Makers,
As a retirement gift I’m trying to re-purpose a piece of old electronics equipment that said retiree used to work on. I want it to display the time where it used to display DC Amps and everything has been going well up to adding button(s) to it. I only want to add it for DST purposes. Once I gift this, it won’t be much good without the ability to adjust the clock.
http://i.imgur.com/IjXmCdyl.jpg
I’m using the DS3234 RTC https://www.sparkfun.com/products/10160 and am having a heck of a time coding for external button functionality to change the time. I’m starting small with one button to increment the minutes, later I’ll add one for the hours.
The bulk of the code comes from the DS3234_RTC_Demo, and Serial 7-Segment Display examples. As far as button example code, I’ve found more info on the DS1307 RTC which uses different libraries and I’m running out of sources or things to try. My coding skill is Rookie.
#include <SPI.h>
#include <SparkFunDS3234RTC.h>
#include <SoftwareSerial.h>
#define DS13074_CS_PIN 10 // DeadOn RTC Chip-select pin
const int softwareTx = 8;
const int softwareRx = 7;
const int minButton = 9; // the number of the pushbutton pin
int minPlus = 0; //sets switches value to off as default
int varMin = 0; //temporary variables for time changing
SoftwareSerial s7s(softwareRx, softwareTx);
char tempString[10]; // Will be used with sprintf to create strings
void setup()
{
// Use the serial monitor to view time/date output
Serial.begin(9600);
s7s.begin(9600);
// Clear the display before jumping into loop
clearDisplay();
rtc.begin(DS13074_CS_PIN);
rtc.autoTime();
pinMode(9, INPUT);
}
void loop()
{
static int8_t lastSecond = -1;
// Call rtc.update() to update all rtc.seconds(), rtc.minutes(),
// etc. return functions.
rtc.update();
if (rtc.second() != lastSecond) // If the second has changed
{
printTime(); // Print the new time
lastSecond = rtc.second(); // Update lastSecond value
}
setTimeManually();
}
void printTime()
{
if (rtc.hour() < 10)
s7s.print('0'); // Print leading '0' for hour
s7s.print(String(rtc.hour())); // Print hour
if (rtc.minute() < 10)
s7s.print('0'); // Print leading '0' for minute
s7s.print(String(rtc.minute())); // Print minute
s7s.print(tempString);
setDecimals(0b00010000); // Sets colon on
delay(1000);
s7s.print(tempString);
setDecimals(0b00000000); // Sets colon off
delay(1000);
}
void clearDisplay()
{
s7s.write(0x76); // Clear display command
}
void setDecimals(byte decimals)
{
s7s.write(0x77);
s7s.write(decimals);
}
void setTimeManually()
{
minPlus = digitalRead(minButton);
while(minPlus == HIGH)
{
varMin = rtc.minute();
varMin++; //add 1 minute from the current time
s7s.print(tempString); //Flash colon quickly while incrementing minutes
setDecimals(0b00010000); // Sets colon on
delay(250);
s7s.print(tempString);
setDecimals(0b00000000); // Sets colon off
delay(250);
}
}
Any help would be greatly appreciated! 
Makers,
While I never got a response here I am sharing my completed simple clock using the SparkFun DeadOn RTC Breakout - DS3234 and Serial 7-Segment Display. The program displays time in 24 hours (or 12 hour) to the S7SD. There are hour up/down, minutes up/down, and a display test button. Time adjust buttons only increment once per press. Any minute adjust will reset the seconds. The colon blinks every second without delay. Big thanks to the arduino.cc forum. The below image is a prototype before I install it in its intended enclosure.
http://i.imgur.com/xJK94OZl.jpg
/* This is a simple clock using the SparkFun DeadOn RTC Breakout - DS3234
* and Serial 7-Segment Display. The program displays time in 24 hours to
* the S7SD. There are hour up/down, minutes up/down, and display test
* buttons. Time adjust buttons only increment once per press. Any minute
* adjust will reset the seconds.*/
#include <SparkFunDS3234RTC.h>
#include <SoftwareSerial.h>
#define DS13074_CS_PIN 10 // DeadOn RTC Chip-select pin
const int softwareTx = 8; //serial pin assignment for 7SD
const int softwareRx = 7;
const int hourUpButton = A0; //push button assignments
const int hourDownButton = A1;
const int minUpButton = A2;
const int minDownButton = A3;
const int testButton = A4;
int addHour = 0; //temporary variables for time changing
int subtractHour = 0;
int addMinute = 0;
int subtractMinute = 0;
int zeroSecond = 0;
int test = 0;
unsigned long previousTime = 0;
const long interval = 1000;
boolean colon = false;
SoftwareSerial s7s(softwareRx, softwareTx);
void setup()
{
Serial.begin(9600); // Baud for serial monitor communication
s7s.begin(9600); // Baud for 7 segment communication
//rtc.set12Hour();
/* Use rtc.set12Hour to set to 12-hour mode.You will need to
* adjust setTimeManually() function so hour adjustments reset
* for a 12 hour clock vs 24.*/
clearDisplay(); // Clear the display before jumping into loop
setBrightness(255); // max brightness
rtc.begin(DS13074_CS_PIN);
//rtc.autoTime(); // Pulls an initial time from IDE's time, comment out once time is set
}
void loop() {
static int8_t lastSecond = -1;
static int8_t lastMinute = -1;
static int8_t lastHour = -1;
// Call rtc.update() to update all rtc.seconds(), rtc.minutes(),
// etc. return functions.
