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Best way to create an automatic lobby door opener? Answered

I live on a third floor of an apartment building, and tired of using a key to open the lobby door. I was thinking of using Arduino and something similar to a car alarm remote to make the arduino open the door for 30seconds while I get to it.

What do you guys think is the best way to do this? is my idea even possible?

Thank you very much.

3 Replies

user
iceng (author)2011-07-22

Yes... can tenants buzz people in ?

If in the affirmative, an RFID tag in your pocket would be detected by a uP
which would authenticate and pull the latch on your lobby door, or
better an RF transmitter to your apartment Xbee receiver pushes your
ope button.

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user
Eax5 (author)iceng2011-07-22

Yes you are right bout tenants are able to buzz people in.

I was thinking about RFID, but then I would need to placed the reading device in the lobby, since it will not be able to read from 3rd floor. Or am I wrong?

Can you please explain your second option in a bit more detail please.

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user
iceng (author)Eax52011-07-22

You are correct about the RFID not reaching far enough.

Xbee is an RF transmitter and the 433 MHz RFtransceiver is another of
many devices that can communicate up to a mile with a low cost
uP stamp or arduino sending a coded message to your apartment and
another identical uP that receives and decodes only your message.
Then a relay or semiconductor will be wired in parallel with the open
button in your apartment. 
Just like I can unlock my Subaru from 600' away.

Maybe eBay sells a low cost system for older cars you can hack.

A

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