Light
About the Light PCB
Light is an open source STM32 PCB design by AleBerta311, published on GitHub under the GPL-3.0 license. It is a 2-layer board measuring 73.7 × 57.2 mm, with 31 components from 20 distinct parts.
Its main chip is the C8734, from the STM32 family. Other key parts include the ALS-PDIC15-21B/TR8 and C841796. By type, the board carries 14 capacitors, 6 resistors, 3 ICs, 3 diodes, 2 connectors and 1 crystal.
From the project
A simple PCB schematic for USB LED light that turns on when it's dark.
This PCB uses USB voltage to control a sensor that turns light on when its dark. The switch and debug pins are used to transfer the code for the microprocessor which controls the sensor and turns on/off the light.
Main components on the Light
Light bill of materials (BOM)
31 components, 20 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | ALS-PDIC15-21B/TR8 ALS-PDIC15-21B_TR8 | ALSPDIC1521BTR8 | IC1 |
| 1 | C8734 STM32F103C8T6 | LQFP-48_7x7mm_P0.5mm | U2 |
| 1 | C841796 AMS1117CD-3.3 | TO-252-3_TabPin2 | U3 |
| 1 | C5360874 16 MHz 8pF | Crystal_SMD_3225-4Pin_3.2x2.5mm | X1 |
| 1 | C2765194 USB_A | USB_A_Molex_67643_Horizontal | J1 |
| 1 | Conn_01x04_Pin | FanPinHeader_1x04_P2.54mm_Vertical | J2 |
| 1 | C273395 SW_SPDT | SW_E-Switch_EG1224_SPDT_Angled | SW1 |
| 1 | C2286 RED | LED_0603_1608Metric | D1 |
| 2 | C84257 LED | LED_0805_2012Metric | D2, D3 |
| 1 | C127301 120R | L_0603_1608Metric | FB1 |
| 5 | C694490 100n | C_0402_1005Metric | C1, C2, C3, C4, C9 |
| 1 | C385036 10u | C_0603_1608Metric | C5 |
| 1 | C342982 10n | C_0402_1005Metric | C6 |
| 2 | C162280 1u | C_0603_1608Metric | C7, C8 |
| 2 | C1864375 8p | C_0402_1005Metric | C10, C11 |
| 3 | C76634 22u | C_0805_2012Metric | C12, C13, C14 |
| 1 | C131361 10k | R_0402_1005Metric | R1 |
| 2 | C114759 1k5 | R_0402_1005Metric | R2, R3 |
| 1 | C2828840 50k | R_0805_2012Metric | R4 |
| 2 | C226677 100R | R_1206_3216Metric | R5, R6 |
Light design files
The KiCad project lives in the AleBerta311/LightPCB repository on GitHub; these links point at the commit this page was built from.
Light: common questions
What microcontroller does the Light use?
The Light is built around the C8734, from the STM32 family.
How big is the Light PCB?
The Light measures 73.7 × 57.2 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Light?
31 components, from 20 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 Light design files?
From the AleBerta311/LightPCB 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 Light design in my own project?
Yes, under the terms of its GPL-3.0 license, which AleBerta311 chose for the repository.
Can I test firmware for the Light without the hardware?
Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug STM32 firmware against it before you order a PCB.
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