STM32 32-bit microcontroller based 3-axis brushless gimbal controller board

scheme and design by OlliW
layout by Martinez (v0.17) and OlliW (above v0.17)

latest board version: v2.4

the STorM32 BGC boards and all other hardware published here are open source hardware, under the terms of the TAPR Open Hardware License as published by the Free Hardware Foundation, see http://www.tapr.org/ohl.html

the firmwares are free and the GUI is open source, for the details of the terms of usage/licenses see here

further resources:
- project web page http://www.olliw.eu/2013/storm32bgc/
- thread at rcgroups http://www.rcgroups.com/forums/showthread.php?t=2055844
- wiki for the documentation http://www.olliw.eu/storm32bgc-wiki/

changes in v2.4:
- board specifically designed for NT
- only yaw motor drivers on board
- 3 NT plugs to make it easy to connect several NT modules
- NT-X plug carrying also the battery voltage
- 5 V power rail on the NT bus, with sufficient "juice"
- Rx&Tx on NT bus swapped, to avoid cable crossing to connect with NT modules
- support of stacking with a "high-power" extension board
- MPU9250 on board, spi (no i2c anymore!)
- uart1 for UART port, to simplify firmware update procedure
- additional UART#2 port for future purposes
- no BOOT0 button, smaller RESET button
- not all ports routed, but kept those which are most important
- 0402 size parts
- board size as small as I could get it with a 2 layer design: 40 x 25 mm
- mounting holes, 3 mm diameter, 35 mm apart
changes in v1.3:
- voltage regulator in DPak package
- AUX2 instead of 3.3V pin at AUX port
- solder jumper to disconnect bluetooth led
- values of resistors R12,R13,R22 changed
changes in v1.2:
- minor issues of v1.1 corrected
- Futaba S-bus support
- Spektrum sattelite connector
- usb disconnect network modified to suite F4 processors (thanks ala42!)
- usb voltage protection diode added (as in v0.17)
- further minor changes in scheme and layout
changes in v1.1:
- reverse voltage protection added
- layout supports TC4452 motor drivers in DFN package for increased power capabilities
- high-side pnp open collector output for driving an IR led added
- additional connector for I2C#2 port added
- larger solder holes and pads for battery power connection
- improved pin arrangement for easier use

pictures of the v2.4 board

pictures of the v1.2 board (with DFN packages) and v1.3 board (with SOIC packages):