FidgetReactionTimeTester (alcohol check?)

thingiverse

Switch on the unit and the red light begins glowing brightly. Press the button and the red LED instantly switches off for a random period of time, anywhere from one to five seconds. As soon as that random interval is over, the red LED flickers back on again and you have to act quickly. Your reaction time is measured and translated into a color displayed by the RGBcc LED. Blue (<50ms): You're in top shape! Green (100ms): Time to stop drinking beer, it's not worth the risk. Red (200ms): Call a cab right now and don't get behind the wheel until tomorrow morning. Flashing red (500ms): Forget about driving, you've had one too many beers – it's time to call it a night! Remember, this is just for fun. Don't forget that! Here's an example Arduino sketch for ATtiny that could work: // Reaction Time int Red = 4; int R = 2; int G = 1; int B = 0; int buttonpin = 4; int x; int duration; int randtime; int Val; void setup() { pinMode(Red, OUTPUT); pinMode(R, OUTPUT); pinMode(G, OUTPUT); pinMode(B, OUTPUT); pinMode(buttonpin, INPUT); } void loop() { digitalWrite(Red,HIGH); int randtime = random(50,500); Val = digitalRead(buttonpin); if(Val == LOW){digitalWrite(Red, LOW);} delay(randtime); digitalWrite(Red, HIGH); duration = pulseIn(buttonpin, HIGH); if(duration < 10){digitalWrite(B, HIGH);} if (duration >10 && duration<50){digitalWrite(G, HIGH);} if (duration >50 && duration<100){digitalWrite(R, HIGH);} if (duration >100) { for(x=0;x<10;x++){ digitalWrite(R,HIGH);delay(100);digitalWrite(R, LOW); } } } However, I didn't have the chance to test it yet. Trouble placing the batteries? Heat up the pushpins with a soldering iron and gently press them into the wall.