Speed Controller with ABT

The Mikrokopter Brushless Speed Controller BL 3.0 and power distribution board with Active Braking Technology provides rapid acceleration and braking of each rotor throughout the system.


PDB, Speed Controller with Active Braking Technology V3 - Dual Quad


  • voltage : 10 to 30V -> 3 -7S Lipo

  • 6 -layer PCB for optimal heat dissipation . 70u copper layers make the entire circuit board to the heat sink .
  • current: up to 60A (per BL-Unit) and 240A (all together) with appropriate cooling
  • current limiting and temperature limiting
  • Active freewheeling -> less power loss

Fast response with speed control

  • The active and seamless braking incorporates precise speed control which reacts to operator inputs more effectively while returning energy to the lipo when braking
  • This Seamless transition from acceleration to braking significantly promotes faster control and better response

Other Features

  • Integrated 12V voltage regulator for external LED-Supply
  • Switchable LED output -> LEDs can flash in case of undervoltage

  • Adjustable motor timing in several steps of 13-28° - compatible with the most common BL motors
  • Adjustable switching frequency ( 10kHz - 20kHz )
  • PPM to 500 Hz with simultaneous I2C - bus operation for telemetry and data logging
  • Integrated 12V stabilization for LED lighting and other 12V appliances
  • Switchable outputs for lighting -> ZB The blinking lights at low voltage

  • Software adjustable direction of rotation
  • Adjustable current and temperature limits
  • Adjustable start-PWM
  • Silent Start: test tone at startup can be disabled


  • various interfaces for setpoint input ( I2C, PPM ( 500Hz ) , serial)
  • Integrated current measurement measurement of the actual current and the used capacity on the Mikrokopter control
  • voltage and temperature measurement with data transmission to the ground station and data logging
  • 11-bit resolution (2048 steps )
  • various feedback to the MikroKopter-FlightCtrl ( blocked motor , power limiting , etc. )

  • extented configuration options (eg current limit , temperature limit , ...)
  • two LEDs per BL-Ctrl (OK and Error )
  • all BLCs are already adressed (address 1-8)
  • I2C bus access possible in PPM mode - for data logging and telemetry in PPM mode
  • status messages are transmitted to the FC ( engine blocks , Current, Self-test error ...)
  • current measurement up to 75A per controller
  • Convenient configuration of the BL controller via FC



(to enlarge - > click on image)


(to enlarge - > click on image)


  • Connection to the FlightCtrl

    • => Use the 5-lines Molex-Cable FlightCtrl

  • LiPo-Connection

    • => LiPo plus / minus 

  • switched LED Stripes connections (4x)(switched by Out1 or Out2 of the flight control)
    • => Plug the gray connector cable int Out1 or Out2 of the FC to use switchable LED-Lights
      = > A / -

  • Stabilized 12V supply
    • => +12V / -

  • Motor 1-4
    • => Motor outputs 1-4 / A, B, C 
      = > Color "Black", "Gray", "Blue" shows how to connect the cables of the MK motors. => You can either solder the cables on the top or the bottom side.

  • Addressing
    • => If you purchase the double-quadro unit in the shop, the BL-Ctrls are already addressed from 1-8. The addresses are marked on the boards
      = > General adressing the BL-Ctrl 

  • LiPo-Voltege outputs (for low currents up to 3A)

    • => plus (LiPo)

  • Optional
    • => Second Recom -> You can add a second voltage converter (for example 5V) 

    • Slave
      • => Not used

  • Buzzer
    • => The buzzer is directly connected to the Board