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/*
Arduino Starter Kit example
Project 11 - Crystal Ball
This sketch is written to accompany Project 11 in the Arduino Starter Kit
Parts required:
- 220 ohm resistor
- 10 kilohm resistor
- 10 kilohm potentiometer
- 16x2 LCD screen
- tilt switch
created 13 Sep 2012
by Scott Fitzgerald
https://store.arduino.cc/genuino-starter-kit
This example code is part of the public domain.
*/
// include the library code:
#include <LiquidCrystal.h>
// initialize the library with the numbers of the interface pins
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
// set up a constant for the tilt switch pin
const int switchPin = 6;
// variable to hold the value of the switch pin
int switchState = 0;
// variable to hold previous value of the switch pin
int prevSwitchState = 0;
// a variable to choose which reply from the crystal ball
int reply;
void setup() {
// set up the number of columns and rows on the LCD
lcd.begin(16, 2);
// set up the switch pin as an input
pinMode(switchPin, INPUT);
// Print a message to the LCD.
lcd.print("Ask the");
// set the cursor to column 0, line 1
// line 1 is the second row, since counting begins with 0
lcd.setCursor(0, 1);
// print to the second line
lcd.print("Crystal Ball!");
}
void loop() {
// check the status of the switch
switchState = digitalRead(switchPin);
// compare the switchState to its previous state
if (switchState != prevSwitchState) {
// if the state has changed from HIGH to LOW you know that the ball has been
// tilted from one direction to the other
if (switchState == LOW) {
// randomly chose a reply
reply = random(8);
// clean up the screen before printing a new reply
lcd.clear();
// set the cursor to column 0, line 0
lcd.setCursor(0, 0);
// print some text
lcd.print("the ball says:");
// move the cursor to the second line
lcd.setCursor(0, 1);
// choose a saying to print based on the value in reply
switch (reply) {
case 0:
lcd.print("Yes");
break;
case 1:
lcd.print("Most likely");
break;
case 2:
lcd.print("Certainly");
break;
case 3:
lcd.print("Outlook good");
break;
case 4:
lcd.print("Unsure");
break;
case 5:
lcd.print("Ask again");
break;
case 6:
lcd.print("Doubtful");
break;
case 7:
lcd.print("No");
break;
}
}
}
// save the current switch state as the last state
prevSwitchState = switchState;
}
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