/* * In the last project, you added a speaker for a noisy alarm. * * Here, you'll be adding in buttons to adjust the time on the clock * without uploading new code to it. * * You'll add two buttons- one to select which part of the * time to change (hour, minute, second), and the other to change it. * The buttons should be on pins 6 and 4.One leg goes in to the signal * pin and the other goes into the GND row. Use your component cards to * better understand how the buttons should hook up. */ #include "MakerScreenXVI.h" MakerScreenXVI lcd; int seconds = 50; int minutes = 59; int hours = 1; bool AMPM = 1; long timer; long beepTimer; int alarmMinute = 00; int alarmHour = 2; bool alarmAMPM = 1; bool alarmState = 0; /* * This holds the record of which part of the time we are changing. * 0 = hours, 1 = minutes, 2 = AMPM. Ignore seconds for now. */ int setTime = 0;//Which portion of time are you setting? 0=H, 1=M, 2=AMPM void setup() { lcd.begin(); lcd.backlightOn(); timer = millis();//set timer equal to the internal counter pinMode(2,OUTPUT); //speaker on pin 2 and GND /* * Button pins are INPUT_PULLUPs. They send a signal (pressed or * unpressed) to the Maker Board. Pressed is LOW, unpressed is HIGH. */ pinMode(6,INPUT_PULLUP); //Button to select which variable you're changing pinMode(4,INPUT_PULLUP); //Button to change the variable's value } void loop() { if (millis() - timer >= 1000){ seconds = seconds + 1; timer = timer + 1000; } /* * Check the buttons to see if they have been * pressed. Check the button on pin 6, which will be the * selection changing one. LOW means the button is pressed. */ if (digitalRead(6) == LOW){ //if button 6 is pressed... /* * A 'while' loop works a bit like an 'if' loop- it checks to see if * the condition in parenthesis is true, and if it is, does the * code in the following block. A while loop is different from * 'if'because 'if' runs it's code block code once per loop, but 'while' * checks its condition again after running. If the condition is still true, * it will run again, creating a loop of itself until the condition is no * longer true. */ while (digitalRead(6) == LOW){//wait for button release... delay(10); } // Change the setTime variable, but keep it in the 0-2 range. setTime = setTime + 1; if (setTime == 3){ //a simple way to keep setTime from going past 2 setTime = 0; } } /* * Check the button on pin 4, which changes the selected time element * if pressed. */ if (digitalRead(4) == LOW){ while (digitalRead(4) == LOW){ delay(10); } if (setTime == 0){ // setTime = 0 means 'hour' is selected hours = hours + 1; if (hours == 13){ // Keep the hours counter in the 1-12 range hours = 1; } } if (setTime == 1){ //setTime = 1 means 'minute' is selected minutes = minutes + 1; if (minutes == 60){ //roll over minutes to 0 when you reach 60 minutes = 0; } } if (setTime == 2){ //setTime = 2 means 'AMPM' is selected AMPM = 1 - AMPM; //swap from AM to PM or PM to AM } } //Check for second rollover if (seconds >= 60){ seconds = seconds - 60; minutes = minutes + 1; alarmState = 0; // Start the beep timer here beepTimer = millis(); } //Check for minute rollover if (minutes >= 60){ minutes = minutes - 60; hours = hours + 1; if (hours == 12){ AMPM = 1 - AMPM; } if (hours == 13){ hours = 1; } } //set the alarm state with this 'if' if ((hours == alarmHour)&&(minutes == alarmMinute)&&(AMPM == alarmAMPM)){ alarmState = 1; } //Print all of the time to the display if the alarm isn't on if (alarmState == 0){ lcd.clear(); lcd.print(hours); lcd.print(":"); if (minutes < 10){ lcd.print("0"); } lcd.print(minutes); lcd.print(":"); if (seconds < 10){ lcd.print("0"); } lcd.print(seconds); if (AMPM == 0){ lcd.print(" AM"); } if (AMPM == 1){ lcd.print(" PM"); } /* * You also want to indicate which of the values is the one * currently selected to change, so after the time, you are * going to display an indicator: HH, MM, AP for which is the * selection */ if (setTime == 0){ lcd.print(" HH"); } if (setTime == 1){ lcd.print(" MM"); } if (setTime == 2){ lcd.print(" AP"); } noTone(2); } else{ lcd.clear(); lcd.print("Wake Up!"); if (millis()-beepTimer < 500){ tone(2,330); } else if (millis()-beepTimer < 1000){ noTone(2); } else{ beepTimer = millis(); } } delay(150); } /* * Now you have a working clock with real-world inputs that allow you to * interact with the code on Maker Board. * * Try to make the changes needed to set the 'second' time with your * buttons. You need to allow setTime to have a value of 3 and create * 'if' statements like those around line 100. Look for the pattern you * can copy. * * In the next lesson, you'll add a third button to set your alarm time * outside the code, too. */ // (c) 2017 Let's Start Coding. License: www.letsstartcoding.com/bsdlicense