makeflyeasy PixSurveyA1-IND

../_images/PixSurveyA1-IND.png

The PixSurveyA1-IND flight controller is an upgrade to PixSurveyA1, with better sensors and a better power solution. It is sold by a range of resellers listed on the makeflyeasy(http://www.makeflyeasy.com)

Specifications

  • Processor:

    • 32-bit STM32F427VIT6 ARM Cortex M4 core with FPU

    • 168 Mhz/256 KB RAM/2 MB Flash

    • 32-bit failsafe co-processor (STMF103)

  • Sensors

    • Three redundant IMUs (accels, gyros and compass)

    • Gyro/Accelerometers: two ICM42688-P(SPI), one ICM40605(SPI)

    • Barometers: Two redundant MS5611 barometers

    • Compass: IST8310(internal I2C)

  • Power

    • Redundant power supply with automatic failover

    • Power supply 4V-6V

  • Interfaces

    • 14x PWM servo outputs (8 from IO, 6 from FMU)

    • S.Bus output

    • R/C inputs for CPPM and S.Bus

    • 5x general purpose serial ports

    • 2x I2C ports

    • 2x CAN Bus interface

    • MicroSD card reader

    • Type-C USB

    • High-powered piezo buzzer driver

    • Safety switch / LED

    • Servo rail BEC independent power input for servos

    • 12V Power Output

  • Dimensions

    • Weight 117g

    • Size 110mm x 100mm x 23mm

UART Mapping

  • SERIAL0 -> console (primary mavlink, usually USB)

  • SERIAL1 -> USART2 (telem1,DMA-enabled)

  • SERIAL2 -> USART3 (Telem2,DMA-enabled)

  • SERIAL3 -> UART4 (GPS1)

  • SERIAL4 -> UART8 (GPS2,DMA-enabled)

  • SERIAL5 -> UART7 (USER)

Connector pin assignments

TELEM1, TELEM2 ports

Pin Signal Volt
1 VCC +5V
2 TX (OUT) +3.3V
3 RX (IN) +3.3V
4 GND GND

I2C1, I2C2 ports

PIN SIGNAL VOLT
1 VCC +5V
2 SCL +3.3V
3 SDA +3.3V
4 GND GND

CAN1, CAN2 ports

PIN SIGNAL VOLT
1 VCC +5V
2 CAN_H +12V
3 CAN_L +12V
4 GND GND

Safety and LED port

PIN SIGNAL VOLT
1 VCC +3.3V
2 LED +3.3V
3 SAFKEY +3.3V

GPS1/I2C1, GPS2/I2C2 ports

PIN SIGNAL VOLT
1 VCC +5V
2 TX +3.3V
3 RX +3.3V
4 SCL +3.3V
5 SDA +3.3V
6 GND GND

Serial5 port

Pin Signal Volt
1 VCC +5V
2 TX (OUT) +3.3V
3 RX (IN) +3.3V
4 GND GND

Power1, Power2 ports

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

12V Power Output port

Pin Signal Volt
1 GND GND
2 VCC +12V
3 GND GND

S.BUS Output port

Pin Signal Volt
1 SBUS.out +3.3V
2 NC NC
3 GND GND

RC Input

All compatible RC protocols can be decoded by attaching the Receiver’s output to the SBUS input pin next to the Servo/Output VCC input connector. Note that some protocols such as CRSF or FPort including telemetry, require connection to, and setup of, one of the UARTs instead of this pin.

Compass

The PixSurveyA1-IND has a built-in compass. Due to potential interference, the autopilot is usually used with an external I2C compass as part of a GPS/Compass combination.

PWM Output

The PixSurveyA1-IND supports up to 14 PWM outputs. First first 8 outputs (labelled 1 to 8) are controlled by a dedicated STM32F103 IO controller. These 8 outputs support all PWM output formats, but not DShot.

The remaining 6 outputs (labelled 9 to 14) are the “auxiliary” outputs. These are directly attached to the STM32F427 and support all PWM protocols as well as DShot.

The 8 main PWM outputs are in 3 groups:

  • PWM 1 and 2 in group1

  • PWM 3 and 4 in group2

  • PWM 5, 6, 7 and 8 in group3

The 6 auxiliary PWM outputs are in 2 groups:

  • PWM 1, 2, 3 and 4 in group1

  • PWM 5 and 6 in group2

Channels within the same group need to use the same output rate. If any channel in a group uses DShot then all channels in the group need to use DShot.

Battery Monitor Settings

These should already be set by default. However, if lost or changed:

Enable Battery monitor with these parameter settings :

BATT_MONITOR =4

Then reboot.

BATT_VOLT_PIN 2

BATT_CURR_PIN 3

BATT_VOLT_MULT 18.0

BATT_AMP_PERVLT 24.0

BATT2_VOLT_PIN 14

BATT2_CURR_PIN 13

BATT2_VOLT_MULT 18.0

BATT2_AMP_PERVLT 24.0

DroneCAN capability

There are 2 CAN ports that allow connecting two independent CAN bus outputs. Each of these can have multiple CAN peripheral devices connected.

Loading Firmware

The board comes pre-installed with an ArduPilot compatible bootloader, allowing the loading of xxxxxx.apj firmware files with any ArduPilot compatible ground station.

Firmware for these boards can be found here in sub-folders labeled “PixSurveyA1-IND”.

Where to Buy

makeflyeasy