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Pushbutton circuit

Discussion in 'General Electronics Discussion' started by Aswin200412, Jul 15, 2016.

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  1. Aswin200412


    Jul 15, 2016
    I am using pushbutton inputs for sensing the hand pressure pattern when pressed. Have 20 pushbutton switches in a square type and when we press some of the switches get pressed and others do not. I am looking to transmit this pattern (1s and 0s) wirelessly to a receiver. Which is the best, simple and cost effective way to achieve this?
  2. Amar Dhore

    Amar Dhore

    Dec 2, 2015
    Can you explain a bit more? How are the switches connected to MCU?
  3. BobK


    Jan 5, 2010
    Who said they were connected to an MCU?

  4. Amar Dhore

    Amar Dhore

    Dec 2, 2015
    No one said it. :eek:
  5. hevans1944

    hevans1944 Hop - AC8NS

    Jun 21, 2012
    Here's my two cents: scan the array of switches however you choose that associates a number from 1 to 20 with each actuated switch. Let these numbers represent binary bit positions in three bytes of a four-byte word. The fourth byte is a CRC of the first three bytes. Now, either transmit the 4-byte sequence with an IR or RF transmitter each time a bit changes in the three bytes representing the twenty push-button switches. Or transmit the 4-byte sequence repeatadly at whatever rate makes sense for your application.

    It doesn't matter too much which wireless method you choose, as long as you have sufficient signal+noise to noise ratio to allow reliable reception and decoding of the data stream over the required distance. That is why I suggest including a cyclic redundancy check (CRC) byte in the data stream. You are going to need some sort of microprocessor to implement this project, so might as well add the CRC check-sum to the data stream.
    Last edited: Jul 16, 2016
    Aswin200412 likes this.
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