(First Post!)
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Similar approach to that of @no smile. Here's the wiring diagram:
Here's a video showing it working:
FullSizeRender.MOV (Size: 2.43 MB )
Code: (disregard anything with regards to LCD - it was just for demonstration purposes):
Even though I'm using two breadboards to do this, half of one would be enough if you omit the LCD.
The usual disclaimer: Try at your own risk, I'm not responsible for anything anyone might do with this. etc.
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Similar approach to that of @no smile. Here's the wiring diagram:
Here's a video showing it working:
FullSizeRender.MOV (Size: 2.43 MB )
Code: (disregard anything with regards to LCD - it was just for demonstration purposes):
Code:
#include <SPI.h>
#include <LiquidCrystal.h>
#define buttonPin 2
#define magnetPin 4
#define duration 5000 // Duration of locked phase in milliseconds (1ms = 1/1000 of a second)
#define preparation 5000 // Duration of preparation phase in ms
unsigned long lastON = 0;
unsigned long timeCounter = duration;
bool finished = false;
LiquidCrystal lcd(9);
byte smiley[8] = {
B00000,
B10001,
B00000,
B00000,
B10001,
B01110,
B00000,
};
void setup() {
pinMode(buttonPin, INPUT_PULLUP);
pinMode(magnetPin, OUTPUT);
digitalWrite(magnetPin,LOW);
Serial.begin(9600);
lcd.createChar(0, smiley);
lcd.begin(16, 2);
lcd.print("Locking in...");
unsigned long now = millis();
while (millis() - now < preparation) {
lcd.setCursor(0, 1);
lcd.print((preparation - (millis() - now))/1000 + 1);
}
digitalWrite(magnetPin, HIGH); // power the magnet
lcd.clear();
lcd.print("Locked! Left:");
lastON = millis();
}
void loop() {
if (timeCounter <= duration && !finished) { // We catch a the absence of a rollover of timeCounter. If there is, it means we passed 0.
if (digitalRead(buttonPin) == LOW) {
timeCounter -= (millis() - lastON); // if the button is pressed, remove from counter the time that passed since the last loop iteration
}
lastON = millis(); // reset the last loop iteration timer
Serial.println(timeCounter / 1000.0);
lcd.setCursor(0, 1);
lcd.print(timeCounter / 1000.0);
} else {
Serial.println("UNLOCK");
lcd.clear();
finished = true;
lcd.print("Unlocked! Hope");
lcd.setCursor(0,1);
lcd.print("you had fun! ");
lcd.write(byte(0));
digitalWrite(magnetPin, LOW); // power off the magnet.
while (true);
}
}Even though I'm using two breadboards to do this, half of one would be enough if you omit the LCD.
The usual disclaimer: Try at your own risk, I'm not responsible for anything anyone might do with this. etc.
