Simple on/off timed switch

[Raincheck]

Hi,

I'm looking for a simple on/off timed switch, this switch must be fixed to daily 20 hours on and 4 hours off.
Ideally starting at midnight 00:01 (on) to 20.00 (off) daily repeat. 5 to 12V DC to run it and 220V AC 4A switching.

Tried to buy something like this but it's all Chinees bad designed, functioning and unreliable stuff out there.

Would a timer circuit do the trick can you time for 1200 Minutes or 72000 Seconds?

Anybody has a circuit layout with components that could do the job or any other hints and tips to make this happen.

Thanks in advance,
Rain

Ps. no mechanical switch

 

[betwixt]

It depends on how accurate the timing has to be and whether it needs to find out the time for itself.

You can do it with timer circuits but over such long periods it becomes tricky to be accurate as small component tolerances and temperature drift start to become significant. I use timed devices like this but buy Sonoff basic switches and reprogram them for my needs. Its a simple task and they have the power supply internal to them and fed from the un-switched side of the power. My program links to WiFi and sets the clock automatically so it is very precise and the times can be changed remotely.

Brian.

 

[KlausST]

Hi,

There will be many DIY ESPxx projects
as well as the ready to buy HOME automation swtiches which can be programmed for scheduled ON/OFF.

But most of them work with mechanical relays = mechanical switch.

They may be modified to use solid state relays.

Klaus

 

[danadakk]

Over long periods time inaccuracy problem goes away if you use router
derived time, this is fairly simple with ESP8266 or ESP32 -

Getting Date & Time From NTP Server With ESP32

Learn to read Date & Time from NTP Server with ESP32 as a Client along with NTP Working, Architecture, Code with Explanation using Arduino IDE.

lastminuteengineers.com

You would have to write a small amount of code to add the tests for turn on/
turn off and use a SSR to switch the load.


Regards, Dana.

 

[Raincheck]

Hi Guy's,

Thanks for your replies, a mechanical relay (switching 220V 4A) is okay it's just the timing part and it needs to be as small as possible to fit my project and the project uses a 5V to 12V DC power supply. Accuracy: it can be a little bit off but not much. As long as it does the daily 20 hours on and 4 hours off.

I'm able to make/etch my own circuit board if I have a layout and components... (did this about 20 years ago)

Again I've looked online to buy something like this but didn't find something yet...

Thanks again...
Rain

 

[danadakk]

ESP8266 + Relay -

ESP8266 NodeMCU Relay Module - Control AC Appliances (Web Server) | Random Nerd Tutorials

Learn how to use Relay Module with ESP8266 NodeMCU to control AC household appliances using Arduino IDE. You'll also build a web server to control your devices remotely.

randomnerdtutorials.com

with SSR -

Automation With ESP8266 and Solid State Relay

Automation With ESP8266 and Solid State Relay: Today, we’ll discuss a component that isn’t necessarily well-known. However, it’s indispensable for those who enjoy industrial, commercial, or residential automation. This essential component is called the solid state relay. Solid state relays (SSR)…

www.instructables.com

 

[KlausST]

Hi,

do an ebay search "ESP relay module".
Almost every module (I´ve seen) will be suitable.
You need to search for (Arduino) code and maybe modify it for your needs. No rocket science.

Klaus

 

[Raincheck]

Nice one KlausST,

I'm going the ESP relay module/Arduino way will be a learning curve but if it gets me were I want to be it's worth it...

Thanks guy's

 

[danadakk]

Double check the relay ratings, and also check module has protection
diodes for inductive loads on it if thats what you are controlling. Thats
not always obvious in listing.

alliexpress.com and banggood.com all have tons of these for sale.


Regards, Dana.

 

[Easy peasy]

Omron timer ... ? COTS.