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README
Electronic Speed Controller (ESC)
A high-performance brushless motor controller for drone and robotics applications, featuring advanced PWM control, protection circuits, and thermal-management considerations.
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Specifications

Table

SpecificationValue
Project type40 A BLDC electronic speed controller for quadcopters
Firmware targetBLHeli_S-compatible
Motor type3-phase brushless DC motor
Power stage3 half-bridge MOSFET phases
MOSFETsTPN2R703NL, rated 45 A continuous / 90 A peak
Gate driverMP1907 half-bridge gate driver
MicrocontrollerEFM8BB21F16G-C-QFN20R
Logic rail3.3 V via MCP1755T-3302E/OT
Gate-drive / auxiliary rail12 V via L78L12ABUTR
Board size26 mm × 13 mm
PCB stackup4-layer PCB
Component count158 components
Net count38 nets
Primary applicationQuadcopter propulsion and compact BLDC motor control
Validation statusFlight-tested on a real quadcopter with brushless motors
What This Is
This is a complete Electronic Speed Controller (ESC) design featuring:
  • High-current MOSFET bridge for efficient brushless motor control
  • Advanced PWM control with configurable switching frequencies up to 32 kHz
  • Current sensing with precision shunt resistors for overcurrent protection
  • Temperature monitoring with thermal shutdown protection
  • Back-EMF detection for sensorless motor control and timing optimization
  • Regenerative braking capability for energy recovery during deceleration
  • Configurable input voltage supporting 2S–6S LiPo battery configurations
  • Compact form factor optimized for drone motor mounting
  • Status LED indicators for operational feedback and diagnostics
  • Bootloader-compatible microcontroller for firmware updates via PWM signal
  • EMI filtering to minimize radio-frequency interference
  • Robust protection circuits, including undervoltage, overvoltage, and thermal protection
The controller uses a dedicated motor-control microcontroller optimized for real-time PWM generation and sensor processing. This ensures precise motor timing and smooth operation across the entire RPM range.
Why I Built This
Commercial ESCs often lack transparency in their design and firmware, making customization and optimization difficult. Many also compromise on protection features to reduce cost, which can lead to reliability issues in demanding applications.
This open ESC design provides complete visibility into both hardware and firmware implementation, enabling users to understand, modify, and optimize performance for specific applications. The robust protection circuitry is intended to support reliable operation under extreme conditions.
The design philosophy prioritizes:
  • Efficiency
  • Thermal management
  • Configurability
  • Compatibility with common flight-controller ecosystems
Whether you are building high-performance racing drones, precision camera gimbals, or experimental robotics platforms, this ESC template provides a foundation for reliable motor control without vendor lock-in.
Compatible control protocols include:
  • Standard PWM
  • OneShot
  • DShot
  • Other digital protocols used in modern flight controllers
Full firmware-source access allows custom protocol implementation.
Create New Takes or Improvements
The ESC works as-is. Here are areas where the design could be extended:
  • Telemetry integration — Add bidirectional communication for real-time RPM, temperature, and current feedback to flight controllers.
  • CAN bus variant — Implement CAN bus communication for distributed motor control in larger vehicles and industrial applications.
  • Higher current rating — Scale up MOSFET sizing and thermal management for heavy-lift drone and electric vehicle applications.
  • Integrated sensor support — Add Hall-sensor inputs for precise motor timing in applications requiring guaranteed startup torque.
  • Field-oriented control — Implement advanced control algorithms for maximum efficiency and torque production.
  • Multi-motor version — Control multiple small motors from a single board for specialized applications such as thrust vectoring.
Take it beyond basic speed control. That is the point.
Fork it and make it yours — push the efficiency envelope.
Who This Is For
This project is for people who want to understand motor control at the circuit level, including:
  • Drone builders seeking performance optimization
  • Engineers developing electric vehicles
  • Researchers working on precision motion control
  • Anyone who has looked at a commercial ESC and thought, “I need better thermal management and custom control algorithms.”
It is not meant to replace basic hobby ESCs for standard builds. It is meant to be a development foundation: efficient, reliable, and documented enough to invite improvements and specialization.
If you remix it, I would love to see versions with:
  • Integrated telemetry
  • Higher power ratings
  • Advanced control algorithms
  • Specialized thermal management for extreme environments
The fun part is that the core motor-control capability is already there — the remix space is everything around it.
Performance Analysis and Validation
Recommended validation work includes:
  • Efficiency curves across RPM and load ranges
  • Thermal characterization under sustained high-power operation
  • EMI compliance testing and filtering-effectiveness measurements
  • Protection-circuit response-time analysis
Why This Architecture
This ESC architecture was selected to optimize the critical balance between switching efficiency, thermal performance, and control precision required for modern brushless motor applications while maintaining compatibility with existing drone and robotics control ecosystems.
Configuration and Tuning
Key tuning areas include:
  • PWM-frequency optimization for different motor types
  • Current-limit and protection-threshold setup
  • Timing-advance configuration for performance tuning
  • Thermal-management and derating parameters

  • README

  • Electronic Speed Controller (ESC)

  • Specifications

  • What This Is

  • Why I Built This

  • Create New Takes or Improvements

  • Who This Is For

  • Performance Analysis and Validation

  • Why This Architecture

  • Configuration and Tuning