Flight controller

Hardware features

✔️ Voltage regulator delivering 3.3 V to the ICs
❌ Battery voltage monitor
- Battery voltage monitor pin PA10 is not connected to a DAC.
✔️ Pulse width modulated power supply of the main and tail rotor motors
❌ Current monitor of the main and tail rotor motors
- Pins PF0 and PF1 are not connected to any operational amplifiers. This makes current sensing inaccurate, since the shunt voltage is quite low.
✔️ PWM control of the swashplate servos
✔️ Programming and debugging interface via SWD and SWO
✔️ Linear acceleration sensor and gyroscope
❌ GPS receiver
- No usable signal from antenna.
- There is no good return path for the antenna signal.
❌ Radio module with support for BLE, LoRa, FLRC, GFSK and ranging
- Untested.
- There is no good return path for the antenna signal.
✔️ RGB status indicator LED
✔️ Overcurrent protection (fuse)

Connect reset pins of other ICs to the microcontroller.
Connect the SX1280 busy pin and multi-purpose digital I/O pins to the microcontroller.
Connect one PIO pin of the GNSS receiver to the microcontroller for TX ready notification.
Add test points to GND, CS, SDI, SDO, SCK, RESET.
Print version number on the PCB.
Remove silk screen labels of small compenents.
Make it possible to manually pull up the BOOT0 pin in case the firmware disrupts SWD communication.
The top internal layer should be a ground plane to ensure a nice return path for the RF signal. Make a six layer board with layers: signal, ground, signal, power, signal, ground.