rtc.update();
if (rtc.second() != lastSecond) // If the second has changed
{
printTime(); // Print the new time
lastSecond = rtc.second(); // Update lastSecond value
}
if (rtc.minute() != lastMinute) // If the minute has changed
{
printTime(); // Print the new time
lastMinute = rtc.minute(); // Update lastMinute value
}
if (rtc.hour() != lastHour) // If the hour has changed
{
printTime(); // Print the new time
lastHour = rtc.hour(); // Update lastHour value
}
colonBlink();
setTimeManually();
testDisplay();
} // end loop
//////////FUNCTIONS///////////
void printTime()
{
if (rtc.hour() < 10)
s7s.print('0'); // Print leading '0' for hour
s7s.print(String(rtc.hour())); // Print hour
if (rtc.minute() < 10)
s7s.print('0'); // Print leading '0' for minute
s7s.print(String(rtc.minute())); // Print minute
/*Uncomment to see time on serial monitor
Serial.print(String(rtc.hour()) + ":"); // Print hour
if (rtc.minute() < 10)
Serial.print('0'); // Print leading '0' for minute
Serial.print(String(rtc.minute()) + ":"); // Print minute
if (rtc.second() < 10)
Serial.print('0'); // Print leading '0' for second
Serial.print(String(rtc.second())); // Print second
Serial.println();*/
}
void clearDisplay()
{
s7s.write(0x76); // Clear display command
}
void setDecimals(byte decimals)
{
s7s.write(0x77);
s7s.write(decimals);
}
void setTimeManually()
{
while (digitalRead(hourUpButton) == HIGH)
{
addHour = rtc.hour(); //assign local variable
addHour++; //increment it
if(addHour > 23) //if greater than 23 hours
{
addHour -= 24; //Reset hours to 00
}
rtc.setHour(addHour); //write to RTC
}
while (digitalRead(hourDownButton) == HIGH)
{
subtractHour = rtc.hour(); //assign local variable
subtractHour--; //decrement it
if(subtractHour < 0) //if less than 00 hours
{
subtractHour += 24; //Reset hours to 23
}
rtc.setHour(subtractHour); //write to RTC
}
while (digitalRead(minUpButton) == HIGH)
{
addMinute = rtc.minute(); //assign local variable
zeroSecond = rtc.getSecond(); //when rtc.getSecond is used it increments/decrements continuosly,
//don't know why but I use it to my advantage to zero the seconds with minute changes
addMinute++; //increment it
zeroSecond--; //zero the seconds out
if(addMinute > 59) //if minutes are greater than 59
{
addMinute -= 60; //Reset minutes to 00
}
rtc.setMinute(addMinute); //write to RTC
rtc.setSecond(zeroSecond); //write to RTC (for purposes of seeing on the serial monitor)
}
while (digitalRead(minDownButton) == HIGH)
{
subtractMinute = rtc.minute(); //assign local variable
zeroSecond = rtc.getSecond(); //when rtc.getSecond is used it increments/decrements continuosly,
//don't know why but I use it to my advantage to zero the seconds with minute changes
subtractMinute--; //decrement it
zeroSecond--; //zero the seconds out
if(subtractMinute < 0) //if minutes are less than 00
{
subtractMinute += 60; //Reset minutes and increment hours
}
rtc.setMinute(subtractMinute); //write to RTC
rtc.setSecond(zeroSecond); //write to RTC (for purposes of seeing on the serial monitor)
}
}
void testDisplay() //Test button to light all segments, colon, apostrophe's
{
while (digitalRead(testButton) == HIGH)
{
s7s.print("8888");
setDecimals(0b111111);
}
}
void setBrightness(byte value) //Brightness of S7D
{
s7s.write(0x7A); // Set brightness command byte
s7s.write(value); // brightness data byte
}
void colonBlink()
{
unsigned long currentTime = millis();
if( currentTime - previousTime >= interval)
{
previousTime = currentTime;
if(colon == false)
{
colon = true;
setDecimals(0b00010000);
}
else
{
colon = false;
setDecimals(0b00000000);
}
}
}
