The Diyode Codeshield

A simple sketch that can but used to sound an alarm when a laser beam is interrupted.

Hardware used:

• Button
• Light Sensor
• Piezo

Code Used:

• analogRead
• digitalWrite
• If Statement

/* Diyode CodeShield Constants */
#define ENCODER_A 14
#define ENCODER_B 15
#define ENCODER_PORT PINC
#define SWITCH 13
#define BUTTON 12
#define RGB_RED 11
#define RGB_GREEN 10
#define RGB_BLUE 9
#define LED 6
#define SERVO 5
#define PIEZO 3
#define RELAY 2
#define POT 2
#define HALL 3
#define THERMISTOR 4
#define PHOTOCELL 5

int lowL = -1;
int highL = -1;
int cutoff = 0;
int mode = 0;

void setup() {
    pinMode(RELAY, OUTPUT);
    pinMode(PIEZO, OUTPUT);
}


void loop() {
    if (mode) { //  highLevel and lowLevel have been set
        if (analogRead(PHOTOCELL) < cutoff) {
            startAlarm();
        }
    } else {
        if (digitalRead(BUTTON)) {
            configure();
        }
    }
    delay(40);
}


void startAlarm() {
    analogWrite(PIEZO, 128);
    delay(100);
    digitalWrite(PIEZO,LOW);
    delay(100);
}

void configure() {
    if (lowL == -1) {
        lowL = analogRead(PHOTOCELL);
    } else if (highL == -1) {
        highL = analogRead(PHOTOCELL);
        cutoff = ((lowL+highL)/2);
        mode = 1;
    }
    analogWrite(PIEZO, 128);
    delay(400);
    digitalWrite(PIEZO,LOW);
    delay(1000);
}