Hey guys,

I’m using a

Arduino Uno
Ultimate breakout GPS V3
7 segment Display

Want to make a alarm clock with GPS

But I want to make the alarm beep every hour on the hour for 5 seconds. For example 1:00,2:00,3:00 etc hits and bam piezo goes off for 5 seconds then turns off
I’m using arduinos sample code for its GPS clock project. I just need to add the alarm code/Alarm hardware to the circuit

Wiring is the same as the sample

Can you guys tell me how to do this?

I’ll be using a piezo buzzer

// Clock example using a seven segment display & GPS for time.
// Must have the Adafruit GPS library installed too! See:
// Designed specifically to work with the Adafruit LED 7-Segment backpacks
// and ultimate GPS breakout/shield:
// ---->
// ---->
// ---->
// ---->
// ---->
// Adafruit invests time and resources providing this open source code,
// please support Adafruit and open-source hardware by purchasing
// products from Adafruit!
// Written by Tony DiCola for Adafruit Industries.
// Released under a MIT license: The MIT License | Open Source Initiative

#include <SoftwareSerial.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_GPS.h>
#include “Adafruit_LEDBackpack.h”

// Set to false to display time in 12 hour format, or true to use 24 hour:
#define TIME_24_HOUR false

// Offset the hours from UTC (universal time) to your local time by changing
// this value. The GPS time will be in UTC so lookup the offset for your
// local time from a site like:
// List of UTC time offsets - Wikipedia
// This value, -7, will set the time to UTC-7 or Pacific Standard Time during
// daylight savings time.
#define HOUR_OFFSET -4

// I2C address of the display. Stick with the default address of 0x70
// unless you’ve changed the address jumpers on the back of the display.
#define DISPLAY_ADDRESS 0x70

// Create display and GPS objects. These are global variables that
// can be accessed from both the setup and loop function below.
Adafruit_7segment clockDisplay = Adafruit_7segment();
SoftwareSerial gpsSerial(8, 7); // GPS breakout/shield will use a
// software serial connection with
// TX = pin 8 and RX = pin 7.
Adafruit_GPS gps(&gpsSerial);

void setup() {
// Setup function runs once at startup to initialize the display and GPS.

// Setup Serial port to print debug output.
Serial.println(“Clock starting!”);

// Setup the display.

// Setup the GPS using a 9600 baud connection (the default for most
// GPS modules).

// Configure GPS to onlu output minimum data (location, time, fix).

// Use a 1 hz, once a second, update rate.

// Enable the interrupt to parse GPS data.

void loop() {
// Loop function runs over and over again to implement the clock logic.

// Check if GPS has new data and parse it.
if (gps.newNMEAreceived()) {

// Grab the current hours, minutes, seconds from the GPS.
// This will only be set once the GPS has a fix! Make sure to add
// a coin cell battery so the GPS will save the time between power-up/down.
int hours = gps.hour + HOUR_OFFSET; // Add hour offset to convert from UTC
// to local time.
// Handle when UTC + offset wraps around to a negative or > 23 value.
if (hours < 0) {
hours = 24+hours;
if (hours > 23) {
hours = 24-hours;
int minutes = gps.minute;
int seconds = gps.seconds;

// Show the time on the display by turning it into a numeric
// value, like 3:30 turns into 330, by multiplying the hour by
// 100 and then adding the minutes.
int displayValue = hours*100 + minutes;

// Do 24 hour to 12 hour format conversion when required.
if (!TIME_24_HOUR) {
// Handle when hours are past 12 by subtracting 12 hours (1200 value).
if (hours > 12) {
displayValue -= 1200;
// Handle hour 0 (midnight) being shown as 12.
else if (hours == 0) {
displayValue += 1200;

// Now print the time value to the display.
clockDisplay.print(displayValue, DEC);

// Add zero padding when in 24 hour mode and it’s midnight.
// In this case the print function above won’t have leading 0’s
// which can look confusing. Go in and explicitly add these zeros.
if (TIME_24_HOUR && hours == 0) {
// Pad hour 0.
clockDisplay.writeDigitNum(1, 0);
// Also pad when the 10’s minute is 0 and should be padded.
if (minutes < 10) {
clockDisplay.writeDigitNum(2, 0);

// Blink the colon by turning it on every even second and off
// every odd second. The modulus operator is very handy here to
// check if a value is even (modulus 2 equals 0) or odd (modulus 2
// equals 1).
clockDisplay.drawColon(seconds % 2 == 0);

// Now push out to the display the new values that were set above.

// Loop code is finished, it will jump back to the start of the loop
// function again! Don’t add any delays because the parsing needs to
// happen all the time!

// Use a timer interrupt once a millisecond to check for new GPS data.
// This piggybacks on Arduino’s internal clock timer for the millis()
// function.;

void enableGPSInterrupt() {
// Function to enable the timer interrupt that will parse GPS data.
// Timer0 is already used for millis() - we’ll just interrupt somewhere
// in the middle and call the “Compare A” function above
OCR0A = 0xAF;


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