Hi everyone,
I tried a remake of a project I found on instructables. It is a tea-timer. I have assembled all the parts and uploaded the code to the Arduino Micro. There are no errors whatsoever, it uploaded just fine. However, there seems to be something wrong with the skript, because it turns on the servo moves a little and then nothing... the display turns on and lights up but all that shows is some recktangles.
Another question is, if there is any differnce in using a display with an I2C interface? I tried it both ways, of course with the different connections it requires but either way won't work.
I hope you can help me.
#include <LiquidCrystal_I2C.h>
#include <Servo.h>
//state identifiers:
#define MENU 0
#define INPROCESS 1
#define DONE 2
const String welcomeMessage = ("Hi");
const String doneMessage = ("Done");
const int buttonPin = 4;
const int servoPin = 9;
const int buzzerPin = 8;
const int backlightPin = 3;
const int potPin = A0; // selection potentiometer
const int servoHighPosition = 150;
const int servoLowPosition = 70;
const int servoSpeedDelay = 20; // decrease this value to increase the servo speed
unsigned long steepingTime;
unsigned long startTime;
long timeLeft;
volatile int state;
LiquidCrystal_I2C lcd(0x27,16,2);
Servo servo;
//custom LCD characters:
byte leftArrow[8] = {0,0,4,12,28,12,4,0};
byte rightArrow[8] = {0,0,4,6,7,6,4,0};
byte clock[8] = {0,14,21,23,17,14,0,0};
byte sandTimer[8] = {31,17,10,4,10,31,31,0};
byte teaCup[8] = {10,5,0,31,25,9,15,0};
void setup() {
pinMode(buttonPin, INPUT_PULLUP);
pinMode(buzzerPin, OUTPUT);
pinMode(backlightPin, OUTPUT);
attachInterrupt(0, buttonISR, CHANGE);
servo.attach(servoPin);
digitalWrite(backlightPin, HIGH);
lcd.createChar(0, leftArrow);
lcd.createChar(1, rightArrow);
lcd.createChar(2, clock);
lcd.createChar(3, sandTimer);
lcd.createChar(4, teaCup);
state = MENU;
lcd.begin(16, 2);
lcd.print(welcomeMessage);
}
void loop() {
switch(state){
case MENU: moveServoTo(servoHighPosition);
lcd.clear();
lcd.setCursor(11,1);
lcd.print("start");
lcd.setCursor(8,1);
lcd.write(byte(0)); //display selection arrows
lcd.write(byte(1));
lcd.setCursor(1,0);
lcd.write(byte(2)); //display clock symbol
while(state == MENU){
steepingTime = 30000 * map(analogRead(potPin),0,1023,1,20);
lcd.setCursor(3,0);
lcd.print(millisToTime(steepingTime));
delay(200);
}
break;
case INPROCESS: moveServoTo(servoLowPosition);
startTime = millis();
lcd.clear();
lcd.setCursor(12,1);
lcd.print("stop");
lcd.setCursor(1,0);
lcd.write(byte(3)); //display sand timer symbol
while(state == INPROCESS){
timeLeft = steepingTime - (millis() - startTime);
if(timeLeft > 0){
lcd.setCursor(3,0);
lcd.print(millisToTime(timeLeft));
}
else state = DONE;
delay(500);
}
break;
case DONE: lcd.clear();
lcd.setCursor(1,0);
lcd.print(doneMessage + " ");
lcd.write(byte(4)); //display tea cup symbol
moveServoTo(servoHighPosition);
doneBeep();
lcd.setCursor(12,1);
lcd.print("menu");
while(state == DONE);
break;
}
}
void buttonISR(){
static unsigned long lastInterruptTime = 0; //used to debounce button input
unsigned long interruptTime = millis();
if(interruptTime - lastInterruptTime > 500){ //long debounce time to allow long presses
switch(state){
case MENU: state = INPROCESS;
break;
case INPROCESS: state = MENU;
break;
case DONE: state = MENU;
break;
}
}
lastInterruptTime = interruptTime;
}
void moveServoTo(int finalPosition){ //move the servo slowly to the desired position
int currentPosition = servo.read();
if(finalPosition > currentPosition){
for(int i = currentPosition; i <= finalPosition; i++){
servo.write(i);
delay(servoSpeedDelay);
}
}
else if(finalPosition < currentPosition){
for(int i = currentPosition; i >= finalPosition; i--){
servo.write(i);
delay(servoSpeedDelay);
}
}
}
String millisToTime(long milliseconds){
unsigned long minutes = (milliseconds/1000) / 60;
unsigned long seconds = (milliseconds/1000) % 60;
String minutesString = String(minutes);
String secondsString = String(seconds);
if(minutes < 10) minutesString = "0" + minutesString;
if(seconds < 10) secondsString = "0" + secondsString;
return minutesString + ":" + secondsString;
}
void doneBeep(){
tone(buzzerPin, 4000, 700);
