Hello and Happy new year beforehand!
After getting my DS1307 working beautifully I put together a nice sketch (at least for me) to print out the temperature (from a 1-Wire DS18B20) and the date time (from Lady Ada DSRTC1307 breakout board) by toggling a switch to a serial enabled (by SparkFun serial backpack) 16x2 LCD. Everything works perfect right now, but I would like to change the time format to AM/PM instead of the 24Hrs format. I have looked at the RTClib.h and haven't found a method or functions for this. Maybe I'm not looking at the right place or something but I'm sure there should be a method or library where that should be already implemented. I have used methods/functions from many others around. Also feel free to use it as your heart desires.
Anyway, here's my code (sorry for the coding mess, it's been almost 10 years since I programmed again and it's a wip:
/*
Sketch to print the temperature from a DS18B20 on a 16x2 serial enabled
LCD (SparkFun v2.5) attached to a SparkFun LCD serial backpack. Also prints the
date and time from an AdaFruit RTC 1307 breakout board.
*/
#include <Wire.h> // for easy I2C communications with the RTC
#include <OneWire.h> // OneWire communication library
#include <DallasTemperature.h> // TEmp Sensor DS18B20 library
#include <math.h> // library for math manipulations (might not be needed)
#include <SparkSoftLCD.h> // library to manipulate the LCD
#include "RTClib.h" //Real Time Clock library (by LadyAda)
#define RTC5vPin 17 // pin 17 (analog pin 3) will be used to provide +5v to the RTC
#define RTCgndPin 16 // pin 16 (analog pin 2) will be used to provide GND to the RTC
RTC_DS1307 RTC;
#define LCDtxPin 2 // Using Digital Pin 2 as the Soft Serial Tx output
#define LCD_WIDTH 16 // LCD width definition
#define TempSensor_PIN 14 // Analog Pin 0, digital 14
#define buttonPin 12 // Digital pin 12 for push button
#define LED_PIN 13 // Digital Pin 13 led
float temp; // temperature variable
int decimals = 1; // Decimal precision on the temperature
int gate = 0; // counter to preserve state on push button switch
OneWire oneWire(TempSensor_PIN); // instantiate a OneWire object
DallasTemperature sensors(&oneWire); // instantiate a sensor (DS18B20) object(s)
long interval = 500; // interval in ms to get temperature and print it on LCD
SparkSoftLCD LCD = SparkSoftLCD(LCDtxPin, LCD_WIDTH); // create an LCD object with soft serial on pin 2.
void setup() {
pinMode(LED_PIN, OUTPUT); //sets pin for output
pinMode(RTC5vPin, OUTPUT); //sets Pin for output
digitalWrite(RTC5vPin, HIGH); // turn pin on (5v) to power RTC
pinMode(RTCgndPin, OUTPUT); //sets Pin for output
digitalWrite(RTCgndPin, LOW); // turn pin off to (GND) to power RTC
pinMode(buttonPin, INPUT); //Sets pin for input
Wire.begin(); // Initialize I2C protocol for clock communications
pinMode(LCDtxPin, OUTPUT); // Set defined Pin as an Output Pin for transmission
LCD.begin(9600); // Set baud rate speed to the LCD backpack on the defined Pin
LCD.clear();
RTC.begin();
sensors.begin();
if (! RTC.isrunning()) {
LCD.print("RTC is NOT running!");
// following line sets the RTC to the date & time this sketch was compiled
RTC.adjust(DateTime(__DATE__, __TIME__));
} // end if for RTC adjust
}
void loop(){
if(digitalRead(buttonPin) == LOW){
gate++;
}
if(gate == 0){
digitalWrite(LED_PIN, LOW);
printTemp();
// delay(interval);
}
if(gate == 1){
digitalWrite(LED_PIN, HIGH);
printClock();
gate = 0;
delay(500);
}
}
/***********************************************************************/
/********************** BEGIN RTC FUNCTIONS **************************/
/***********************************************************************/
void printClock(){
DateTime now = RTC.now();
LCD.clear();
LCD.print("Date: ");
LCD.print(now.month(), DEC);
LCD.print('/');
LCD.print(now.day(), DEC);
LCD.print('/');
LCD.print(now.year(), DEC);
LCD.print("Time: ");
LCD.print(now.hour(), DEC);
LCD.print(':');
LCD.print(now.minute(), DEC);
LCD.print(':');
LCD.print(now.second(), DEC);
}
/***********************************************************************/
/********************** END RTC FUNCTIONS **************************/
/***********************************************************************/
/***********************************************************************/
/******************* BEGIN TEMPERATURE FUNCTIONS *********************/
/***********************************************************************/
void printTemp(){
float temp;
sensors.requestTemperatures(); // Send the command to get temperatures
LCD.cursorTo(1,1);
LCD.print("Real Time Temp: ");
LCD.cursorTo(2,1);
temp = sensors.getTempCByIndex(0);
printDouble(temp,decimals); LCD.print((char)223); LCD.print("C ,"); // display in Celsius
temp = sensors.getTempFByIndex(0);
printDouble(temp,decimals); LCD.print((char)223); LCD.print("F "); // display in Fahrenheit
}
void printDouble(double val, byte precision) {
// prints val with number of decimal places determine by precision
// precision is a number from 0 to 6 indicating the desired decimal places
// example: printDouble(3.1415, 2); // prints 3.14 (two decimal places)
LCD.print (int(val)); //prints the int part
if( precision > 0) {
LCD.print("."); // print the decimal point
unsigned long frac, mult = 1;
byte padding = precision -1;
while(precision--) mult *=10;
if(val >= 0) frac = (val - int(val)) * mult; else frac = (int(val) - val) * mult;
unsigned long frac1 = frac;
while(frac1 /= 10) padding--;
while(padding--) LCD.print("0");
LCD.print(frac,DEC) ;
}
}
/***********************************************************************/
/********************** END TEMPERATURE FUNCTIONS ********************/
/***********************************************************************/
