Wireless entry with a key fob

Hardware
1

I currently have August smart lock that I would like to integrate a key fob or wireless remote to unlock it. I had a Aeotec nanomote, but I didn’t like the bulkiness and sometime the connection would drop. So here are a few options I thought of:

  1. Sonof rf bridge as a receiver and using a key fob. I was going to try an use the simplisafe key fob since it uses 433mhz, but I worried about security and someone sniffing the code. I thought possibly to set it up where it would unlock once my phone was connected to wifi.
  2. The option was trying this method. Using 12v remote with gpio to add keyfob to automations.
  3. Looking for a wifi key fob, but i haven’t found anything.

I’m open to suggestion.

2

Unless you use a rolling code system made by your own, I will not use 433mhz to unlock a door or an alarm.

You could indeed reduce the risk by checking a phone or a beacon presence.

But at final it is more a question of risk taking versus benefits (accidental unlocking, programming errors…) and what you wilk earn by setting this system.

3

For knowledge purpose are there any articles on this.

I appreciate your input. You have any other suggestions on how I could accomplish putting a key fob?

4

Not as a first though, you would need to search yourself but be ready to spend some times on it.

Despite the high security risk pointed above, you can take every 433mhz remote

Another option could be to use your smartphone with a VPN or remote connection to your HASS instance, this is less risky.

5

Again, Thanks for the feedback this was helpful!

6

I purchased this and hook up the relays to my wemos D1 mini. Also there was a 5V output on the garage door opener that I used to turn on the wemos using the 5V input pin. I have an automation where it unlock the door when I push the button.

binary_sensor:

  • platform: gpio
    pin:
    number: D3
    mode: INPUT_PULLUP
    name: “Unlock Door”

I put this code as a binary sensor and whenever I click on the remote the it goes from Off to On. Even though it’s connect to the 5V. If I remove the pins from the relay it turn it from off to on. I have a few questions:

  1. Is there a way to only make it go from off to on if it’s connected to the relay.
  2. The garage door uses a rolling code, which seems pretty safe. Is there anything else I should be worried about?

I’m opened to other recommendations on how I should I connect this since it uses a rolling code system.

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