The document provides code and instructions for three Arduino projects using an LCD screen:1) A "Hello World" display that prints text to the LCD screen. 2) A weather station that reads temperature and humidity from a sensor and displays the readings.3) An optional "Magic 8 Ball" project that displays random answers when shaken.

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Arduino: Arduino lcd

• 1.
  Arduino: LCDDiagrams &CodeBrown County LibraryProject 01: Hello, World!Components needed: Arduino Uno board breadboard 16 jumper wires 16x2 LCD screen 10k potentiometer
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  5/2018Brown County Library/*LCD01 : Hello World!Source: Code adapted from the Arduino.cc Hello World Tutorial(https://www.arduino.cc/en/Tutorial/HelloWorld)and Adafruit Arduino - Lesson 11. LCD Displays (https://learn.adafruit.com/adafruit-arduino-lesson-11-lcd-displays-1)*/#include <LiquidCrystal.h> // indicate that we want to use the Liquid Crystal library// initialize the library by associating any needed LCD interface pin// with the Arduino pin number that it is connected to// RS EN D4 D5 D6 D7LiquidCrystal lcd(7, 8, 9, 10, 11, 12);void setup() {lcd.begin(16, 2); // set up the LCD's number of columns and rowslcd.print("hello, world!"); // print a message to the LCD}void loop() {lcd.setCursor(0, 1); // set the cursor to column 0, row 1 (row 1 is the second row as counting begins with 0)lcd.print(millis() / 1000); // print the number of seconds since reset}
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  5/2018Brown County LibraryProject02: Weather StationComponents needed: Arduino Uno board breadboard 19 jumper wires 16x2 LCD screen 10k potentiometer DHT11 temperature and humidity sensor
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  5/2018Brown County Library/*LCD02 : Weather StationSource: Code adapted from the Arduino Project Handbook (Geddes, 2016) andladyada's DHT humidity/temperature sensors testing sketch (https://learn.adafruit.com/dht?view=all)*/#include <LiquidCrystal.h> // call the Liquid Crystal library#include <DHT.h> // call the DHT libraryconst int DHTPIN = 3; // pin connected to DHTconst int DHTTYPE = DHT11; // set the type of sensor// initialize the Liquid Crystal library by associating any needed LCD interface pin// with the Arduino pin number that it is connected to// RS E D4 D5 D6 D7LiquidCrystal lcd(7, 8, 9, 10, 11, 12);// initialize the DHT library by telling it the pin and sensor type// pin sensor typeDHT dht(DHTPIN, DHTTYPE);void setup() {dht.begin(); // start the DHT sensorlcd.begin(16, 2); // set up the LCD's number of columns and rows}void loop() {float h = dht.readHumidity(); // get a humidity readingfloat t = dht.readTemperature(); // get a temperature readingt = t * 9 / 5 + 32; // change temp reading from Celsius to Fahrenheitif (isnan(t) || isnan(h)) { // check that DHT sensor is workinglcd.setCursor(0, 0); // set the cursor to column 0, row 0lcd.print("Failed to read from DHT"); // if DHT is not working, display this} else { // otherwise show the readings on the screenlcd.clear();lcd.setCursor(0, 0); // set the cursor to column 0, row 0// display humidity readinglcd.print("Humidity: ");lcd.print(h);lcd.print("%");lcd.setCursor(0, 1); // set the cursor to column 0, row 1// display temperature readinglcd.print("Temp: ");lcd.print(t);lcd.print("f");}delay(1000); // stabilizes the LCD screen}
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  5/2018Brown County LibraryIdeasto Build OnBuild an electronic Magic 8 Ball - ask a question and get an answer when you gently tap or shake yourbreadboard!See page 6 of this document.Try to beat a reaction timer - how quickly can you press a button when a RGB LED flashes red?See page 9 of this document.https://learn.sparkfun.com/tutorials/sik-experiment-guide-for-arduino---v33/experiment-12-driving-a-motorBuild your own time clock, complete with buttons to set the hour and minute!Note: The diagram for this project is a bit confusing – it make take some critical thinking to come up with yourown setup.https://www.hackster.io/Annlee_Fores/simple-arduino-digital-clock-without-rtc-7d4303Learn MoreWant to learn more about how LCD screens and Arduino Libraries work? Try these resources:Adafruit Arduino Lesson 11: LCD Displays Part 1. Simon Monk.https://learn.adafruit.com/adafruit-arduino-lesson-11-lcd-displays-1?view=allAdafruit Arduino Lesson 12: LCD Displays Part 2. Simon Monk.https://learn.adafruit.com/adafruit-arduino-lesson-12-lcd-displays-part-2?view=allAdafruit Tips, Tricks & Techniques: Arduino Libraries. Lady Ada and Tyler Cooper.https://learn.adafruit.com/arduino-tips-tricks-and-techniques/arduino-librariesAdafruit Character LCDs OverView. Lady Ada and Tony DiCola.https://learn.adafruit.com/character-lcds?view=allArduino – Hello World! https://www.arduino.cc/en/Tutorial/HelloWorldArduino – Libraries. https://www.arduino.cc/en/Reference/LibrariesArduino Project Handbook. Mark Geddes. 2016. Pg. 102-132.Exploring Arduino: Tools and Techniques for Engineering Wizardry. Jeremy Blum. 2013. Pg. 199-219.Sparkfun SIK Experiment Guide for Arduino V4.0 – Circuit 4A: LCD “Hello World!”.https://learn.sparkfun.com/tutorials/sparkfun-inventors-kit-experiment-guide---v40/circuit-4a-lcd-hello-world
