The SP Racing F3 Flight Controller is still a very popular Flight Controllers today, after long time it was released and even discontinued.
That being said, it’s pretty common to face a situation when you need to wire newer hardware together with SP Racing F3, like VTX Telemetry (like SmartAudio or Tramp), SmartPort from FrSky, and MWOSD for MinimOSD boards.
Don’t forget to enable SOFTSERIAL and TELEMETRY on “Other Features” frame inside “Configuration” tab.
The magic is the Softserial ports. They act like additional UART ports, but with some limitations:
- Maximum Baud Rate is 57600 bps, so you need to Flash MWOSD using this Baud Rate
- For SmartPort, you need to wire both TX and RX wires (pins 5 and 6) together. Wiring only TX pin will not work for SoftSerial
You could wire the MWOSD to the UART1 too… But you would have to disconnect the OSD every time you need to use the Flight Controller USB connection (because it’s shared with UART1). So it can be a problem… Wiring it to the SOFTSERIAL2 makes thinks easier.
Hope you like it. Enjoy!