pulse-in-dat

code - read RC signal

• RC-link-dat - PPM-dat

• PWM-1ch.ino - PWM-4ch.ino

Basic setup:

Connect the signal wire of each channel (e.g., throttle and elevator) to two digital pins on the Arduino (e.g., D2 and D3).

Use pulseIn() to read the high-pulse duration.

int throttlePin = 2;
int elevatorPin = 3;
unsigned long throttlePWM;
unsigned long elevatorPWM;

void setup() {
    pinMode(throttlePin, INPUT);
    pinMode(elevatorPin, INPUT);
    Serial.begin(9600);
}

void loop() {
    throttlePWM = pulseIn(throttlePin, HIGH, 25000);  // Timeout to prevent lockup
    elevatorPWM = pulseIn(elevatorPin, HIGH, 25000);

    Serial.print("Throttle: ");
    Serial.print(throttlePWM);
    Serial.print(" us, Elevator: ");
    Serial.print(elevatorPWM);
    Serial.println(" us");

    delay(100);  // Limit output rate
}

update into four channels, and add timeout to prevent lockup if a signal is lost.

// Define pins for each RC channel
int aileronPin = 2;   // Channel 1
int elevatorPin = 3;  // Channel 2
int throttlePin = 4;  // Channel 3
int rudderPin = 5;    // Channel 4
// Channel 5 is often unused or for gear/aux, skipping for this example
int flapPitchPin = 6; // Channel 6

// Variables to store PWM values
unsigned long aileronPWM;
unsigned long elevatorPWM;
unsigned long throttlePWM;
unsigned long rudderPWM;
unsigned long flapPitchPWM;

void setup() {
    pinMode(aileronPin, INPUT);
    pinMode(elevatorPin, INPUT);
    pinMode(throttlePin, INPUT);
    pinMode(rudderPin, INPUT);
    pinMode(flapPitchPin, INPUT);
    Serial.begin(9600);
}

void loop() {
    // Read PWM signal for each channel
    // Timeout of 25000 microseconds (25ms) to prevent lockup if a signal is lost
    aileronPWM = pulseIn(aileronPin, HIGH, 25000);
    elevatorPWM = pulseIn(elevatorPin, HIGH, 25000);
    throttlePWM = pulseIn(throttlePin, HIGH, 25000);
    rudderPWM = pulseIn(rudderPin, HIGH, 25000);
    flapPitchPWM = pulseIn(flapPitchPin, HIGH, 25000);

    // Print the values to the Serial Monitor
    Serial.print("Aileron: ");
    Serial.print(aileronPWM);
    Serial.print(" us, Elevator: ");
    Serial.print(elevatorPWM);
    Serial.print(" us, Throttle: ");
    Serial.print(throttlePWM);
    Serial.print(" us, Rudder: ");
    Serial.print(rudderPWM);
    Serial.print(" us, Flap/Pitch: ");
    Serial.print(flapPitchPWM);
    Serial.println(" us");

    delay(100);  // Limit output rate to make it readable
}

Description:

• throttlePWM: Variable to store the duration (in microseconds) of the incoming PWM signal.
• pulseIn(): Arduino function that measures how long a pin stays at a specified level (HIGH or LOW).
• throttlePin: Digital pin receiving the PWM signal (e.g., from an RC receiver).
• HIGH: Measure the duration of the HIGH part of the PWM pulse.
• 25000: Timeout value in microseconds (25 ms). If no pulse is detected within this time, the function returns 0.