IDeATe

Outcome

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Servo servo;

int servoPin = A2;
int switchPin = D5;
int curSwitchState;
int ledPin = D2;

int servoPos;
int first = 1;


void setup()
{
    pinMode( switchPin , INPUT_PULLUP); // sets pin as input
    pinMode( ledPin , OUTPUT ); // sets pin as output
    servo.attach( servoPin );
    servo.write(0);
    servoPos = 0;
    curSwitchState = digitalRead(switchPin);
    Particle.variable("servoPos", servoPos);
    Particle.variable("buttonState", curSwitchState);
    Particle.subscribe("rotate", handleRemoteRotate);
}


// Last time, we wanted to continously blink the LED on and off
// Since we're waiting for input through the cloud this time,
// we don't actually need to put anything in the loop

void loop() {
    int newSwitchState = digitalRead(switchPin);    
    
    if( newSwitchState == LOW ){
        digitalWrite( ledPin, HIGH);
    }else{
        digitalWrite( ledPin, LOW);
    }

    if (curSwitchState != newSwitchState) {
        Particle.publish("triggerRotate");
        rotateServo(); 
        curSwitchState  = newSwitchState;
    }
    
    delay(1000);
}


int handleRemoteRotate(const char *event, const char *data) {
    rotateServo();
    return 1;
}


int rotateServo() {
    if (servoPos == 0) {
        servoPos = 180;
        servo.write(180);
        return 1;
    } else if (servoPos == 180) {
        servoPos = 0;
        servo.write(0);
        return 1;
    } else {
        return -1;
    }
}

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Here is our code to make a subscription of 'rotate' via Webhook. We also added the token of recipient to Webhook in [integrations] on Particle.

Event Name: triggerRotate

{

"name": "rotate",

"data": "hello: {{PARTICLE_EVENT_VALUE}}}",

"private": "true",

"access_token": "{recipient's token}"

}

Move up Delete Move down

Outcome:

In this project, we explored using Webhook to trigger information for rotating servo motors. Since we are three in a pair, we convey the same signal in one way like A to B, B to C, C to A.

Process:

We start experiment with led. By pushing the bottom on each controller, the other's led should be blinking. Then we start to using motor and switch to control and display. Every time the controller's switch pushed, it's motor will rotate and also triggering the other device's motor to rotate.

Next Steps:

As our final project proposed, we are planing to use hall effect sensor and magnet to trigger the rotation of motors.

Reflection:

It was fun to see the series of transferring while telling apart where the servo rotation is triggered from. Once person 'A' switches on the one's circuit board, it directly triggers its servo and in a second conveys the same signal to 'B's servo motor. Once 'B' receives the signal, one can start the triggering to send the signal to one and 'C'. In a row, we could make round signal-transfer-points.