Does this exist? Kinetic-powered wireless doorbell button that triggers a relay - Page 1
Forum section: electronics / beginners

author: someperson
author_rank: Contributor
timestamp: October 28, 2023, 11:02:59 pm
content: Wireless doorbell systems that have a kinetic-powered button (i.e. no battery) exist, e.g.https://www.amazon.com/gp/product/B0929729L1Wireless relay receivers also exist, e.g.https://www.amazon.com/gp/product/B0B125VLNBThese products often use the 433 MHz band. Are there any that actually work together? If not, is there any relatively simple way to make something like this work? What I really want is a kinetic-powered doorbell button that triggers a relay instead of a chime box.

author: Kim Christensen
author_rank: Super Contributor
timestamp: October 29, 2023, 04:32:21 am
content: Buy the doorbell and modify it to trigger a relay instead of making a noise?You might even be able to put the doorbell in "flash" or "light" only mode and have a circuit that detects the light and triggers your relay if you didn't want to modify the doorbell.

author: BrokenYugo
author_rank: Super Contributor
timestamp: October 29, 2023, 01:43:46 pm
content: Try "self powered light switch", you'll get lots of stuff for switching mains, hack for low voltage use if needed.I would not expect random 433Mhz stuff to work together, best bet is probably to start with a known working TX/RX pair.

author: someperson
author_rank: Contributor
timestamp: October 29, 2023, 05:50:28 pm
content: Quote from: Kim Christensen on October 29, 2023, 04:32:21 amSounds possible, although I honestly have no idea how to go about this. The doorbell makes a noise and flashes a LED when activated. I'm not sure how to turn that into something that can be fed into a momentary relay.Quote from: BrokenYugo on October 29, 2023, 01:43:46 pmHere, the challenge would be that these light switches only output mains voltage and they also latch. Is there some way to adapt this to trigger a momentary relay when switching on or off?

author: Zero999
author_rank: Super Contributor
timestamp: October 29, 2023, 06:39:56 pm
content: The problem is, the transmitter requires power to work, which is only generated when pushing the button. None will be generated whilst the button is being held down.If should be easy to hack a doorbell to trigger a monostable 555 timer from the LED output, but it will always latch on for a predetermined time.

author: someperson
author_rank: Contributor
timestamp: October 29, 2023, 06:51:54 pm
content: Quote from: Zero999 on October 29, 2023, 06:39:56 pmA short time is fine. I basically just want the push of the button to briefly trigger a relay.

author: nali
author_rank: Frequent Contributor
timestamp: October 29, 2023, 08:01:13 pm
content: You can get momentary action switches e.g.https://www.tlc-direct.co.uk/Products/QUR3PM.htmlQuoteI guess they send an ON code followed by an OFF code. Not sure if that's what OP wants or if he wants a timed relay.

author: someperson
author_rank: Contributor
timestamp: October 29, 2023, 08:49:10 pm
content: Quote from: nali on October 29, 2023, 08:01:13 pmHmm, I’m not a big fan of their giant square buttons, but, combined with some kind of relay that runs on line voltage, this looks like the kind of thing I need! Does anyone know if there’s a US supplier of this or something like it? Shipping from the UK isn’t cheap.

author: alligatorblues
author_rank: Regular Contributor
timestamp: October 30, 2023, 06:13:48 am
content: I would convert the the 120VAC to 24V. It's very commonly done, and the transformers are abundant.