Clock
About the Clock PCB
Clock is an open source STM32 PCB design by blakesmith, published on GitHub. It is a 2-layer board measuring 45.7 × 58.4 mm, with 25 components from 20 distinct parts.
Its main chip is the 497-17017, from the STM32 family. Other key parts include the 497-7308-1, 497-1242-6 and AS1115-BSST. By type, the board carries 7 capacitors, 7 resistors, 4 ICs, 3 diodes, 2 connectors and 1 crystal.
From the project
Blake's embedded projects
Main components on the Clock
Clock bill of materials (BOM)
25 components, 20 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | 497-7308-1 LM1117-3.3 | SOT-223 | U1 |
| 1 | 497-1242-6 AS1115 | QSOP-24_3.9x8.7mm_Pitch0.635mm | U2 |
| 1 | AS1115-BSST LTC-4727JS | LTC-4727 | U3 |
| 1 | 497-17017 STM32L151C8TxA | LQFP-48_7x7mm_Pitch0.5mm | U4 |
| 1 | 32.768kHz | ECS-31B_xtal | Y1 |
| 1 | CP-2524SJ USB_B_Micro | 10118192-0001LF | J1 |
| 1 | 455-1734-1 Conn_ARM_JTAG_SWD_10 | Pin_Header_Straight_2x05_Pitch1.27mm_SMD | J3 |
| 1 | PEC11R | PEC11 | S1 |
| 1 | 160-1645-1 LED Blue | LED_0805_HandSoldering | D1 |
| 1 | 160-1423-1 LED Green | LED_0805_HandSoldering | D2 |
| 1 | 160-1427-1 LED Red | LED_0805_HandSoldering | D3 |
| 3 | 478-1395-1 0.1uf | C_0805_HandSoldering | C1, C2, C4 |
| 1 | 478-1405-1 0.1uf | C_0805_HandSoldering | C3 |
| 1 | 478-1415-1 0.1uF | C_0805_HandSoldering | C5 |
| 2 | 478-1395-1 10pf | C_0805_HandSoldering | C6, C7 |
| 1 | 311-10KAR 10K | R_0805_HandSoldering | R1 |
| 1 | 311-24.9CR 10K | R_0805_HandSoldering | R2 |
| 2 | 311-40.2CR 10k | R_0805_HandSoldering | R3, R4 |
| 1 | 311-40.2CR 300 | R_0805_HandSoldering | R5 |
| 2 | 311-51.1CR 300 | R_0805_HandSoldering | R6, R7 |
Clock design files
The KiCad project lives in the blakesmith/embedded repository on GitHub; these links point at the commit this page was built from.
Clock: common questions
What microcontroller does the Clock use?
The Clock is built around the 497-17017, from the STM32 family.
How big is the Clock PCB?
The Clock measures 45.7 × 58.4 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Clock?
25 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 Clock design files?
From the blakesmith/embedded repository on GitHub, which has the KiCad layout and the BOM; the links under Design files point to each one.
Can I use the Clock design in my own project?
The repository has no license, so all rights stay with blakesmith. Use it as a reference, and ask the author before reusing the design.
Can I test firmware for the Clock 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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