A simple weather station give us temperature & humidity + time. I use a Arduino Uno board as "brain", a DHT11 sensor for humidity and temperature & RTC module with DS1307 for time and values are put on a alphanumeric LCD1602 display. My last schematic is:
Practically, my montage is:
I use this sketch:
// Date and time functions using a DS1307 RTC // original sketck from http://learn.adafruit.com/ds1307-real-time-clock-breakout-board-kit/// add part with SQW=1Hz from http://tronixstuff.wordpress.com/ & http://www.bristolwatch.com/arduino/arduino_ds1307.htm// adapted sketch by niq_ro from http://nicuflorica.blogspot.ro/// original article from http://nicuflorica.blogspot.ro/2013/06/ceas-de-timp-real-rtc-cu-ds1307-si.html
#include <Wire.h>
#include "RTClib.h"// include the library code:
#include <LiquidCrystal.h>
// initialize the library with the numbers of the interface pinsLiquidCrystal lcd(7, 6, 5, 4, 3, 2);
/* ------------------- | LCD | Arduino | ------------------- LCD RS pin to digital pin 7 | RS | D7 | LCD Enable pin to digital pin 6 | E | D6 | LCD D4 pin to digital pin 5 | D4 | D6 | LCD D5 pin to digital pin 4 | D5 | D4 | LCD D6 pin to digital pin 3 | D6 | D3 | LCD D7 pin to digital pin 2 | D7 | D2 | LCD R/W pin to ground | R/W | GND | -------------------*/RTC_DS1307 RTC;
#include <DHT.h>
#define DHTPIN 8 // what pin we're connected DHT11
#define DHTTYPE DHT11 // DHT 11
DHT dht(DHTPIN, DHTTYPE);
byte SW0 = A0;
byte SW1 = A1;
byte SW2 = A2;
// use for hexa in zecimal conversionint zh, uh, ore;
int zm, um, miniti;
voidsetup () {
// DHT init
dht.begin();
// set up the LCD's number of columns and rows:
lcd.begin(16, 2);
// Print a logo message to the LCD.
lcd.print("www.tehnic.go.ro");
lcd.setCursor(0, 1);
lcd.print("creat de niq_ro");
delay (2500);
lcd.clear();
// Serial.begin(9600);Wire.begin();
// part code from http://tronixstuff.wordpress.com/Wire.beginTransmission(0x68);
Wire.write(0x07); // move pointer to SQW addressWire.write(0x10); // sends 0x10 (hex) 00010000 (binary) to control register - turns on square waveWire.endTransmission();
// end part code from http://tronixstuff.wordpress.com/
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__));
}
pinMode(SW0, INPUT); // for this use a slide switchpinMode(SW1, INPUT); // N.O. push button switchpinMode(SW2, INPUT); // N.O. push button switchdigitalWrite(SW0, HIGH); // pull-ups ondigitalWrite(SW1, HIGH);
digitalWrite(SW2, HIGH);
}
voidloop () {
DateTimenow = RTC.now();
int h = dht.readHumidity();
int t = dht.readTemperature();
lcd.setCursor(4, 0);
if ( now.hour() < 10)
{
lcd.print(" ");
lcd.print(now.hour(), DEC);
}
else
{
lcd.print(now.hour(), DEC);
}
lcd.print(":");
if ( now.minute() < 10)
{
lcd.print("0");
lcd.print(now.minute(), DEC);
}
else
{
lcd.print(now.minute(), DEC);
}
lcd.print(":");
if ( now.second() < 10)
{
lcd.print("0");
lcd.print(now.second(), DEC);
}
else
{
lcd.print(now.second(), DEC);
}
lcd.print(" ");
lcd.setCursor(1, 1);
// lcd.print("t=");if ( t < 10)
{
lcd.print(" ");
lcd.print(t);
}
else
{
lcd.print(t);
}
//lcd.print(",0");
lcd.write(0b11011111);
lcd.print("C");
/* lcd.setCursor(0, 1); if ( now.day() < 10) { lcd.print("0"); lcd.print(now.day(), DEC); } else { lcd.print(now.day(), DEC); } lcd.print("/"); if ( now.month() < 10) { lcd.print("0"); lcd.print(now.month(), DEC); } else { lcd.print(now.month(), DEC); } lcd.print("/"); lcd.print(now.year(), DEC); lcd.print(" "); */
