Kids 2 min timer for brushing teeth
It is a pretty simple project, if you have an RTC clock and an Arduino compatible board you can get it done.
Step 1: 3 Steps for full progress
Step 1: Material
1 Sparkfun Redboard (or any Arduino compatible)
1 Seven Segment Display kit
1 RTC DS1307 Clock kit (see Adafruit Tutorial on how to get or build one your self)
1 push button
Some Plexiglass for overall case. I just make a box from it and glue them together. Nothing fancy.
The RTC Clock is put inside an empty dental floss container so I don't have to cover or worry about short circuiting the board inside the case.
Step 2: Setup your connections
Time to get your breadboard out.
I used Sparkfun tutorial here to connect the 7 segment
I am opting for the Serial UART connection.
Similarly I use this Adafruit tutorial for my RTC clock connection with i2C connection
Step 3: Program
/* Serial 7-Segment Display Example Code
Serial Mode Stopwatch
by: Jim Lindblom
SparkFun Electronics
date: November 27, 2012
license: This code is public domain.
This example code shows how you could use software serial
Arduino library to interface with a Serial 7-Segment Display.
There are example functions for setting the display's
brightness, decimals and clearing the display.
The print function is used with the SoftwareSerial library
to send display data to the S7S.
Circuit:
Arduino -------------- Serial 7-Segment
5V -------------------- VCC
GND -------------------- GND
8 -------------------- RX
*/
/*ADDING 2 MINUTE TIMER*/
#include <SoftwareSerial.h>
// These are the Arduino pins required to create a software seiral
// instance. We'll actually only use the TX pin.
const int softwareTx = 8;
const int softwareRx = 7;
int timerbutton = 12;
int timerstart = 0;
SoftwareSerial s7s(softwareRx, softwareTx);
unsigned int counter = 0; // This variable will count up to 65k
char tempString[10],char_hour[2],char_minute[2]; // Will be used with sprintf to create strings
String str_hour,str_minute,str_time;
#include <Wire.h>
#include "RTClib.h"
RTC_DS1307 RTC;
int s7spowerpin = 9;
void setup()
{
pinMode(timerbutton,INPUT_PULLUP);
pinMode(s7spowerpin,OUTPUT);
digitalWrite(s7spowerpin,HIGH);
// Must begin s7s software serial at the correct baud rate.
// The default of the s7s is 9600.
s7s.begin(9600);
// Clear the display, and then turn on all segments and decimals
clearDisplay(); // Clears display, resets cursor
s7s.print("-HI-"); // Displays -HI- on all digits
setDecimals(0b111111); // Turn on all decimals, colon, apos
// Flash brightness values at the beginning
setBrightness(0); // Lowest brightness
delay(1500);
setBrightness(127); // Medium brightness
delay(1500);
setBrightness(255); // High brightness
delay(1500);
// Clear the display before jumping into loop
clearDisplay();
Serial.begin(9600);
Wire.begin();
RTC.begin();
if (! RTC.isrunning()) {
Serial.println("RTC is NOT running!");
// following line sets the RTC to the date & time this sketch was compiled
RTC.adjust(DateTime(__DATE__, __TIME__));
}
}
void loop()
{
DateTime now = RTC.now();
str_hour=String(now.hour(), DEC);
str_minute=String(now.minute(), DEC);\
Serial.println(digitalRead(timerbutton));
if (digitalRead(timerbutton)==LOW) {timerstart=1;}
while (timerstart==1)
{
Serial.println("timer started");
int timer=0;
clearDisplay();
do
{
s7s.print(String(timer));
timer=timer+1;
delay(1000);
clearDisplay();
}
while (timer<=120);
timer=0;
timerstart=0;
}
if (now.hour()>9) {
if (now.minute()>9) {
str_time=str_hour+str_minute;
Serial.println(str_time);
}
}
if (now.hour()>9) {
if (now.minute()<=9) {
str_time=str_hour+"0"+str_minute;
Serial.println(str_time);
}
}
if (now.hour()<9) {
if (now.minute()>9) {
str_time="0"+str_hour+str_minute;
Serial.println(str_time);
}
}
if (now.hour()<9) {
if (now.minute()<9) {
str_time="0"+str_hour+"0"+str_minute;
Serial.println(str_time);
}
}
// Magical sprintf creates a string for us to send to the s7s.
// The %4d option creates a 4-digit integer.
//sprintf(tempString, "%4d", counter);
// This will output the tempString to the S7S
//s7s.print(tempString);
s7s.print(str_time);
setDecimals(0b00000010); // Sets digit 3 decimal on
///counter++; // Increment the counter
delay(1000); // This will make the display update at 10Hz.
}
// Send the clear display command (0x76)
// This will clear the display and reset the cursor
void clearDisplay()
{
s7s.write(0x76); // Clear display command
}
// Set the displays brightness. Should receive byte with the value
// to set the brightness to
// dimmest------------->brightest
// 0--------127--------255
void setBrightness(byte value)
{
s7s.write(0x7A); // Set brightness command byte
s7s.write(value); // brightness data byte
}
// Turn on any, none, or all of the decimals.
// The six lowest bits in the decimals parameter sets a decimal
// (or colon, or apostrophe) on or off. A 1 indicates on, 0 off.
// [MSB] (X)(X)(Apos)(Colon)(Digit 4)(Digit 3)(Digit2)(Digit1)
void setDecimals(byte decimals)
{
s7s.write(0x77);
s7s.write(decimals);
}
Mar 06,2015
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