OpenPilot Revolution Nano


The OpenPilot Revolution Nano is a trimmed down version of the Revolution with an updated 10DoF sensor suite.

Aimed at smaller multirotors, helicopters, fixed wing and even ground based models, it retains the full functionality minus the integrated radio modem and some IO of it's bigger brother and is capable of autonomous GPS navigation.

Hardware Description

CPU

Nano is powered by a 32bit STM32F411CEU6 ARM Cortex-M4 microprocessor

Sensor Suite

Nano includes a full 10DoF sensor suite with:

  • Invensense MPU9250 3 axis digital MEMS Gyro, Accelerometer and Magnetometer on a single chip
  • Measurement Specialties MS5611 barometer


Dimensions

    

Connectivity

There are several input and output ports available.

Powering the board

Board can be powered with 4,8-15V DC power supply, usually from one of ESCs integrated BECs or an external 5V BEC. The voltage used to power the board will also power any peripheral devices like GPS, Bluetooth modem,... connected to it.

All input/output (Rx, Tx, PWM, etc.) signal levels are 3,3V (5V tolerant)

All Vcc pins are can be used to power the controller and devices connected to it.

PWM Outputs 1-6

These are PWM outputs used to connect servo motors and ESCs. Outputs 5 and 6 can also be configured as analog inputs

Supported protocols:

  • Standard PWM with configurable rate from 50Hz to 490Hz
  • PWMSync (PWM synchronized to the gyro sampling rate)
  • OneShot125

Pinout:

PWM Out 6

(Analog In ADC5)

PWM Out 5

(Analog In ADC6)

PWM Out 4PWM Out 3PWM Out 2PWM Out 1
VccVccVccVccVccVcc
GNDGNDGNDGNDGNDGND


FlexIO

Primarily used as the receiver port supporting PWM and PPM receivers but can also be used as  up to 6 additional PWM outputs and analog inputs.

The connector used is an 8pin JST-SH.

Pinout:

PinWire ColorPWM InPPM InPWM OutAnalog In
1BlackGND
2RedVcc (4,8-15V DC)
3WhiteChannel 1
PWM Output 7

4BlueChannel 2PPM SumPWM Out 12 (note 1)ADC 0
5YellowChannel 3
PWM Out 8 (note 2)ADC 1
6GreenChannel 4
PWM Out 9 (note 2)ADC 2
7OrangeChannel 5
PWM Out 10 (note 2)ADC 3
8VioletChannel 6
PWM Out 11ADC 4

note 1: Not available if PPM is enabled
note 2: This pin can only work in PWM mode if PPM input is enabled

Main Port

This is a UART serial port with a programmable inverter on the Rx pin. It can be used to connect various serial devices such as GPS receiver, OSD, Telemetry (Bluetooth, OPLink, etc.), S.Bus receiver, DSM satellite receiver...

The connector used is a 4pin JST-SH.

Pinout:

PinWire ColorTelemetryGPSOSDDSMS.Bus
1BlackGND
2RedVcc (4,8-15V DC)
3BlueTx

4OrangeRxDSM InS.Bus In

Flexi Port

This port can support both UART and I2C serial devices, such as external I2C sensors (external magnetometer), GPS, OSD, Telemetry, DSM receiver, SRXL receiver,...

The connector used is a 4pin JST-SH.

Pinout:

PinWire ColorTelemetryGPSOSDDSMSRXLI2C
1BlackGND
2RedVcc (4,8-15V DC)
3BlueTx

SCL
4OrangeRxDSM InSRXL InSDA

USB Port

A standard Micro-B USB connector such as found on most modern cell phones used to connect to the PC.

The flight controller presents itself to the PC as a HID (Human Interface Device) and VCP (Virtual Comm Port) device.

The HID part comes configured for telemetry and is used to configure, update and debug your flight controller.

The VCP can be used for telemetry, debug console and ComBridge functionality which binds Main or Flexi port to be used as a com port from your PC (useful for configuring your OSD without needing to rip it out of your airframe)

This connector will provide power to the processor and sensors but will not power any externally connected devices.

SWD Pads

Serial Wire Debug port can be used by developers to flash and debug firmware on the STM32F4 micro-controller using something like a STM32 Discovery board or ST-Link programmer.

There are serial clock (CK) and data (IO) lines as marked, power and ground can be connected elsewhere.

Normal users should never have to use these port.