| /* | |
| 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: | |
| // 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; | |
| } | |