Arduino Simple Field Oriented Control (FOC) project v2.2.2

Library Compile License: MIT arduino-library-badge status

We live in very exciting times 😃! BLDC motors are entering the hobby community more and more and many great projects have already emerged leveraging their far superior dynamics and power capabilities. BLDC motors have numerous advantages over regular DC motors but they have one big disadvantage, the complexity of control. Even though it has become relatively easy to design and manufacture PCBs and create our own hardware solutions for driving BLDC motors the proper low-cost solutions are yet to come. One of the reasons for this is the apparent complexity of writing the BLDC driving algorithms, Field oriented control (FOC) being an example of one of the most efficient ones. The solutions that can be found on-line are almost exclusively very specific for certain hardware configuration and the microcontroller architecture used. Additionally, most of the efforts at this moment are still channeled towards the high-power applications of the BLDC motors and proper low-cost and low-power FOC supporting boards are very hard to find today and even may not exist.
Therefore this is an attempt to:

NEW RELEASE 📢: SimpleFOClibrary v2.2.2 see release

  • GenericCurrentSense bugfix and testing
  • bugfix leonardo #170
  • bugfix - no index search after specifying natural direction
  • Low level API restructuring
    • Driver API
    • Current sense API
  • New debugging interface - see in docs
    • Static class SimpleFOCDebug
  • CurrentSense API change - added method linkDriver() - see in docs
  • Low-side current sensing - see in docs
    • ESP32 generic support for multiple motors
    • Added low-side current sensing support for stm32 - only one motor
      • f1 family
      • f4 family
      • g4 family
  • New appraoch for current estimation for torque control using voltage - see in docs
    • Support for motor KV rating - back emf estimation
    • Using motor phase resistance
  • KV rating and phase resistance used for open-loop current limiting as well - see in docs

Arduino SimpleFOClibrary v2.2.2

This video demonstrates the Simple FOC library basic usage, electronic connections and shows its capabilities.


  • Easy install:
    • Arduino IDE: Arduino Library Manager integration
    • PlatformIO
  • Open-Source: Full code and documentation available on github
  • Goal:
    • Support as many sensor + motor + driver + current sense combination as possible.
    • Provide the up-to-date and in-depth documentation with API references and the examples
  • Easy to setup and configure:
  • Cross-platform:
    • Seamless code transfer from one microcontroller family to another
    • Supports multiple MCU architectures:
      • Arduino: UNO, MEGA, DUE, Leonardo ….
      • STM32
      • ESP32
      • Teensy
      • many more …

Arduino SimpleFOCShield v2.0.4


  • Plug & play: In combination with Arduino SimpleFOClibrary - github
  • Low-cost: Price of €15 - Check the pricing
  • In-line current sensing: Up to 3Amps/5Amps bidirectional
    • configurable: 3.3Amps - 3.3V adc, 5Amps - 5V adc
  • Integrated 8V regulator:
    • Enable/disable by soldering pads
  • Max power 120W - max current 5A, power-supply 12-35V
    • Designed for Gimbal motors with the internal resistance >10 Ωs.
  • Stackable: running 2 motors in the same time
  • Encoder/Hall sensors interface: Integrated 3.3kΩ pullups (configurable)
  • I2C interface: Integrated 4.7kΩ pullups (configurable)
  • Configurable pinout: Hardware configuration - soldering connections
  • Arduino headers: Arduino UNO, Arduino MEGA, STM32 Nucleo boards…
  • Open Source: Fully available fabrication files - how to make it yourself

Alternative FOC supporting projects

These are just a few of the alternative FOC supporting projects which provide hardware and software solutions.

✔️ Open Source❌ Open Source✔️ Open Source(recently)✔️ Open Source
✔️Simple to use✔️ Simple to use✔️Simple to use❌ Simple to use
❌ Low cost ($100)❌ Low cost ($100)✔️Low cost ($40)✔️ Low cost
❌ Low power (>50A)✔️ Low power✔️ Low power✔️ Low power
❌ Stepper support❌ Stepper support❌ Stepper support❌ Stepper support