Cheap
About the Cheap PCB
Cheap is an open source STM32 PCB design by hardenedlinux, published on GitHub under the CC0-1.0 license. It is a 2-layer board measuring 68 × 40 mm, with 44 components from 23 distinct parts.
Its main chip is the STM32F103C8T6, from the STM32 family. Other key parts include the AMS1117-3.3. By type, the board carries 14 resistors, 13 capacitors, 5 connectors, 5 diodes, 2 ICs and 2 fuses.
From the project
Cheap PCB: Better understanding the current status of hardware supply chain
We did this experimental for fun and profit( better assessment for hardware supply chain security). Read the full story.
Main components on the Cheap
Cheap bill of materials (BOM)
44 components, 23 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | AMS1117-3.3 | SOT-89-3_Handsoldering | U1 |
| 1 | STM32F103C8T6 | LQFP-48_7x7mm_P0.5mm | U2 |
| 1 | S9012 | SOT-23_Handsoldering | Q1 |
| 1 | 8MHz | Crystal_SMD_3225-4Pin_3.2x2.5mm_HandSoldering | Y1 |
| 1 | USB_C_Receptacle_USB2.0 | USB_C_Receptacle_Palconn_UTC16-G | J1 |
| 2 | Conn_02x04_Odd_Even | PinHeader_2x04_P2.54mm_Vertical | J2, J3 |
| 2 | Conn_01x25_Male | PinHeader_1x25_P2.54mm_Vertical | J4, J5 |
| 1 | 500mA | Fuse_0805_2012Metric_Pad1.15x1.40mm_HandSolder | F1 |
| 1 | 100mA | Fuse_0805_2012Metric_Pad1.15x1.40mm_HandSolder | F2 |
| 1 | KMR241G | SW_Push_1P1T-SH_NO_CK_KMR2xxG | SW1 |
| 2 | 1N5817WS | D_SOD-323_HandSoldering | D1, D3 |
| 1 | LED(RED) | LED_0603_1608Metric_Pad1.05x0.95mm_HandSolder | D2 |
| 1 | LED(BLUE) | LED_0603_1608Metric_Pad1.05x0.95mm_HandSolder | D4 |
| 1 | LED(YELLOW) | LED_0603_1608Metric_Pad1.05x0.95mm_HandSolder | D5 |
| 2 | 10uF | C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C1, C3 |
| 8 | 100nF | C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C2, C4, C7, C8, C9, C10, C11, C12 |
| 2 | 22pF | C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C5, C6 |
| 1 | 10nF | C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C13 |
| 6 | 1K | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R1, R7, R9, R10, R12, R14 |
| 2 | 5.1K | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R2, R4 |
Show 3 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 2 | 22 | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R3, R5 |
| 1 | 1K5 | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R6 |
| 3 | 10K | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R8, R11, R13 |
Cheap design files
The KiCad project lives in the hardenedlinux/cheap-pcb repository on GitHub; these links point at the commit this page was built from.
Cheap: common questions
What microcontroller does the Cheap use?
The Cheap is built around the STM32F103C8T6, from the STM32 family.
How big is the Cheap PCB?
The Cheap measures 68 × 40 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Cheap?
44 components, from 23 distinct parts. The full bill of materials is listed on this page.
Where can I download the Cheap design files?
From the hardenedlinux/cheap-pcb repository on GitHub, which has the KiCad layout; the links under Design files point to each one.
Can I use the Cheap design in my own project?
Yes, under the terms of its CC0-1.0 license, which hardenedlinux chose for the repository.
Can I test firmware for the Cheap 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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