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Enigma QR Clock

An arduino and LCD display time in seconds using an optimized QR library by @ch00ftech and an optimized LCD library by @xark

Arduino EnigmaArduino Enigma
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Team (1)

  • Arduino EnigmaArduino Enigma

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  • hackaday article
  • c00ftech site
  • c00ftech QR generation code
  • Enigma QR Clock
  • Xark TFT library ported to Seeed Screens
  • Arduino Enigma Machine Simulator
  • Clear Acrylic Case
Software
ongoing project
QR clock arduino uno seeed adafruit LCD touchscreen

Related lists

Timepieces

Straightforward or Fully Obfuscated; How do you like to tell time?

Arduino Projects

Awesome projects using the popular Arduino platform

This project is submitted for

  • Tell Time Contest

This project was created on 07/24/2016 and last updated 2 years ago.

Description

Inspired by this article:
http://hackaday.com/2012/10/29/qr-clock-is-unreadable-by-humans-and-computers-alike/

A QR generation library was ported to the Arduino UNO and Seeed LCD touchscreen platform. Originally the generation time was 6 seconds, making the display of seconds impossible.

As @ch00ftech suggested, eliminating the search for the optimal QR mask and instead applying a fixed mask, drops the generation time to less than one second.

Using a fast TFT display library by @Xark allows seconds to be displayed. This library was modified to comply with the calling convention for @seeedstudio libraries, making it a drop in replacement in an existing sketch. By changing a compiler directive, this library can also control an @adafruit LCD.

As a further optimization, the last QR code generated is stored in a bitmap so only the pixels that change are painted.

Components

  • 1 × Arduino Uno
  • 1 × Seeed LCD v2.0 or Adafruit LCD
  • 1 × Laser cut case

Project Logs
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  • QR Code background can now be inverted.

    Arduino Enigma • 09/30/2016 at 10:58 • 0 comments

    It was reported that some (citation needed?) apps were unable to decode the default QR background. The i command was introduced to flip the color of the QR code. Updated code is at Github.

    https://github.com/arduinoenigma/EnigmaQRClock

    New Inverted view:

    Original view:

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