Trying to send PPM commands from Arduino Uno to TBS crsfr transmitter help pease?

Projects General Guidance
10

@rangerr,
Is this what you were aiming for?

Amended PPM signal
Amended PPM signal1024×600 9.51 KB

I added a second low going 300µs 'Stop pulse' to show that the Channel pulse has ended.
I split the 'Rest of frame' into two parts, each less than 16383µs.

Here is the revised code:

#define PPM_PIN 9

#define CHANNEL_VALUE 1900  // in microseconds (can change this value)

#define FRAME_LENGTH 22500  // in microseconds (22.5 ms for one frame)

#define PULSE_LENGTH 300    // in microseconds (spacing between channels)

void setup() {
  pinMode(PPM_PIN, OUTPUT);
  digitalWrite(PPM_PIN, HIGH); // idle state HIGH
}

void loop() {
  // Start frame sync pulse (Low)
  digitalWrite(PPM_PIN, LOW);
  delayMicroseconds(PULSE_LENGTH); // Sync pulse length

  // Channel value: High pulse for the actual signal (variable length)
  digitalWrite(PPM_PIN, HIGH);
  delayMicroseconds(CHANNEL_VALUE - PULSE_LENGTH); // pulse for channel

  digitalWrite(PPM_PIN, LOW);   // Added: Stop pulse ends Channel signal
  delayMicroseconds(PULSE_LENGTH);
  digitalWrite(PPM_PIN, HIGH);

  // Rest of frame time (idle between channels)  Now split into two - Each less than 16383µs
  delayMicroseconds(10000);
  delayMicroseconds(FRAME_LENGTH - CHANNEL_VALUE - PULSE_LENGTH - 10000); // Fill the rest of frame

  // Repeat the process
}