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A Low Cost Sidereal Clock – [via]
A clock that displays UT(Universal Time) and LST (Local Sidereal Time) is a useful device to have in an astronomical observatory. Using the Arduino open source platform it is possible to build a sidereal clock for less than $200.
A Low Cost Sidereal Clock - [Link]
Frank setup a internet-based temperature logger using the ThingSpeak contest data-logging service:
This project uses a mbed microcontroller (LPC1768 ARM Cortex-M3) to monitor temperature using a DS1620 (digital temperature sensor IC), retrieve the time via NTP (network time protocol), and then log the current temperature to ThingSpeak along with a time-stamp.
See a live graph here.
Internet-based temperature logger with mbed and ThingSpeak – [Link]
TeenyChron project is a clock that pulls time from a NTP server and uses a Garmin GPS module, a TS-7400 single board and two displays to display both UTC and local time. The heart of the system is a single board computer based upon an ARM processor running Linux. This project is well documented and you can find more information on the link below. [via]
TeenyChron: A Linux-based GPS-synched NTP server – [Link]
The Nixie Clock uses the Make Controller’s Ethernet capabilities to go online and check what the time is, via a protocol called NTP (Network Time Protocol). Once it determines the current time, it uses the digital outs on the Make Controller to communicate with a pair of custom circuit boards that drives the nixies and updates the time. [via]
Nixie Clock – [Link]
This is a clock with a big display unit, that has a DCF77 (german timesignal) Receiver and can be connected to an ethernet network, where it can serve as a NTP server. All of this based on an Atmel AVR microcontroller with 8 KB flash.
NTP DCF77 LED Clock - [Link]
There are many time servers around the world that provide reliable time by using NTP (Network Time protocol). Everyone can connect to these serves and receive exact time via this simple protocol. Read more about how does it work in http://www.pool.ntp.org/.
Guido Socher from tuxgraphics.org has built nice simple NTP client that can request for time packets from server and display this data on LCD.
He used one of his AVR ethernet boards where simple server application allows easily configure clock settings like NTP server address, time offset, Clock address and more. The web server has also a second page where current time is displayed – the same as on LCD. Author provides ideas on how to build clock, ad even provides source code, but if you just want to have this clock on your table really fast on then buy a kit from http://shop.tuxgraphics.org/and support Guido for his nice ideas.
AVR Network Time Protocol Clock - [Link]
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