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Thread: RFID-Based Auto-lock/unlock System

  1. #31
    Maximum Bitrate Mickz's Avatar
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    Well I have the option of Auto Locking, but when exiting the Vehicle the RFID unit would stay powered on for a few minutes, so just present the tag, The Micro looks at the door state, if locked it unlocks, if unlocked it locks.
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  2. #32
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    and if you driving with locked doors and place you hand on the door rest? )))
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  3. #33
    Maximum Bitrate Mickz's Avatar
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    No, it won't unlock as the reader aerial is in the door handle - no way it can read the tag in side the car, the arm rest is also shielded from the door handle by the metal door.
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  4. #34
    Maximum Bitrate tempgp's Avatar
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    then i guess it will work
    for my car i probably will wait for iPhone with NRF
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  5. #35
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    I realize that this thread is for RFID based systems and there are many different options available including commercial units. However, the real question is why carry something extra when the device that you are already carrying in your pocket (your cell phone) is more than capable of performing the task when used with the right hardware. Our system is Bluetooth based, but accomplishes the same goal as RFID without some of the drawbacks. Full disclosure: I'm very biased towards Bluetooth based Passive Keyless Entry since our units are some of the only ones available in the market (you can look under my profile for additional info).

    -Mark

  6. #36
    Maximum Bitrate Mickz's Avatar
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    Well, I for one don't carry a cell Phone. I have a dedicated Phone module built into the Vehicle.

    There are Wireless Unlock and Lock modules built for a Vehicle that operate when you are a few feet away from the vehicle. Walk close to the vehicle and it unlocks, walk away and it locks. Simple device - almost no drain on the Vehicle and tiny TX module (attach to key ring) has a battery life of over 12 months.

    But if you want to go Bluetooth phone then why not, there are also RX modules designed to auto logon to a PC by sensing an authenticated Bluetooth enabled phone to do so.
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  7. #37
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    Quote Originally Posted by Mickz View Post
    There are Wireless Unlock and Lock modules built for a Vehicle that operate when you are a few feet away from the vehicle. Walk close to the vehicle and it unlocks, walk away and it locks. Simple device - almost no drain on the Vehicle and tiny TX module (attach to key ring) has a battery life of over 12 months.
    Any links to such a product would be highly appreciated.

  8. #38
    Maximum Bitrate Mickz's Avatar
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    Local units would be the Viper PKE system or Directed PKE 2102T Passive Keyless Entry. Most of the smaller and lower cost devices I see are from China.

    There is just so much development gear available from there but because of the volume and description it's very hard to find quickly. I've purchased a few unique development devices from China and have been happy with them all.
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  9. #39
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    Hey Mickz, since I will be developing my own alarm system for my truck and I am interested in any of those developer boards you are talking about.

    I will likely make use of a standard car start unit and drive that from an ARM based board or Microprocessor such as a Parallax Prop. But having something like this would be great. I will likely start with the sensors from a quality alarm since those are well tested and use them with the system I create.

  10. #40
    Maximum Bitrate Mickz's Avatar
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    Yes great way to go. The hardest part of a DIY longer range RFID access system is in making the pocket or key ring transmitter really small. There are a few tiny units starting to appear for just a few dollars, only need a tiny SMD 8 pin micro and a bit of code to make a good package, that will be my next project when I find a really small TX module. Using low duty cycle TX you can get battery life measured in years.
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