Retro 7 segment digital clock

A friend of mine presented me with a mechanical digital clock from the 70's. The display mechanism had broke and attempts to fix it failed. It was decided that it would be easier to remove the mechanism and use a 7 segment display. Fortunately, there were 7 segment digits available that fitted perfectly in the clock's display the window!

This project features an RTC which accurately keeps time even if the clock is ever switched off ! There 2 buttons for navigating menu and changing clock values, and the current temperature can be displayed by pressing the second button when the clock is running. The clock automatically adjusts for BST by automatically adding or subtracting an hour early in the morning. The device is powered by 5v on USB..

Details

Features

Multiplexed 7 segment display
Accurate time keeping with RTC and battery backup (keeps time when powered off)
Menu and change value/show temperature buttons
Temperature displayed to 1 decimal point
Automatic adjustment for British Summer Time (BST)
Powered via 5v USB
Scrolling messages

Building

The circuit is simple to build but connecting all the 7 segment LEDs get tricky.
Follow the attached schematics or breadboard view
I CNCed a circuit board so that the 7 segment digits would fit the window in the clock exactly. These files are attached.

Coding

The source code is attached. I used Sublime Text for editing and Arduino IDE 1.6.5 for uploading

Files

LittleClock.ino The main program ino - 15.61 kB - 06/05/2018 at 20:07		Download
Display Schematic.png Display board schematic for 7 segment display @ 600 DPI Portable Network Graphics (PNG) - 52.42 kB - 05/30/2018 at 10:23	Preview	Download

Display Board.png Display board for 7 segment display @ 600 DPI Portable Network Graphics (PNG) - 77.51 kB - 05/30/2018 at 10:22	Preview	Download

Schematic.png Circuit schematic Portable Network Graphics (PNG) - 178.54 kB - 05/30/2018 at 09:52	Preview	Download

Breadboard.png Circuit on a breadboard Portable Network Graphics (PNG) - 461.53 kB - 05/30/2018 at 09:51	Preview	Download

Components

4 × 7 segement digit display common cathode
1 × Arduino Pro Mini 5v
1 × DS3231 RTC
2 × Push button
8 × 150 Ohm resistors 1/4W

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Retro 7 segment digital clock

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