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Super-cheap drawing tablet - how does it work?

Discussion in 'General Electronics Discussion' started by Doug3004, Mar 9, 2019.

  1. Doug3004


    Sep 5, 2014
    I was browsing a China-direct shopping site and ran across a very inexpensive drawing tablet. It is just for drawing on--it doesn't connect to a PC or anything else. It always draws in a single fixed color against a black background, the drawing color is a dim green. Other sites sell it but the only size is 12" diagonal. Wal-mart has it for $20 but some of the China sellers have it as low as $8. It is electronic somehow (?) and runs off a single large watch-type battery. It has no storage or memory, just a button to erase it. It is very thin, in the pictures it appears about as thick as the stylus pen it comes with.

    How does this thing work? I can't find any info on Google, that all just leads to pages about the PC-connected drawing tablets.

    One example:
  2. Alec_t


    Jul 7, 2015
    So what advantage does it have over a pad of paper?
  3. BobK


    Jan 5, 2010
    Coolness factor.

  4. davenn

    davenn Moderator

    Sep 5, 2009
    of course it is ;)

    didn't you read the description in the link you provided ?

    LCD and touchscreen and a microprocessor to control it
  5. Kiwi


    Jan 28, 2013
    Cool toy for kids to play with to save paper, but no way to save picture.
  6. Doug3004


    Sep 5, 2014
    Yea but a big screen and a logic chip, running off of a single watch cell? The battery looks like a single CR2032.

    In actuality I was looking for cheapo LCD screens for my Arduino-level use. It would be nice if this was a microprocessor-controlled screen that could be re-used, but then it doesn't look like any other LCD/TFT/OLED screen I've seen. And it's way cheaper than it should be, even for a single-color LCD screen that big. So I am wondering if it is not something else entirely, an electrostatic version of the (non-electric) magna-doodle toys maybe?

    In the manufacturer's defense, they do point out that it saves paper when you have a child that just scribbles most of the time....

    I may buy one just to open it and find out. :>|
  7. Doug3004


    Sep 5, 2014
    Just so you know--if I ever get thrown in jail for murder, it's probably because I found the guy who invented those toddlers' books that have the noise buttons along one side....
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