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What is the name of the sensor I need to solve this problem...

mutazoid

I need to put an item on a pad.

The user will put a card on the pad.

 

The card should have 2 sensors on it and the pad should be able to output a byte of data based on which sensor is touching the pad.

 

What kind of sensor should I be researching?

What is the name of the sensor pad?

 

Thanks for any help....  Im not very knowledgeable about electronics but Im working on a design of fun little product.

 

Keith

  • You may be looking for a force gauge, this measures the force that is place upon it and outputs a voltage. Look at phidgets.com to find easy ways to prototype this (they sell interface systems and force gagues). You can tell the difference between items with the gauge. Another thing you might want to look at is RFID tags, (you can find these at sparkfun.com with serial interfaces) you can put the tags on your card or other item and it will be able to give the ID of the item.

  • in reply to Former Member

    No I dont want to measure force, I need something like a bus card but double sided.

    So, when the user touches the card to the pad I can read which side the user touched the pad with.

  • There are several ways to solve this problem.

    You could use light. The cheapest way is to make holes in the card and put several light sensors, like LDR resistors, on the pad.

    When a card is placed on the pad, the detectors covered by the card are dark and the sensors opposite to the holes remain illuminated.

    The position of the holes must be different when the card is placed upside down.

    Instead of holes it is possible to reflect light by the card, using black and white areas on the card. Then you need light sources and tetectors in the pad.

    The ultimate way for this principle is to print barcode on the card and use a scanning barcode reader.

    You can also use a video camera looking at the card. You could use video recognition software. A simple way is to print a line pattern on the card that will produce a specific frequency or data message within the video-signal.

     

    An other way is to use capacitive contact between a metallic pattern on the card and the pad. The card can create a conducting path from a RF generator at ons side of the pad to a detector at the other side. With the card upside down the signal will be guided to the other detector or the detector will receive a signal from another generator in the pad.

     

    RFID tags cannot be used. As far as I know RFID tags respond the same when the card is put upside down.

  • in reply to jvdberg@ieee.org

    Ok I cant put holes in the cards so light is out of the question.  Barcode is impossible because the items will have a small surface area to add the sensor.  Capacitive sensors could solve my problem.

    The surface area will be about 1cm in length. 

    So, is it possible to 1 sensor on each side of a card and have about 50 different sensors.  Each that would be read in sensor pad plugged into a computer.  Then the computer determine what sensor is touching the sensor pad?

     

    (So much thanks for your help so far)

  • Has anyone seen tabletop video games that also incorporate playing cards  in Japan?  I think this is the technology Im looking for...  I just  dont know what the technology is called....

  • Hello Keith,

     

    WiFi SST300 sensor ,  Could show sigal on pad.  We are professional on inclinometer sensor .

     

    Sunny

     

    www.vigordigital.com