Interfacing 433mhz Remote Control Key FOB - Page 1
Forum section: electronics / general

author: maurosmartins
author_rank: Regular Contributor
timestamp: September 17, 2017, 06:14:44 pm
content: Hello all!For a recent idea that I had I need a remote with one or two keys, the typical electric garage remote would be perfect because of its form factor and price on ebay for example.eBay auction: #http://www.ebay.com/itm/Universal-Electric-Gate-Garage-Door-Remote-Control-Key-FOB-Cloning-Cloner-433mhz-/152435429297?epid=600821686&hash=item237ddc0fb1:g:uY8AAOSw32lYoWiGMy question is, how to interface this (receptor) with a microcontroller and what to expect.Does anybody have done this before? Any help would be good!Thanks in advanced best regards Mauro.

author: PA0PBZ
author_rank: Super Contributor
timestamp: September 17, 2017, 06:43:46 pm
content: I'm not sure what you want to do with it and your link doesn't work for me but I guess this is a remote control made to clone another remote control.If you want something to wireless control a microcontroller it can be done a lot cheaper, see for instance:http://www.ebay.com/itm/433Mhz-RF-Transmitter-And-Receiver-Modules-for-Arduino-ARM-MCU-Remote-Control-/132259659198

author: maurosmartins
author_rank: Regular Contributor
timestamp: September 17, 2017, 07:10:09 pm
content: Hello PA0PBZ,I would like to use one of these to trigger an action, I would like to use it because Of its form factor. I can carry this easilly in my pocket.What I need to know is how to receiver the key press on the microcontroller.Best regards Mauro.

author: MattHollands
author_rank: Frequent Contributor
timestamp: September 18, 2017, 04:39:29 pm
content: Quote from: maurosmartins on September 17, 2017, 07:10:09 pmMost keys operate on 433MHz. I've had a lot of success using the HopeRF RFM69 module. You can find Arduino libraries online and I ported it to the MBED platform on my github.

author: paulcav
author_rank: Contributor
timestamp: September 19, 2017, 08:26:50 am
content: Quote from: maurosmartins on September 17, 2017, 07:10:09 pmHi mauro,Most of these FOB transmitters come with a recieverwith this receiver it will output on one of the pins to correspond to the keypress. It is based on IC2262/2272 chips. IC Datasheethere.Have a lookherefor one that i think will meet your requirements.This is a datasheet that you can usehere

author: maurosmartins
author_rank: Regular Contributor
timestamp: September 19, 2017, 10:57:18 am
content: Hello paulcav and MattHollands, thank you very much for your replies.paulcav, thank you for such complete answer, this helps me a lot, it is very easy to integrate.MattHollands, you are using the RFM69 for "listening" for those key fobs, or you are suggesting using the RFM69 for creating a 433MHz link? if is for creating the link it is not good for me, I would like to use the already existent key fobs because they are cheap and can easily transported in the pocket.Best regards, Mauro.

author: MattHollands
author_rank: Frequent Contributor
timestamp: September 19, 2017, 11:03:08 am
content: Quote from: maurosmartins on September 19, 2017, 10:57:18 amI'm suggesting "listening" for those keyfobs. By putting the RFM69 into OOK mode and setting it to a certain frequency, it will fully decode all data sent on that frequency and output it on a pin. You can look for the correct codes for the buttons. In fact I think you can make the module detect codes itself.

author: paulcav
author_rank: Contributor
timestamp: September 19, 2017, 11:53:16 am
content: If you want to use device with relays you can have an idea with this onehere

author: AlessandroAU
author_rank: Regular Contributor
timestamp: September 22, 2017, 02:20:00 pm
content: Check out my GitHub project:https://github.com/AlessandroAU/ESP8266-433Mhz-and-IR-Bridge-MQTTYou can receive and duplicate those 433mhz OOK/ASK packets with very little hardware. (ESP8266 + 433Mhz modules)