Pixracer Overview

The Pixracer is the first autopilot of the new FMUv4 Pixhawk generation. It comes with a small Wifi extension board, upgraded sensors, more flash and better connectors than the original Pixhawk.

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Pixracer V1

Overview

The Pixracer V1 is the first autopilot of the new FMUv4 Pixhawk generation. It has been designed primarily for the demanding requirements of small FPV racing quad multicopters, but of course can be used on planes and other vehicles which require no more than 6 pwm outputs for controlling escs and motors. Pixracer is available from the AUAV shop

Tip

At time of writing the autopilot is still being evolved/improved. The final version may very slightly from the information provided here.

This video below provides a detailed overview of the board. Additional information can be found on pixhawk.org and the AUAV shop.

Specifications

  • Processor:
    • MCU - STM32F427VIT6 rev.3
    • Ultra low noise LDOs for sensors and FMU
    • FRAM - FM25V02-G
  • Sensors
    • Gyro/Accelerometer: Invensense MPU9250 Accel / Gyro / Mag (4 KHz)
    • Gyro/Accelerometer: Invensense ICM-20608 Accel / Gyro (4 KHz)
    • Barometer: MS5611
    • Compass: Honeywell HMC5983 magnetometer with temperature compensation
  • Power
  • Interfaces/Connectivity
    • Wifi: ESP-01 802.11bgn Flashed with MavESP8266
    • MicroSD card reader
    • Micro USB
    • RGB LED
    • GPS (serial + I2C)
    • TELEM1/TELEM2
    • Wifi serial
    • FrSky Telemetry serial
    • Dronecode Debug connector (serial + SWD)
    • Connectors: GPS+I2C, RC-IN, PPM-IN, RSSI, SBus-IN, Spektrum-IN, USART3 (TxD, RxD, CTS, RTS), USART2 (TxD, RxD, CTS, RTS), FRSky-IN, FRSky-OUT, CAN, USART8 (TxD, RxD), ESP8266 (full set), SERVO1-SERVO6, USART7 (TxD, RxD), JTAG (SWDIO, SWCLK), POWER-BRICK (VDD, Voltage, Current, GND), BUZZER-LED_BUTTON.
  • Dimensions
    • Weight ?
    • 36 x 36mm with 30.5 x 30.5mm hole grid with 3.2mm holes

Connector pin assignments

Unless noted otherwise all connectors are JST GH (as required by the Dronecode connector standards).

TELEM1, TELEM2+OSD ports

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

GPS port

PIN SIGNAL VOLT
1 (red) VCC +5V
2 (blk) TX (OUT) +3.3V
3 (blk) RX (IN) +3.3V
4 (blk) I2C1 SCL +3.3V
5 (blk) I2C1 SDA +3.3V
6 (blk) GND GND

FrSky Telemetry / SERIAL4

PIN SIGNAL VOLT
1 (red) VCC +5V
2 (blk) TX (OUT) +3.3V
3 (blk) RX (IN) +3.3V
4 (blk) GND GND

RC Input (accepts PPM / S.BUS / Spektrum / SUMD / ST24)

PIN SIGNAL VOLT
1 (red) VCC +5V
2 (blk) RC IN +3.3V
3 (blk) RSSI IN +3.3V
4 (blk) VDD 3V3 +3.3V
5 (blk) GND GND

CAN

PIN SIGNAL VOLT
1 (red) VCC +5V
2 (blk) CAN_H +12V
3 (blk) CAN_L +12V
4 (blk) GND GND

Power

PIN SIGNAL VOLT
1 (red) VCC +5V
2 (blk) VCC +5V
3 (blk) CURRENT +3.3V
4 (blk) VOLTAGE +3.3V
5 (blk) GND GND
6 (blk) GND GND

Switch

PIN SIGNAL VOLT
1 (red) SAFETY GND
2 (blk) !IO_LED_SAFETY GND
3 (blk) CURRENT +3.3V
4 (blk) BUZZER- -
5 (blk) BUZZER+ -

Dronecode debug port (JST SM06B connector)

PIN SIGNAL VOLT
1 (red) VCC TARGET SHIFT +3.3V
2 (blk) CONSOLE TX (OUT) +3.3V
3 (blk) CONSOLE RX (IN) +3.3V
4 (blk) SWDIO +3.3V
5 (blk) SWCLK +3.3V
6 (blk) GND GND

Note

Some information and images in this page were copied from pixhawk.org, px4.io and the

AUAV shop.