This is an Arduino powered 24-hour digital clock that uses the RTC chip DS1307 for timekeeping. DS1307 has a small battery backup so that it keeps the correct time even the rest of the circuit is not powered. The time is displayed on 5×7 LED dot matrix. [via]
Arduino: 24 hours digital clock – [Link]
So I ordered a 1-Wire RTC (real time clock) from the maxim corporation. To be exact its a ds1904. What is really cool about the 1-Wire protocol is it only needs 1 wire to send data on. It is a bit misleading however since it does need a ground as well.
1Wire Real Time Clock With Arduino - [Link]
This is a timed digital switch. It uses a 16F84A PIC microcontroller to control the relay and it’s timming.
Timed digital switch – [Link]
A circuit made for displaying the time using 7 segment display (for decimal display) and LEDs (for binary display). I used an Atmega16 microcontroller and shift registers in the schematic. For more details contact me.
Binary and Decimal Clock - [Link]
Oscar Gonzalez from BricoGeek has build a nice clock using 7 segment displays and LED matrix. The clock uses and Arduino MEGA with a Real time clock module and an SHT15 board from SFE. Six digits 10 cm tall shows the current hour and date. 4 LED display matrix are used to show temperature, humidity and an RSS feed from the Internet. [via]
A cool clock made of marble – [Link]
Randy Sarafan writes: [via]
I decided to make a quality DIY intervalometer for my DSLR Pentax camera. This intervalometer should work with most major brands of DSLR cameras such as Nikons and Canons. It works by triggering the shutter using the camera’s remote trigger port. It can also auto-focus before each shot if so desired (or toggle this on or off at any time). The brains of this intervalometer is an Arduino chip. It may seem very complicated at first glance, but is actually a simple circuit and not that hard to make.
Pentax intervalometer - [Link]
This project is a frequency standard based on GPS signal that has the advantage of great stability.
Using the GPS Satellite system offers the advantage of very accurate timing and by extension, frequency control. The long term error is to all intents and purposes zero, with time and frequency accuracy being comparable to the international standard. The traditional route is to use a relatively low cost GPS receiver module which outputs a 1 Pulse per second signal (1 PPS) aligned to UTC.
GPS Disciplined Frequency Standard - [Link]
This project shows how to modify an old hard drive to make a LED clock based on PIC16F628 microcontroller to control clock operation. The clock is using 12 high power LEDs to display the clock hands. There is also a slot cut into upper drive platter and white tape on center drive platter provides a slot that when illuminated by the LEDs will represent a clock hand. Three micro switches set hours, minutes and seconds.
Hard Drive Clock - [Link]
This project shows how to convert a TI Graphing calculator into an intervalometer to take time lapse photographs with your SLR camera. You hook the calculator to any camera with a remote shutter release socket. It’s quite easy, and depending on your camera can require no electronic work at all. Take a look on time lapse photography results.
Turn a TI Graphing Calculator into an Intervalometer – [Link]