source for battery operated keypad switch - Page 1
Forum section: electronics / beginners

author: dorkshoei
author_rank: Frequent Contributor
timestamp: February 07, 2021, 10:31:47 pm
content: We have an inside doorbell switch (2 wire) inside our backdoor that was wired to open the garage door (there is a second switch inside the garage). I disconnected the inside switch as my 5yo kept pressing it and I'd find the garage door had been open all night.My wife would like a way to open it again from inside the house.I'd like to find a battery operated keypad switch where you can enter a 4 or 6 digit code and it will activate the existing momentary switch wiringThe garage opener is old and doesnt have wireless openers.Not opposed to building a kit but my searching has found nothing.

author: Terry Bites
author_rank: Super Contributor
timestamp: February 09, 2021, 06:17:32 pm
content: DIYhttp://www.zen22142.zen.co.uk/ronj/u4.html

author: dorkshoei
author_rank: Frequent Contributor
timestamp: February 09, 2021, 06:45:09 pm
content: Quote from: Terry Bites on February 09, 2021, 06:17:32 pmThanks. Anyone aware of anything off-the-shelf?

author: ledtester
author_rank: Super Contributor
timestamp: February 09, 2021, 06:56:43 pm
content: Here's a battery-powered Access control kit:https://www.aliexpress.com/item/32982189391.htmlThe receiver needs mains power.This "RFID Lock" is battery powered:https://www.amazon.com/WOOCH-RFID-Locks-Cabinets-Hidden/dp/B08DR5WVD5You can put a token near the unit on a spring that only you and your wife can reach.Based on the internal pic, this one looks like it *might* be suitable for battery operation - but you would need to test it:https://www.aliexpress.com/item/32860276160.htmlAnd then there's the "Arduino" DIY solution:https://techatronic.com/password-based-door-lock-system-using-arduino-with-keypad/

author: dorkshoei
author_rank: Frequent Contributor
timestamp: February 09, 2021, 07:03:23 pm
content: Quote from: ledtester on February 09, 2021, 06:56:43 pmThis looks the most interesting when viewed through my "I already have too many other unfinished projects" lensThank you.I wonder if it could function on 9v, not 12v.

author: ledtester
author_rank: Super Contributor
timestamp: February 09, 2021, 07:14:20 pm
content: Here's a battery-powered finger print lock:https://www.amazon.com/dp/B07QWP8YP2Powered by 3 AAA batteries. "Batteries life up to 1 year." But there's also a USB connector you can use to power it (like if the batteries die).QuoteLikely the 12V is regulated down to 5V or 3.3V for the digital circuit. The on-board relay may need a higher voltage. The 12V input is for convenience since most of these systems run on 12V.

author: dorkshoei
author_rank: Frequent Contributor
timestamp: February 09, 2021, 07:29:22 pm
content: $8 for the AliExpress is more in my budget than $45 for the AmazonThanks for the suggestions.

author: ledtester
author_rank: Super Contributor
timestamp: February 10, 2021, 04:10:13 am
content: This one is definitely meant for battery operation:https://www.aliexpress.com/item/4000900057424.htmlRuns off of 6V (4xAAA).

author: dorkshoei
author_rank: Frequent Contributor
timestamp: February 10, 2021, 05:28:33 am
content: Quote from: ledtester on February 10, 2021, 04:10:13 amI wonder what the wiring is from keypad to lock. Looks like 5 wire. Not sure if it can operate as a 2-wire momentary switch?I doubt anyone just sells the keypad but cheap enough to just throw lock away.

author: ledtester
author_rank: Super Contributor
timestamp: February 10, 2021, 06:55:02 am
content: Scroll down and you get this pic of the circuit board and the 6 pin connector.I think the bolt is motor driven and M+ / M- are the connections to the motor.

author: james_s
author_rank: Super Contributor
timestamp: February 10, 2021, 07:02:24 am
content: Another really easy option to consider is a momentary keyswitch, the kind that you insert an actual key into. My grandmother had an early electric opener on her garage and there was a keyswitch like that mounted on the front next to the door.

author: fordem
author_rank: Regular Contributor
timestamp: February 10, 2021, 06:13:04 pm
content: Maybe move the "inside doorbell switch" out of the reach of the five year old?

author: dorkshoei
author_rank: Frequent Contributor
timestamp: February 10, 2021, 06:22:14 pm
content: Quote from: fordem on February 10, 2021, 06:13:04 pmhave you had a 5yo and 7yostep ladders will be involved next, or rube goldberg arrangements of boxes, books etc.

author: dorkshoei
author_rank: Frequent Contributor
timestamp: February 10, 2021, 06:23:06 pm
content: Quote from: ledtester on February 10, 2021, 06:55:02 amRight, but is this compatible with a momentary switch?

author: ledtester
author_rank: Super Contributor
timestamp: February 10, 2021, 06:32:14 pm
content: Quote from: dorkshoei on February 10, 2021, 06:23:06 pmIt's just speculation. You won't really know how it works until you are able to inspect it for yourself.Regardless of what you buy it is very likely you will need to add some custom circuitry.

author: dorkshoei
author_rank: Frequent Contributor
timestamp: February 10, 2021, 07:09:07 pm
content: Quote from: ledtester on February 10, 2021, 06:32:14 pmUnderstood. Thanks for all your help. It's much appreciated.

author: james_s
author_rank: Super Contributor
timestamp: February 12, 2021, 05:12:05 pm
content: Quote from: dorkshoei on February 10, 2021, 06:23:06 pmIf you use it to power the coil of a small relay it is.I would expect that just moving the button up to where a child would require a ladder to reach it is in most cases sufficient, I would not think there would be sufficient draw in opening the garage door to warrant that much effort to circumvent your attempts of preventing it.