Garage door opener / clicker, how to find a copy? - Page 1
Forum section: electronics / general

author: TheAmmoniacal
author_rank: Unknown
timestamp: May 16, 2014, 12:38:15 pm
content: I live in an apartment complex where we have a shared garage, it can be opened either by a regular key or by a remote. The building administration wants $650 per remote, which I think is a big scam and a ripoff. So we never originally got one, but some years ago "a friend of a friend" said he could make us one for free, and he did. The remote he made is the one we've used ever since, but now it's time to get a second remote and we no longer have contact with him. So I'm thinking of either buying a copy or reverse engineer the board and make a copy myself (it looks very simple).The board is pictured below, and I'm asking for some help in finding one like it to buy, if they are manufactured still? It should be a simple 433 MHz transmitter of a 10 bit code or pin. Unfortunately the marking on the chip has been scratched off, so I can't identify it. But the crystal says "ANS 40.6819" and the rest is just what you see. If you need more details about the components just ask.Summation: Where can I buy a 433 MHz remote with a 10 bit adjustable code? Where can I find a good schematic for one?

author: dexters_lab
author_rank: Unknown
timestamp: May 16, 2014, 01:07:45 pm
content: could you emulate the transmitted code in a mirocontroller coupled with a 433mhz tx module?

author: VK5RC
author_rank: Unknown
timestamp: May 16, 2014, 01:15:45 pm
content: I bought one that could learn fixed (non-rolling) codes from another transmitter from my local electronic supply house (Jaycar). It came with a nice small case as well! I don't know how long the code is though, it was some years ago and have moved since.

author: SeanB
author_rank: Super Contributor
timestamp: May 17, 2014, 04:48:42 pm
content: It is a standard non rolling code remote, using one of 2 protocols. You can buy either a remote of each type and set the DIP switches to match, or go buy one of the learning type remotes. Some need a programmer to program them, others are learning by having an original remote to learn from by placing them next to each other and pressing the button on the learning unit till it flashes, then press the other remote button once and it will learn the code.

author: David_AVD
author_rank: Super Contributor
timestamp: May 17, 2014, 10:41:21 pm
content: Perhaps the transmitter frequency is 40.68MHz ? They are not as common as 433MHz units but they do exist.

author: TheAmmoniacal
author_rank: Unknown
timestamp: May 18, 2014, 06:59:36 am
content: Quote from: David_AVD on May 17, 2014, 10:41:21 pmI never considered that it could be anything other than the standard 433.92 MHz, I don't know much about this stuff though - just assumed there was some sort of amplification of the oscillation. 433.92/40.68 = 10 2/3 hmm...

author: David_AVD
author_rank: Super Contributor
timestamp: May 18, 2014, 08:08:17 am
content: The lower frequency (27MHz and 40MHz) units usually have that large coil whereas the 433MHz (or 315MHz, etc) do not.

author: xwarp
author_rank: Frequent Contributor
timestamp: May 19, 2014, 09:15:36 am
content: Something like this would not work for you?http://www.ebay.com/itm/Hormann-HSE4-40-685-MHz-40-MHz-Remote-Control-Replacement-Clone-Fob-HSM4-UK-/231077217955?pt=LH_DefaultDomain_3&hash=item35cd4686a3#ht_2232wt_1158

author: nihilism
author_rank: Regular Contributor
timestamp: May 19, 2014, 10:38:27 am
content: Looks like an Elsema 27MHz

author: salil
author_rank: Regular Contributor
timestamp: May 19, 2014, 11:39:07 am
content: Quote from: TheAmmoniacal on May 16, 2014, 12:38:15 pm$650?! Ask how much the administration is paying for these and offer to sell them some at ½ that price.It looks like a 2nd gen garage door remote from the 80's/90's. I think they're 300 mhz. At my old apartment they used this so I went to the hardware store and bought one of those universal remotes that reads the code when the gate is activated for $30.http://www.homedepot.com/p/Chamberlain-Clicker-Universal-Remote-Control-KLIK1U/100609179#product_descriptionI wasn't really sure if I was buying the right thing at the time, but I knew I could return it so, I just bought one and it worked out.

author: amyk
author_rank: Super Contributor
timestamp: May 19, 2014, 12:20:00 pm
content: Judging by the package and pinout I'm going to bet it's a Holtek HT12E or one of its many clones.

author: David_AVD
author_rank: Super Contributor
timestamp: May 19, 2014, 08:38:46 pm
content: Since the crystal is marked 40.6819, the coil is large and 40MHz systems used to exist, I still think it's a 40MHz unit.