Scheduling relays to open/close

Hey Everyone ,

For my project I have 4 channel relay would like channel 1 to turn on at 5 pm and off at 6 pm on Monday. For a length of a hour.

Channel 2 to turn on at 5 pm and off 6 pm on Tuesday.

Channel 3 to turn on at 5 pm and off 6 pm on Wednesday.

Channel 4 to turn on at 5 pm and off 6 pm on Thursday.

1.) No two relays will be on at the same time.
2.) The start time and stop times are the same.
3.) Only the day of the week and relay number changes.
4.) If there is a power outage, the program must sense the correct day and time so it will resume power to the correct relay and not wait for the next cycle.

Can someone point me in the right direction, share a link or video that would help me on this project?

Item list

UNO WIFI REV2

Adafruit PCF8523 Real Time Clock Assembled Breakout Board

ELEGOO 8 Channel DC 5V Relay Module

4 Port USB Hub

Top Replies

beacon_dave over 4 years ago

Adafruit have a tutorial guide on the PCF8523 RTC which would be worth taking a look at:
https://learn.adafruit.com/adafruit-pcf8523-real-time-clock

That shows you how to set the time, and then how to read the time from then on using the RTClib library, so half-way there.

now.dayOfTheWeek() will return you the weekday number
and
now.hour() will return you the hour

By using them, you can determine which relays need to be toggled as per your schedule.
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phoenixcomm over 4 years ago

obzrve this is straight forward.. As beacon_dave suggested use the RTC kit from Adafruit. A little snooping with Google I found the diagram.
**** CAUTION *** even though the Relays are rated at 16amp at 250 volts. they are other ways to skin the cat. I use this same setup to run lamps in
flight simulator normally 24 v @ < 1 amp.
BTW most of the I will use a Relay Board with an I²C interface.
~~ Cris.
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