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11 Apr 2014


Marcus Linderoth built a clock using a TI MSP430g2553 microcontroller and a HPDL-1414 display, that is available at Github:

After having ported Contiki to the Launchpad, I was eager on doing something with it. I built this simple clock with a vintage HPDL-1414 “smart four-character 16-segment alphanumeric” display and a msp430g2553.


Clock with retro display - [Link]

3 Apr 2014


frankenroc @ instructables.com writes:

You don’t have to be in Times Square to enjoy large bright displays of lights. You can create that in the comfort of your own home with some foam board, LEDs, and our little friend Arduino.

My sister-in-law decided to get married on New Year Eve, and the venue she chose stays open until 1am that night, so I started thinking it would be great to have a nice big countdown clock. I ran the idea past her and her fiance and they both loved it, so I went to work.

When I made it I intended it for just one use, but it’s a very impressive display that can be seen across a huge room. This is pretty simplified and what I’m showing you is on a breadboard. Optimizing and taking it beyond prototyping (e.g. replacing the breadboard with some pcb boards) are outside of the scope for this but shouldn’t be too difficult.

Giant Two-Digit Countdown Clock - [Link]

19 Mar 2014


Electro-Labs informed us about his latest project:

One of the most enjoyable part of being an electronics person is creating your own gadgets and using them in daily life. In this article, we are building one of those with the help of SoloPCB design tools, a digital desk clock with temperature display feature.

The brain of the circuit is a Microchip PIC18F252 microcontroller. It acquires precise time information from DS1307 real time clock via I2C interface and displays it on four digit 38 mm seven-segment display with the help of MAX7219CNG display driver. The temperature data is read by the on-chip ADC module of the microcontroller from LM335 temperature sensor which outputs 10mV per kelvin degree linearly. The temperature data is also displayed periodically.

DIY Digital Desk Clock with Temperature Display – Part 1 - [Link]

7 Mar 2014


Andrea Biffi build a nice vertical nixie clock using ATmega8 mcu. He writes:

After the success of my first nixie clock made out from a rosewood block, I decided to lose no time and to carry on with the next one.  As some of you guys already know, or imagine, lately I’m indeed a little bit addicted to nixie-mania. I’ve bought many nixie tubes on eBay, and I experienced in electronics so to build my own high voltage power supply and then the ultimate nixie clock circuit. Digits for this clock are nice rounded and fully transparent IN-4 tubes, the same I used in the first model, but as I previously announced, I aligned them vertically, so to read from top to bottom hours, minutes, and seconds. Indeed you will see the undeniable influence of Max Pierson’s vertical clock. I guide you now through the full process to make your own unique nixie clock.

Vintage style nixie wall clock - [Link]

25 Feb 2014

svkatz80 @ fritzing.org build a nice LED clock. He writes:

This clock is based on ATmega328p microcontroller, with combination of DS1307 – Real Time Clock, MAX7219 – 64 LEDs drivers, 74HC595 – shift registers, DS18B20 – temperature sensor, GL5528 – photoresistor, LEDs and other electronic components.

  • Clock with RGB seconds — Four 74HC595 control 10 RGB leds. But TLC5940 is a better choice.
  • Ellipse clock — Three MAX7219 control all LEDs. No shift registers needed.

Each MAX7219 can control 64 LEDs. For ellipse clock I used tree of them. The first one controls 2 hour’s digits (2x7x4=56 green leds + 6 blue leds + 2 dots between hours and minutes ). The second one controls 2 minute’s digits (2x7x4=56 green leds + 6 blue leds). The third MAX7219 controls second’s 60 red leds .

For making a 7 segment digits, I used 5×7 cm prototype PCB circuit board. Before solder the LEDs, I wired the board for 4 digits and 7 segments each of four boards with copper wire. See circuit.

As a main board I used a coroplast (polygal) sheet. Just print the sketch and make on polygal holes with a needle for LEDs.

ATmega328p based LED wall clock - [Link]

13 Feb 2014


Kevin Rye writes about his Mini 7-Segment clock V2 project:

Now for the moment of truth. I crossed my fingers and connected a battery pack. Woo hoo! It works! I love that feeling you get when you spend weeks working on a project, it all comes together in the end and it just works. With the electronics working, it was time to put it in the enclosure. I cut the end off a SparkFun 5V DC power supply and soldered on a 2-pin Dupont connector. I then secured everything with a little heat shrink tubing. I then took the acrylic panels that I designed and had laser-cut from Ponoko and secured them to the clock via some screws and standoffs.
It looks amazing! I’m really happy with the way that it came out. I also really like the “kelly” green segments on this display.


Mini 7-Segment clock V2 - [Link]

11 Feb 2014


pinomelean @ instructables.com writes:

Numitrons are neat display devices similar to nixie tubes but designed for much lower voltages. Numitrons are basically incandescent displays in which filaments create the segments.

They have a steampunk look that i liked so much. I bought 6x IV-9 russian numitrons in ebay, they were about 3$ each, they’re pretty cheap!
At that time i didn’t know what to do with them, but then i thought about a clock. Using software from a single LED display clock i made this impressive numitron clock.

Single digit numitron clock - [Link]

19 Jan 2014


Greeeg at the 430h forum has been working on a RGB LED ring clock:

The clock is comprised of 2 rings of 60 LEDs each. the LEDs are WS2812 parts, which include a built-in driver. The PCB is one of the interesting parts of this clock. I designed the board in altium as a single 6 LED segment. and then left pads at each end to allow them to be soldered onto another segment. Currently I am using a MSP-EXP430FR5739 board to drive it, using some very in-efficient assembly code that requires a 20MHz clock.


RGB LED ring clock - [Link]

21 Nov 2013


BO.Duino is an Arduino compatible board based on ATmega328 ATMEL’s mcu. This board features many peripherals usually externally connected on a breadboard or prototyping board such as sensors, SD card etc. Peripherals included are:

- A real-time clock
- AT24 series external memory chip
- MicroSD card adaptor (SPI)
- A potentiometer on analog input
- Connector for DS18b20 or DHt11 series sensors

BO.Duino – ATmega328 Arduino Compatible board - [Link]

14 Nov 2013


This is a 7 segment clock displaying HH:MM:SS using PIC16F84A and 4017 digital IC. Complete source files are included.

PIC16F84A Digital Clock - [Link]





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