistor.
From the project
"Qwiic-compatible I2C power switch module using PCA9536 GPIO expander — KiCad schematic, PCB layout, and BOM."
A compact, Qwiic-compatible power switch module built around an I2C GPIO expander, designed for easy integration into modular sensor/electronics setups without extra wiring or a microcontroller doing the switching directly.
This board lets a host microcontroller switch power to a downstream load over I2C, using a GPIO expander instead of dedicated GPIO pins. It's designed to snap into the Qwiic ecosystem, so it can be daisy-chained with other Qwiic boards with no soldering.
Main components on the QWIIC-SWITCH-PROJECT
QWIIC-SWITCH-PROJECT bill of materials (BOM)
19 components, 13 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | PCA9536DR | PCA9536 | IC1 |
| 1 | PCA9306 | PCA9306 | IC2 |
| 1 | 74HC1G04GW,125 74HC1G04GW | U1G1 NEW | IC3 |
| 1 | PJS6631_S2_00001 PMOS | SOT-23 | Q1 |
| 2 | D01-9922046 Conn_01x04_Pin | PinHeader_1x04_P2.54mm_Vertical | J1, J3 |
| 1 | 150080RS75000 RED | LED_0805_2012Metric | D1 |
| 1 | 150080GS75000 GREEN | LED_0805_2012Metric | D2 |
| 2 | CC0805KPX7R9BB104 0.1uF | C_0805_2012Metric | C1, C3 |
| 1 | C0603C106M9PAC7411 10uF | C_0603_1608Metric | C2 |
| 2 | RC0805FR-071KL 1K | R_0805_2012Metric | R1, R5 |
| 1 | RC0805FR-07470RL 470 | R_0805_2012Metric | R2 |
| 4 | RC0805FR-072K2L 2.2K | R_0805_2012Metric | R3, R4, R6, R7 |
| 1 | RC0805FR-07200KL 200K | R_0805_2012Metric | R8 |
QWIIC-SWITCH-PROJECT design files
The KiCad project lives in the Harshad-vali/QWIIC-SWITCH-PROJECT repository on GitHub; these links point at the commit this page was built from.
QWIIC-SWITCH-PROJECT: common questions
How big is the QWIIC-SWITCH-PROJECT PCB?
The QWIIC-SWITCH-PROJECT measures 30 × 24 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the QWIIC-SWITCH-PROJECT?
19 components, from 13 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 QWIIC-SWITCH-PROJECT design files?
From the Harshad-vali/QWIIC-SWITCH-PROJECT 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 QWIIC-SWITCH-PROJECT design in my own project?
The repository has no license, so all rights stay with Harshad-vali. Use it as a reference, and ask the author before reusing the design.