Arduino 18

Arduino Real Time Clock Tutorial using DS1307

Code

	// Date and time functions using a DS1307 RTC connected via I2C and Wire lib
	#include <Wire.h>
	#include <LiquidCrystal.h>
	#include "RTClib.h"
	RTC_DS1307 rtc;
	LiquidCrystal lcd(7, 6, 5, 4, 3, 2); // (rs, e, d4, d5, d6, d7)
	char daysOfTheWeek[7][12] = {"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"};
	void setup ()
	{
	Serial.begin(9600);
	lcd.begin(16, 2);
	if (! rtc.begin())
	{
	lcd.print("Couldn't find RTC");
	while (1);
	}
	if (! rtc.isrunning())
	{
	lcd.print("RTC is NOT running!");
	}
	rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));//auto update from computer time
	//rtc.adjust(DateTime(2014, 1, 21, 3, 0, 0));// to set the time manualy
	}
	void loop ()
	{
	DateTime now = rtc.now();
	lcd.setCursor(0, 1);
	lcd.print(now.hour());
	lcd.print(':');
	lcd.print(now.minute());
	lcd.print(':');
	lcd.print(now.second());
	lcd.print(" ");
	lcd.setCursor(0, 0);
	lcd.print(daysOfTheWeek[now.dayOfTheWeek()]);
	lcd.print(" ,");
	lcd.print(now.day());
	lcd.print('/');
	lcd.print(now.month());
	lcd.print('/');
	lcd.print(now.year());
	}

Arduino 17

Arduino Solar Tracker

Project Code

	#include <Servo.h>
	//defining Servos
	Servo servohori;
	int servoh = 0;
	int servohLimitHigh = 160;
	int servohLimitLow = 20;
	Servo servoverti;
	int servov = 0;
	int servovLimitHigh = 160;
	int servovLimitLow = 20;
	//Assigning LDRs
	int ldrtopl = 2; //top left LDR green
	int ldrtopr = 1; //top right LDR yellow
	int ldrbotl = 3; // bottom left LDR blue
	int ldrbotr = 0; // bottom right LDR orange
	void setup ()
	{
	servohori.attach(10);
	servohori.write(0);
	servoverti.attach(9);
	servoverti.write(0);
	delay(500);
	}
	void loop()
	{
	servoh = servohori.read();
	servov = servoverti.read();
	//capturing analog values of each LDR
	int topl = analogRead(ldrtopl);
	int topr = analogRead(ldrtopr);
	int botl = analogRead(ldrbotl);
	int botr = analogRead(ldrbotr);
	// calculating average
	int avgtop = (topl + topr) / 2; //average of top LDRs
	int avgbot = (botl + botr) / 2; //average of bottom LDRs
	int avgleft = (topl + botl) / 2; //average of left LDRs
	int avgright = (topr + botr) / 2; //average of right LDRs
	if (avgtop < avgbot)
	{
	servoverti.write(servov +1);
	if (servov > servovLimitHigh)
	{
	servov = servovLimitHigh;
	}
	delay(10);
	}
	else if (avgbot < avgtop)
	{
	servoverti.write(servov -1);
	if (servov < servovLimitLow)
	{
	servov = servovLimitLow;
	}
	delay(10);
	}
	else
	{
	servoverti.write(servov);
	}
	if (avgleft > avgright)
	{
	servohori.write(servoh +1);
	if (servoh > servohLimitHigh)
	{
	servoh = servohLimitHigh;
	}
	delay(10);
	}
	else if (avgright > avgleft)
	{
	servohori.write(servoh -1);
	if (servoh < servohLimitLow)
	{
	servoh = servohLimitLow;
	}
	delay(10);
	}
	else
	{
	servohori.write(servoh);
	}
	delay(50);
	}