2 layers53.2 × 53.5 mm
BRUSHLESS
AssaadMH/sensorless-bldc-control
Spinning a brushless motor with no position sensor — commutating on the back-EMF zero crossings instead.
14 parts1MIT
2 layers123.5 × 132 mm
Spinning a brushless motor with no position sensor — commutating on the back-EMF zero crossings instead.
- Size
- 123.5 × 132 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 28
- Nets
- 29
- Pads
- 128
- Tracks, vias
- 207, 2
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 22 Aug 2026
- Updated
- 30 Sep 2026
Overview
BLDC is an open-source printed circuit board by AssaadMH, from the AssaadMH/sensorless-bldc-control repository on GitHub, published under the MIT licence. It is a 2-layer board of 123.5 × 132 mm with 28 parts on 29 nets, routed with 207 tracks and 2 vias.
It is built around the IR2110L4 and IRF540N. Its parts include 6 capacitors, 6 resistors, 6 transistors, 4 ICs and 3 diodes. It belongs with the robots and motor control and sensors and measurement boards of this library.
Main components
2README
README.mdSensorless BLDC Motor Control (Back-EMF)
Spinning a brushless motor with no position sensor — commutating on the back-EMF zero crossings instead.
2025·BLDC·Sensorless·Back-EMF·Arduino·Proteus·Motor control
About
A focused study of how to run a brushless-DC motor without any Hall sensors. Removing the position sensors makes the motor cheaper and more robust, but it also removes the thing the controller normally relies on to know when to commutate — so the rotor position has to be recovered from the motor itself.
The method is back-EMF zero-crossing detection. At any instant one of the three windings is unenergised, and the voltage it generates — its back-EMF, measured against a virtual neutral point — crosses zero exactly between two commutation events. Detecting that crossing, waiting the right electrical angle, and stepping the PWM to the next phase keeps the motor in sync with no sensor at all.
The work covers the electrical and mechanical model of the motor, the commutation and PWM logic, and a Proteus simulation alongside the Arduino implementation — the standard progression of proving the idea in simulation before trusting it to real windings, which is exactly where sensorless schemes tend to bite.
Contents
captures/
docs/
kicad/Notes
Third-party work used here
Everything in this repository is my own work. It builds on the following, which are not mine and are used under their own licences:
- KiCad by KiCad project — https://kicad.org
- Proteus Design Suite by Labcenter Electronics — https://labcenter.com
Author
Lassaad Mahmoudi — assaadmahmoudi0@gmail.com
https://linkedin.com/in/mahmoudi-assaad
Parts
28| Qty | Value | Footprint | References |
|---|---|---|---|
| 6 | 10k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R1, R2, R3, R4, R5, R6 |
| 6 | 1nF | Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P5.00mm | C1, C2, C3, C4, C5, C6 |
| 6 | IRF540N | Package_TO_SOT_THT:TO-220-3_Vertical | Q1, Q2, Q3, Q4, Q5, Q6 |
| 3 | 1N4148 | Diode_THT:D_DO-35_SOD27_P7.62mm_Horizontal | D1, D2, D3 |
| 3 | IR2110 | Package_DIP:DIP-14_W7.62mm | U5, U6, U7 |
| 2 | BUTTON | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | BUTT?9, BUTT?10 |
| 1 | 12V | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | B1 |
| 1 | ARDUINO UNO | Module:Arduino_UNO_R3 | U1 |
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Questions
How big is the BLDC PCB?
It measures 123.5 × 132 mm and has 2 copper layers, 1.6 mm thick.
What parts does the BLDC use?
28 parts, built around the IR2110L4 and IRF540N. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the BLDC KiCad files?
From the AssaadMH/sensorless-bldc-control repository on GitHub, at the commit this page was made from: the board is kicad/BLDC/BLDC.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the BLDC design in my own project?
Its repository publishes it under the MIT licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).