lcd.setCursor(10, 1);
// lcd.print("H=");
lcd.print(h);
lcd.print("%RH");
if (!(digitalRead(SW0))) set_time(); // hold the switch to set timedelay(500);
}
void set_time() {
byte minutes1 = 0;
byte hours1 = 0;
byte minutes = 0;
byte hours = 0;
while (!digitalRead(SW0)) // set time switch must be released to exit
{
minutes1=minutes;
hours1=hours;
while (!digitalRead(SW1)) // set minutes
{
minutes++;
// converting hexa in zecimal:
zh = hours / 16;
uh = hours - 16 * zh ;
ore = 10 * zh + uh;
zm = minutes / 16;
um = minutes - 16 * zm ;
miniti = 10 * zm + um;
/* for(int i = 20 ; i >0 ; i--) { displayNumber01(ore*100+miniti); } */
lcd.setCursor(4, 0);
if ( ore < 10)
{
lcd.print(" ");
lcd.print(ore);
}
else
{
lcd.print(ore);
}
lcd.print(":");
if ( miniti < 10)
{
lcd.print("0");
lcd.print(miniti);
}
else
{
lcd.print(miniti);
}
lcd.print(":");
lcd.print("00");
if ((minutes & 0x0f) > 9) minutes = minutes + 6;
if (minutes > 0x59) minutes = 0;
Serial.print("Minutes = ");
if (minutes >= 9) Serial.print("0");
Serial.println(minutes, HEX);
delay(150);
}
while (!digitalRead(SW2)) // set hours
{
hours++;
// converting hexa in zecimal:
zh = hours / 16;
uh = hours - 16 * zh ;
ore = 10 * zh + uh;
zm = minutes / 16;
um = minutes - 16 * zm ;
miniti = 10 * zm + um;
/* for(int i = 20 ; i >0 ; i--) { displayNumber01(ore*100+miniti); } */
lcd.setCursor(4, 0);
if ( ore < 10)
{
lcd.print(" ");
lcd.print(ore);
}
else
{
lcd.print(ore);
}
lcd.print(":");
if ( miniti < 10)
{
lcd.print("0");
lcd.print(miniti);
}
else
{
lcd.print(miniti);
}
lcd.print(":");
lcd.print("00");
if ((hours & 0x0f) > 9) hours = hours + 6;
if (hours > 0x23) hours = 0;
Serial.print("Hours = ");
if (hours <= 9) Serial.print("0");
Serial.println(hours, HEX);
delay(150);
}
Wire.beginTransmission(0x68); // activate DS1307Wire.write(0); // where to beginWire.write(0x00); //secondsWire.write(minutes); //minutesWire.write(0x80 | hours); //hours (24hr time)Wire.write(0x06); // Day 01-07Wire.write(0x01); // Date 0-31Wire.write(0x05); // month 0-12Wire.write(0x09); // Year 00-99Wire.write(0x10); // Control 0x10 produces a 1 HZ square wave on pin 7. Wire.endTransmission();
// converting hexa in zecimal:
zh = hours / 16;
uh = hours - 16 * zh ;
ore = 10 * zh + uh;
zm = minutes / 16;
um = minutes - 16 * zm ;
miniti = 10 * zm + um;
/* for(int i = 20 ; i >0 ; i--) { displayNumber01(ore*100+miniti); } // delay(150); */
lcd.setCursor(4, 0);
if ( ore < 10)
{
lcd.print(" ");
lcd.print(ore);
}
else
{
lcd.print(ore);
}
lcd.print(":");
if ( miniti < 10)
{
lcd.print("0");
lcd.print(miniti);
}
else
{
lcd.print(miniti);
}
lcd.print(":");
lcd.print("00");
}
Like in previous article, if you want to change time, must push and hold SW0 (adjust) switch and display is change on 0:00, then push SW2 (hour) or SW1 (minute) repeatedly until time is ok, after this realise SW0, and time is put in RTC.
For a good clock must use a RTC (real-time clock) like DS1307. For Arduino enthusiasts and hobbylist exists some RTC module with DS1307, but you can made yourself a good RTC module like me.
If you want to change time, must push and hold S3 (adjust) switch and display is change on 0:00, then push S1 (hour) or S2 (minute) repeatedly until time is ok, after this realise S3, and time is put in RTC.