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Need input for new device

Discussion in 'Do It Yourself (Not Computer-Related)' started by MorguhnB, Nov 28, 2018.

  1. MorguhnB

    MorguhnB Thread Starter

    Nov 26, 2018
    I'm trying to make a device, that by touching an object with a code on it (like an ID card with a qr code) it can access the information associated with that ID card.

    Would you recommend a QR code to store text information, and what sensor should I use? *Note: for the purposes of the device I'm making I want the card to make contact with the device / sensor*

    Is this achievable with a qr code, or should I seek out a different meathod?
  2. TechGuy

    TechGuy Administrator

    Feb 12, 1999
    First Name:
    Knowing more about the project might be helpful. QR codes don't require contact with a device in order to be read, so that seems like a bad choice for your requirements. Generally, QR codes and bar codes only store pointer data - an ID number, URL, etc -- that a system can then use to look up. A QR code containing a lot of text is possible, but would need to be quite large to be reliably read.

    If contact is required for some reason, perhaps a swipe-based barcode reader like this one from ID Tech: https://www.barcodesinc.com/idtech/part-wcr3237-700us.htm

    I've used that one on projects before. They have a variant that can be read from a COM Port and another that just enters the contents of the barcode straight onto Windows as though it were a keyboard (into whatever app has focus).

    Depending on the project, it's important to keep in mind that QR and barcodes can easily be duplicated by taking a picture or using a photocopier. You wouldn't want to consider it for a security application. You could also look into RFID cards, like those used for access control doors, but again they don't require contact - only that the card be very close, depending on the reader.
    Last edited: Nov 28, 2018
    Drabdr likes this.
  3. Drabdr

    Drabdr Moderator

    Nov 26, 2007
    First Name:
    Mike, you hit upon what I was thinking about: RFID. There are two kinds: active and passive.

    So... say you wanted to record who comes in and out of a room. The active RFID (on the employee) would emit a signal to the readers on the door.

    If you went with passive, the employee would need to "badge in", or place the passive RFID near a reader.
    TechGuy likes this.
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