The estimated reading time for this post is 272 seconds

Here I am again with the timer.

As I explained in the previous post I want to turn on and/or turn off an electrical appliance at 220 V using relays.

I never had any experience in using relays, then at the moment the scheme will include a led.

Here is the schema seen previously with the addition of led connected to PIN 13 Arduino digital:

And here is the code:

#include <Wire.h> #include <String.h> #include "RTClib.h" #define BUFFER_SIZE 20 #define STATE_OFF 0 #define STATE_ON 1 //Giornate di programmazione const int numeroProgrammazioni = 4; String Monday[numeroProgrammazioni] = { "21:35", "20:30","20:35","20:40"}; String Tuesday[numeroProgrammazioni] = { "11:00", "11:35","13:10","13:50"}; String Wednesday[numeroProgrammazioni] = { "20:55", "19:58","20:00","20:05"}; String Thursday[numeroProgrammazioni] = { "10:00", "10:35","17:10","20:00"}; String Friday[numeroProgrammazioni] = { "10:00", "10:35","14:10","15:00"}; String Saturday[numeroProgrammazioni] = { "18:15", "18:20","18:22","18:25"}; String Sunday[numeroProgrammazioni] = { "10:00", "10:35","12:10","15:00"}; //Fine giornate di programmazione RTC_DS1307 rtc; int fsm_state; String START_TIME; String END_TIME; int nSize = numeroProgrammazioni / 2; String giornoTemp[numeroProgrammazioni]; void setup () { //Serial.println("Inizio Setup"); fsm_state = STATE_OFF; Serial.begin(57600); #ifdef AVR Wire.begin(); #else Wire1.begin(); // Shield I2C pins connect to alt I2C bus on Arduino Due #endif rtc.begin(); if (! rtc.isrunning()) { rtc.adjust(DateTime(F(__DATE__), F(__TIME__))); } pinMode(13,OUTPUT); //Collegamento al LED } void loop () { // Ricavo il time attuale DateTime now = rtc.now(); int giorno = now.dayOfWeek(); //0 = Monday 1 = Tuesday 2 = Wednesday .... //Serial.println( giorno); if (giorno == 1){ //Monday memcpy(giornoTemp,Monday, sizeof(Monday)); } else if (giorno == 2){ //Tuesday memcpy(giornoTemp,Tuesday, sizeof(Tuesday)); } else if (giorno == 3){ //Wednesday memcpy(giornoTemp,Wednesday, sizeof(Wednesday)); } else if (giorno == 4){ //Thursday memcpy(giornoTemp,Thursday, sizeof(Thursday)); } else if (giorno == 5){ //Friday memcpy(giornoTemp,Friday, sizeof(Friday)); } else if (giorno == 6){ //Saturday memcpy(giornoTemp,Saturday, sizeof(Saturday)); } else if (giorno == 7){ //Sunday memcpy(giornoTemp,Sunday, sizeof(Sunday)); } //verifico lo stato che dovrà assumere int isON = 0; for (int i= 0; i< nSize;i++){ START_TIME = giornoTemp[i*2]; END_TIME = giornoTemp[(i*2)+1]; isON = setStatus(now,START_TIME,END_TIME); gestisciCarico(isON); } //end for delay(3000); } int setStatus(DateTime timeOra, String START_TIME, String END_TIME) { //recupero l'ora DateTime dSTART_TIME = DateTime(timeOra.year(),timeOra.month(),timeOra.day(),START_TIME.substring(0, 2).toInt(),START_TIME.substring(3, 5).toInt(),0); DateTime dEND_TIME = DateTime(timeOra.year(),timeOra.month(),timeOra.day(),END_TIME.substring(0, 2).toInt(),END_TIME.substring(3, 5).toInt(),0); long lSTART_TIME = dSTART_TIME.unixtime(); long lEND_TIME = dEND_TIME.unixtime(); switch(fsm_state) { case STATE_OFF: if(timeOra.unixtime() > lSTART_TIME && timeOra.unixtime() < lEND_TIME) { fsm_state = STATE_ON; //Serial.println("caso 1"); } break; case STATE_ON: if(timeOra.unixtime() > lEND_TIME) { fsm_state = STATE_OFF; //Serial.println("caso 2"); } break; } return fsm_state; } void gestisciCarico(int isON) { if (isON == 1){ digitalWrite(13,HIGH); } else { digitalWrite(13,LOW); } }

Code explanation:

from line 12 to line 25: setting times of day when turn led

row 47: setting RTC with time and date code compilation

row 50: setting led connection on pin 13

In the loop:

row 55: updating RTC with current day and time

row 57: Getting current day (0= monday, 1 = thusday…).

In this way i can undestand which array I have to use to determine hour settings.

line 86: using the setStatus function to test whether or not turn on the led

row 84: function setStatus: to compare dates using the function unixtime () that converts the date to unix (long): The function returns an int (0/1) 1 turn on led and 0 turn off

line 87: gestisciCarico function: the function takes as input the value previously returned. At this point it is actually switched on led.



This is actually what we wanted: our led will turn on or off in the hours established by us.

The next steps, which I’ll explain soon are:

1. adding a random function (optional): If the random function is activated, I’ll add some random minutes to the hour I decided in array.

2. using relay to turb off or on a 220v bulb.

That’s all.

Happy 2016!

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