Help with SBUS on Arduino Mega 2560

Projects Programming
1

I'm using the Bolder Flight Systems library with my RadioLink R12DS receiver. I've never done this before, so not sure what I'm doing wrong. The receiver is connected from the SBUS-11 pin to pin 17 (RX2) on my Arduino. I was assuming this was Serial2 from the labels on the board. I can't get the "read()" method to return true. I'm using the code that came with the example. It never gets into the code under the if... read(). Any thoughts?

#include "sbus.h"

/* SBUS object, reading SBUS */
bfs::SbusRx sbus_rx(&Serial2);
/* SBUS data */
bfs::SbusData data;

void setup() {
  /* Serial to display data */
  Serial.begin(115200);
  while (!Serial) {}
  /* Begin the SBUS communication */
  sbus_rx.Begin();
}

void loop () {
  if (sbus_rx.Read()) {
    /* Grab the received data */
    data = sbus_rx.data();
    /* Display the received data */
    for (int8_t i = 0; i < data.NUM_CH; i++) {
      Serial.print(data.ch[i]);
      Serial.print("\t");
    }
  }
}
2

IF you have a serial-USB adapter, use it to validate on the PC your device is working. You can use a 3rd party terminal Prahran or just use the ArduinoIDE serial monitor to observe the characters.

3

I don't have one, unfortunately. I'm new to this. I also tried the library here: https://github.com/fdivitto/sbus but it's only returning 880 as a value every time. No matter where the controller's joysticks are or the switch positions.

1 Like
4

Then I suggest reprogramming your Mega to just show what is being sent... minimal sketch.

You will find overview and sample code here:
Arduino Mega 2560 R3 - Serial Port Basics - Arduino Project Hub

5

i am having the same issue. were you able to solve it later?

EDIT: Okay it works now. Turns out you can not use all the pins as this library uses Timer2 interrupt. Read the library readme.

6

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