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  5/2018Brown County LibraryExtraProject: Magic 8 BallComponents needed: Arduino Uno board breadboard 19 jumper wires 16x2 LCD screen 10k potentiometer 220 ohm resistor Tilt switch (four leg)
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  5/2018Brown County Library/*LCDExtra Project : Magic 8 BallSource: Code adapted from the Arduino Projects Book (Fitzgerald, Shiloh & Igoe, 2012)and Arduino Project Handbook (Geddes, 2016)*/#include <LiquidCrystal.h>LiquidCrystal lcd(12, 11, 5, 4, 3, 2);const int switchPin = 6;int switchState = 0;int prevSwitchState = 0;int reply;void setup() {// put your setup code here, to run once:lcd.begin(16, 2);pinMode(switchPin,INPUT);lcd.print("Ask the");lcd.setCursor(0,1);lcd.print("Crystal Ball!");// if analog input pin 0 is unconnected, random analog// noise will cause the call to randomSeed() to generate// different seed numbers each time the sketch runs.// randomSeed() will then shuffle the random function.randomSeed(analogRead(0));}void loop() {// put your main code here, to run repeatedly:switchState = digitalRead(switchPin);if (switchState != prevSwitchState) {if (switchState == LOW) {reply = random(8);lcd.clear();lcd.setCursor(0, 0);lcd.print("The ball says:");lcd.setCursor(0, 1);switch(reply){case 0:lcd.print("Yes");break;case 1:
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  5/2018Brown County Librarylcd.print("Mostlikely");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 a Librarian");break;case 6:lcd.print("Doubtful");break;case 7:lcd.print("No");break;}}}prevSwitchState = switchState;}
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  5/2018Brown County LibraryExtraProject: Reaction TimerComponents needed: Arduino Uno board breadboard 25 jumper wires 16x2 LCD screen 10k potentiometer 4 x 220 ohm resistors Piezo buzzer RGB LED (common cathode) Push button
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  5/2018Brown County Library/*LCDExtra Project : Reaction TimerSource: Code adapted from the Arduino Project Handbook (Geddes, 2016)Originally created by Steven De Lannoyhttp://www.wingbike.nlUsed a RGB LED with a common anode (3 cathodes: R, G, B)*/#include <LiquidCrystal.h>LiquidCrystal lcd(12, 11, 5, 4, 3, 2);int LEDR = 8; // Pin connected to red LEDint LEDB = 6; // Pin connected to blue LEDint LEDGr = 7; // Pin connected to green LEDint Button = 9; // Pin connected to pushbuttonint COLOR; // Variable colorint Beep;int PSE; // Variable pauseint TME; // Timeint RTME = 0; // Reaction timevoid setup() {lcd.begin(16, 2);pinMode(LEDR, OUTPUT); // Set LED pins as outputpinMode(LEDB, OUTPUT);pinMode(LEDGr, OUTPUT);pinMode(Button, INPUT); // Set pushbutton as inputdigitalWrite(LEDR, LOW); // Switch on all LED colorsdigitalWrite(LEDB, LOW);digitalWrite(LEDGr, LOW);}void loop() {lcd.clear(); // Clear screenlcd.print("Hold Button to"); // Display message on LCD screenlcd.setCursor(0, 1); // Move to second linelcd.print("start.");while (digitalRead(Button) == LOW) { // Test does not start until// button is pushed (and held)tone(13, 1200, 30);delay(1400);noTone(13);}lcd.clear();digitalWrite(LEDR, HIGH); // Switch off start lightdigitalWrite(LEDB, HIGH);digitalWrite(LEDGr, HIGH);randomSeed(analogRead(0)); // Random noise from pin 0COLOR = random(1, 4); // Generate random colorPSE = random(500, 1200); // Set random pause duration between lights// Repeat this loop while color is green or blue AND pushbutton// is heldwhile (COLOR != 1 && digitalRead(Button) == HIGH) {digitalWrite(LEDGr, HIGH);digitalWrite(LEDB, HIGH);delay(PSE);randomSeed(analogRead(0));Beep = random(1, 4); // Select random beep from buzzer// (buzzer beeps 1 in 3 times)PSE = random(750, 1200); // Select random pause duration between// lights (to increase surprise effect)if (Beep == 1) {tone(13, 1600, 350);
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  5/2018Brown County Librarydelay(750);noTone(13);}if(COLOR == 2) {digitalWrite(LEDGr, LOW);}if (COLOR == 3) {digitalWrite(LEDB, LOW);}delay(PSE);randomSeed(analogRead(0));COLOR = random(1, 4); // Select random color}// Execute this loop if color is redif (COLOR == 1 && digitalRead(Button) == HIGH) {digitalWrite(LEDGr, LOW);digitalWrite(LEDB, LOW);delay(50);TME = millis(); // Record time since program has starteddigitalWrite(LEDR, HIGH);while (digitalRead(Button) == HIGH) { // Runs until button is// released, recording the// reaction timedelay(1);}lcd.display();RTME = millis() - TME; // Reaction time in millisecondslcd.print("Reaction Time:"); // Display on LCD screenlcd.setCursor(0, 1);lcd.print(RTME);}// Execute if color is NOT red but the pushbutton is releasedif (COLOR != 1) {lcd.print("Released too");lcd.setCursor(0, 1); // Move to second linelcd.print("soon!!!");tone(13, 3000, 1500);delay(500);noTone(13);}// Test does not restart until the button is pushed oncewhile (digitalRead(Button) == LOW) {delay(10);}digitalWrite(LEDR, LOW); // Reset all lights to begin againdigitalWrite(LEDB, LOW);digitalWrite(LEDGr, LOW);lcd.clear();lcd.print("Hold Button to");lcd.setCursor(0, 1);lcd.print("start.");int Time = 0;delay(1000);}