I'm looking for a way to have a button that, when pressed, will activate a relay and keep it on for a certain period before turning off—without using an Arduino. Any suggestions or circuits that can help?
3 Answers
You might want to check out time delay relays. They're commonly used in industrial applications and typically have a knob for setting the duration. Just keep in mind these can be pricier than an Arduino option!
You can easily set up a relay to latch itself using just some basic wiring. Make it so the relay keeps getting power when it's activated, and use another button to interrupt that power when you need it to turn off. No fancy chips required for a simple on/off toggle!
Exactly! Sometimes the no-frills route is the best. Just basic components can get the job done.
One solid approach is to use a capacitor to store charge when you press the button. This charge can then power a MOSFET that keeps the relay activated for a predetermined time, based on how you size the capacitor and resistor. Check out this example circuit I found—looks straightforward!
True, but if you want just a basic latch, that might work well without breaking the bank.