Arduino Hand Wave

// senses hand wave movement

// lights
int l1 = 6;
int l2 = 9;
int l3 = 10;
int l4 = 11;

// analog inputs
int i1 = A3;
int i2 = A2;
int i3 = A1;
int i4 = A0;

// voltages at the inputs
float v1;
float v2;
float v3;
float v4;

// array of the order in which pins should dim
int order[] = {0,0,0,0};
int orderCount = 0;

void setup() {
    // run the reset funciton once just to get everything zeroed
    dimSetReset();
    pinMode(l1, OUTPUT);
    pinMode(l2, OUTPUT);
    pinMode(l3, OUTPUT);
    pinMode(l4, OUTPUT);
}

void loop() {
    // we only want to loop when we see a "motion"
    if((analogRead(i1) * .004882814 > 0.30) || (analogRead(i2) * .004882814 > 0.30) || (analogRead(i3) * .004882814 > 0.30) || (analogRead(i4) * .004882814 > 0.30)) {
        // run thru the process a bunch to see what happens
        for(int i = 0; i < 100; ++i) {
            v1 = getvoltage(i1);
            checkvoltage(v1,l1);
            v2 = getvoltage(i2);
            checkvoltage(v2,l2);
            v3 = getvoltage(i3);
            checkvoltage(v3,l3);
            v4 = getvoltage(i4);
            checkvoltage(v4,l4);
            delay(5);
        }

        // we have gone thru the loop, lets see what happens and reset for next time
        dimEnd();
        dimSetReset();
    }
}

// return the voltage that a pin sees using a conversion factor
float getvoltage(int pin) {
    return (analogRead(pin) * 0.004882814);
}

// big function that figures out what order the pins are seeing the voltage in
void checkvoltage(float voltage, int pin) {
    int pinFound = 0;

    // don't do anything unless we see a voltage above the threshold
    if(voltage >= 0.30) {
        // turn the LED on first
        digitalWrite(pin, HIGH);

        // make sure that we havent seen a voltage on the given pin already
        // we don't want to clog up the array
        for(int i = 0; i < 4; ++i) {
            if(order[i] == pin)
                pinFound = 1;
        }

        // if we haven't found a dupicate pin (good) and the order we are at is unfilled (0)
        // then fill the array with the value of the pin that we detected a voltage change at
        if(!pinFound && order[orderCount] == 0) {
            order[orderCount] = pin;
            orderCount++;
        }
    }
}

// dim the specified pin using PWM
void dim(int pin) {
    for(int i = 255; i >= 0; --i) {
        analogWrite(pin, i);
        delay(1);
    }
}

// set the order in which to dim the LEDs and dim them
void dimEnd() {

    // look thru the order array and dim the LEDs in the specified order
    for(int i = 0; i < 4; ++i) {
        switch(order[i]) {
            case 6:
                dim(l1);
                break;
            case 9:
                dim(l2);
                break;
            case 10:
                dim(l3);
                break;
            case 11:
                dim(l4);
                break;
            default:
                break;
        }
    }
}

// reset so we can begin afresh
void dimSetReset() {
    // reset order array
    for(int i = 0; i < 4; ++i) {
        order[i] = 0;
    }

    // start over with what position we are in the order of LEDs
    orderCount = 0;
}