Pennyesc
About the Pennyesc PCB
Pennyesc is an open source STM32 PCB design by qwertpas, published on GitHub under the MIT license. It is a 4-layer board measuring 15.9 × 14 mm, with 17 components from 12 distinct parts.
Its main chip is the STM32L011F4UX, from the STM32 family. Other key parts include the MCT8316Z0R and TMAG5273A1QDBVR. By type, the board carries 7 capacitors, 7 resistors and 3 ICs.
It belongs with the robotics & motion designs in this gallery.
From the project
Tiny and cheap brushless motor controller
Ended up being about $6/board for raw components, but after setup fees ($16), shipping ($39), and customs ($21) the total was $111 for 5 boards. It should be a lot better when ordering in larger quantities.
Aiming for $10-15 component cost, around 15 mm diameter Assembled by JLCPCB using their in-stock parts MP6536 3-phase power stage ($3.38) 5-26 V input 5.5 A current limit PWM input for each half-bridge no current sense 5x5 mm MA782 magnetic encoder ($4.11) SPI 2x2 mm STM32L011 microcontroller ($1.28) 32 MHz clock 3x3 mm
Main components on the Pennyesc
Pennyesc bill of materials (BOM)
17 components, 12 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | STM32L011F4UX STM32L011F4Ux | ST_UFQFPN-20_3x3mm_P0.5mm | U1 |
| 1 | MCT8316Z0R | MCT8316Z0RRGFR-IPC_C | U2 |
| 1 | TMAG5273A1QDBVR | SOT95P280X140-6N | U3 |
| 2 | CL05A105KA5NQNC 1uF | C_0402_1005Metric | C1, C2 |
| 1 | 22UF 22uF | C_0603_1608Metric | C3 |
| 2 | 0.1UF 0.1uF | C_0402_1005Metric | C4, C6 |
| 1 | 1UF 1uF | C_0402_1005Metric | C5 |
| 1 | 10UF 10uF | C_0603_1608Metric | C7 |
| 1 | 22R | R_0402_1005Metric | R1 |
| 4 | 3.3K 3.3k | R_0402_1005Metric | R2, R3, R5, R6 |
| 1 | 2k | R_0402_1005Metric | R4 |
| 1 | 1k | R_0402_1005Metric | R8 |
Pennyesc design files
The KiCad project lives in the qwertpas/pennyesc repository on GitHub; these links point at the commit this page was built from.
- Layoutpennyesc.kicad_pcb
- Schematicpennyesc.kicad_sch
- BOMproduction/pennyesc_fix_bom.csv
Pennyesc: common questions
What microcontroller does the Pennyesc use?
The Pennyesc is built around the STM32L011F4UX, from the STM32 family.
How big is the Pennyesc PCB?
The Pennyesc measures 15.9 × 14 mm, has 4 copper layers and is 1 mm thick.
How many components are on the Pennyesc?
17 components, from 12 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 Pennyesc design files?
From the qwertpas/pennyesc 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 Pennyesc design in my own project?
Yes, under the terms of its MIT license, which qwertpas chose for the repository.
Can I test firmware for the Pennyesc 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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