SBusTx is a SBUS generator library used to send the 16 proportionnal channels and the 4 flags transported by the SBUS protocol. SBUS protocol is mainly used with Futaba and FrSky receivers. SBusTx can simulates the ouput SBUS signal of a SBUS receiver.

• Simulation of a SBUS RC receiver
• Test of SBUS receiver library such as SBusRx library
• Digital data tranmission over SBUS

All the arduino/micro-controllers equipped with a built-in UART:

• ATtiny167 (Standalone or Digispark pro)
• ATmega368P (UNO)
• ATmega32U4 (Arduino Leonardo, Micro and Pro Micro)
• ATmega2560 (Arduino MEGA)

May work with a Software Serial (not tested).

Develop your project on an arduino MEGA, Leonardo and then shrink it by loading the sketch in an Micro or Pro Micro or ATtiny167.

• *SbusTx.serialAttach(Stream TxStream) With:

  • TxStream: pointer on a serial stream initialized at 100 000 bds, SERIAL_8E2 (eg: &Serial, &Serial1)

• uint8_t SBusTx.isSynchro():

  • SBUS synchronization indicator: indicates that the SBUS frame has just been sent. The channel raw data and/or the channel pulse widths and SBUS flags can be set. This is a "clear on read" function (no need to clear explicitely the indicator).

• uint16_t SBusTx.rawData(uint8_t Ch, uint16_t RawData):

  • This method sets the raw data value associated to the requested channel (Ch: 1 to 16).
  • RawData: raw data value within [0, 2047].

• uint16_t SBusTx.width_us(uint8_t Ch, uint16_t width_us):

  • This method sets the pulse width (in µs) associated to the requested channel (Ch: 1 to 16).
  • width_us: pulse width in µs within [880, 2160].

• uint8_t SBusTx.flags(uint8_t FlagId, uint8_t Value) With:

  • FlagId: the flag identifier among the following choices
  • ** SBUS_TX_CH17**: the status (0/1) of the digital Channel#17
  • ** SBUS_TX_CH18**: the status (0/1) of the digital Channel#18
  • ** SBUS_TX_FRAME_LOST**: the status (0/1) of the frame lost indicator
  • ** SBUS_TX_FAILSAFE**: the status (0/1) of the FailSafe indicator
  • Value: the flag value (0 or 1)

• SBusTx.sendChannels()

  • This method sends the 16 channels and the SBUS flags.

If you have some ideas of enhancement, please contact me by clicking on: RC Navy.