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Control Zero Classic - M10048 hwrev

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The Control Zero series of flight controllers represents 3DR's commitment to continuous improvement. Our goal with this series was to take every lesson learned from our +10 years of flight controller design and make the best pro-consumer and commercial flight controller on the market. With the Classic form factor, we try to still support the tried and tested Pixhawk 1 form factor and connector set, while bringing a modern feature and sensor set to the table.

Purchase Auto Pilot


Specifications Control Zero Classic
Main Processor 32-bit STM32H743 Cortex M7 core with  DSP and DP-FPU, max frequency 480 MHz
IO Processor No
Flash 2 MB
FRAM module 256kb - for parameters only
Accelerometers / Gyros / Mags 3x Accelerometers / 3x Gyros / 1x Mag
Sensors Invensense/TDK ICM-20602 (6DOF)
Invensense/TDK ICM-20948 (9DoF)
Sensors – Dampened Bosch BMI088 (6DOF) (internally vibration dampened)
Internal Magnetometer AK09916 inside ICM-20948
Barometer Infineon DPS310 barometer (Very smooth and NO light sensitivity)
Interfaces and Protocols 5x UART (serial ports) [2x with HW flow control, 2x GPS+I2C, 1x FRSky Telemetry (D or X types)].

1x PPM sum input signal
12x PWM outputs
1x RSSI (PWM or voltage) input
2x I2C 1x SPI 2x CAN
1x SWD (TC2030 Connector)
Supported RC input protocols:

Spektrum DSM / DSM2 / DSM-X® Satellite compatible input and binding.
Futaba S.BUS® & S.BUS2® compatible input.
FrSky Telemetry port output.
Graupner SUMD. Yuneec ST24.
Mating Connectors DF-13
Pin Headers Yes
Conformal Coating Optional
Notify LED Yes (RGB)
Dimensions Width: 20mm (0.79″)
Length: 35mm (1.38″)
Weight 4.14g (.15 oz)
Mounting Holes No
Case Included
Typical Platforms - Multirotor
- Rover
- Fixed-Wing
- Boats
- Submarines
- Automatic Tractors
- Others
Electrical 5.25V @200mA minimum, 2A recommended
About IO coprocessors

Historically, microcontrollers mounted on Autopilots didn't have enough resources to handle the requirements that industry was demanding. Usually, the features needed to keep up with the trends, pushed manufacturers to add IO coprocessors to increase the number of available timers to generate and decode PWM signals and additional IO Pins. The coprocessor in these hardware architectures is usually connected via a single serial port, reducing the amount of data available in time and introducing more points of failure. However, later generations of hardware have increased IO pin density, timers and reduced size factor, among other enhancements. Additionally, a special benefit also stands out for our design principles, and it is the higher amount and more sophisticated DMAs that work really well with peripherals, transferring high amounts of data and decreasing CPU usage. Besides, we are transitioning from a single MCU architecture to more distributed systems thanks to DroneCAN and Ethernet connectivity (coming soon).

Quick start

The board comes with Ardupilot stable pre-installed from factory. However, the bootloader provides an interoperation layer with PX4 as well, so QGC will be able to detect it and load firmware adequately.

We encourage all customers to run the latest stable version available from your preferred flight stack.


The 3DR Control Classic is compatible with the following firmware:


  • APrelease - compatible with all vehicle types.


PX4 v1.14 support for this board is now available!

  • Releases - compatible with all vehicle types.

Some additional resources:

Top-View Pinout



CAN2 has replaced the I2C port, ignoring this message may damage your board.


Side-View Pinouts



The serial port's default assignment is as follows:

Serial Port name AP Serial
USART8* Additional UART* SERIAL5
USART1** Additional UART** SERIAL6
  • Originally labeled FrSky IN and FrSky OUT*
  • Internal pad RX ONLY**

Connector pin assignments

TELEM1, TELEM2 ports

Pin Signal Volt
1 (red) VDD_5V_Peripheral +5V
2 (blk) TX (OUT) +3.3V
3 (blk) RX (IN) +3.3V
4 (blk) CTS +3.3V
5 (blk) RTS +3.3V
6 (blk) GND GND

GPS ports
This port is intended for combined serial plus I2C GPS units.

Pin Signal Volt
1 (red) VDD_5V_Peripheral +5V
2 (blk) TX (OUT) +3.3V
3 (blk) RX (IN) +3.3V
4 (blk) I2C_SCL +3.3V
5 (blk) I2C_SDA +3.3V
6 (blk) GND GND

ADC 6.6V

Pin Signal Volt
1 (red) VDD_5V_Peripheral +5V
2 (blk) ADC IN up to +6.6V
3 (blk) GND GND

ADC 3.3V

Pin Signal Volt
1 (red) VDD_5V_Peripheral +5V
2 (blk) ADC IN up to +3.3V
3 (blk) GND GND
4 (blk) ADC IN up to +3.3V
5 (blk) GND GND


Pin Signal Volt
1 (red) VDD_5V_Peripheral +5V
2 (blk) CAN_H +12V
3 (blk) CAN_L +12V
4 (blk) GND GND

Custom builds may be needed if you want to change default functionality for UART/SPI 6, this depends on the selected flight stack firmware.

If you have further questions contact us.