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@jywarren jywarren/placeboKit.ino
Last active Feb 19, 2017

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Button turns on one of two fans, randomly. On second press, it reveals which had been on by turning on one of two corresponding LEDs.
/*
Button turns on one of two fans, randomly. On second press, it reveals which
had been on by turning on one of two corresponding LEDs.
The circuit:
* LED A attached from pin D11 to ground
* LED B attached from pin D12 to ground
* fan A attached from pin D2 to ground
* fan B attached from pin D3 to ground
* pushbutton attached to pin 4 from +5V
* 10K resistor attached to pin 4 from ground
Based on:
http://www.arduino.cc/en/Tutorial/Button
*/
// constants won't change. They're used here to
// set pin numbers:
const int buttonPin = 4; // the number of the pushbutton pin
const int ledAPin = 11; // the number of the LED A pin
const int ledBPin = 12; // the number of the LED B pin
const int fanAPin = 2; // the number of the fan A pin
const int fanBPin = 3; // the number of the fan B pin
// variables will change:
int buttonState = 0; // variable for reading the pushbutton status
int state = 2; // state 0 = reset,
// 1 = start A or B fan, switch to state 1 on press
// 2 = show A or B LED, switch to 2 on press
int mode = 0; // mode 0 = LED & fan A, mode 1 = LED and fan B
int buttonPressed = 0; // switch to 0,1 when we detect a change in button state
void setup() {
// initialize serial communications at 9600 bps for debugging
Serial.begin(9600);
// initialize the LED pin as an output:
pinMode(ledAPin, OUTPUT);
pinMode(ledBPin, OUTPUT);
pinMode(fanAPin, OUTPUT);
pinMode(fanBPin, OUTPUT);
// initialize the pushbutton pin as an input:
pinMode(buttonPin, INPUT);
// use noise from a pin to get a better randomness starting point:
randomSeed(analogRead(0));
// initialize all lights on:
digitalWrite(ledAPin, HIGH);
digitalWrite(ledBPin, HIGH);
}
void loop() {
// read the state of the pushbutton value:
buttonState = digitalRead(buttonPin);
// check if the pushbutton is currenty up or down
// and if it's changed since last time, trigger a state change
if (buttonState == HIGH && buttonPressed == 0) {
buttonPressed = 1;
trigger();
delay(100); // wait for a second
} else if (buttonState == LOW) {
buttonPressed = 0;
delay(100); // wait for a second
}
}
// run when button is pressed
void trigger() {
if (state == 1) {
long randNumber = random(100) + 1; // generate random #
// set which mode we're in:
if (randNumber > 49) {
mode = 0;
digitalWrite(fanAPin, HIGH);
digitalWrite(fanBPin, LOW);
} else {
mode = 1;
digitalWrite(fanAPin, LOW);
digitalWrite(fanBPin, HIGH);
}
Serial.println(mode);
state = 2;
digitalWrite(ledAPin, LOW);
digitalWrite(ledBPin, LOW);
} else if (state == 2) {
// display which mode we have been in:
if (mode == 0) {
digitalWrite(ledAPin, HIGH);
digitalWrite(ledBPin, LOW);
} else {
digitalWrite(ledAPin, LOW);
digitalWrite(ledBPin, HIGH);
}
state = 0;
} else if (state == 0) {
// reset
digitalWrite(ledAPin, HIGH);
digitalWrite(ledBPin, HIGH);
digitalWrite(fanAPin, LOW);
digitalWrite(fanBPin, LOW);
state = 1;
}
}
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