The SPRacing F3 Mini design is:
Innovative – New, smart and practical design features.
Flexible – Corners are removable for micro frames, buttons and transponder can be detached and relocated.
Durable – Though-hole connectors for all main I/O for crash-proof installation.
Stackable – Mount to your PDB or OSD.
Compact – Center of PCB measures 36x24mm, main area 36x36mm, transponder section is 36x6mm, entire board just 36x43mm.
Professional – Symmetrical, Neat and Tidy.
The hardware was designed by the lead developer of Cleanflight to be more capable than the previous-generation STM32F1-based boards and to set the benchmark for a fully-featured STM32F3-based mini board.
36x36mm board with 30.5mm mounting holes
Weight ~7 grams
STM32F303 CPU, 72Mhz inc FPU
MicroSD card slot (SD/SDHC, upto 32GB)
5V regulator for powering receiver and small servos
2 Push Buttons
2 IR LEDs and unique code for race transponder
1x 2pin though-holes for pin headers for Direct Connection of 2-5S Battery (25V Max)
8x 3pin though-holes for pin headers for ESC/Servo connections
1x 2pin though-holes for pin headers for UART3
1x 6pin though-holes for pin headers for UART1 and PPM (for standard SerialRX/SBus/PPM lead)
1x 3pin though-holes for pin headers for Telemetry/LED Strip
1x 3pin though-holes for pin headers for Buzzer output
1x 2pin though-holes for pin headers for RSSI and battery current monitoring
1x 3pin though-holes for JST-ZH socket for Spektrum Satellite receivers.
1x 4pin bottom mounted, recessed JST-SH socket for I2C
1x 4pin bottom mounted, recessed JST-SH socket for UART2
1x 4pin top mounted JST-SH socket for SWD debugging
2x bottom mounted solder pads for sonar