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AT89C4051 to work as a Real time clock

Its a digial clock which make use of AT89C4051 to work as a Real time clock. Figure 1 shows the circuit diagram for the digital clock. Port 1 of the controller (AT89C4051) is used as the data lines for the LCD (starting from pin 7- pin14 of LCD). As you can see there is not much change in the hardware except the LCD, here i am using a 20 x 4 lines LCD display. In figure 3 as you can see the digits are bigge ...

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The Tuxgraphics AVR NTP clock using ATmega168

The Network Time Protocol (NTP) has revolutionized the world. Suddenly one could have anywhere in the world accurate time and date. NTP is a simple UDP based protocol and can be implemented in a Microcontroller. Using the tuxgraphics ethernet board and a LCD display we build a nice clock which gets time and date via NTP. Just attach it to you DSL router! _________________ _________________ _________________ ...

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Dot Matrix Arduino Clock using ATMega168

The great adventure that is building clocks continues.  Points of interest in this build is that it was the first chance I got to play with the dot matrix display I picked up over winter break, and it's the first time I've soldered and used a surface mount package (albeit I soldered it to a DIP breakout board so that I could plug it into a breadboard; I know, very meta). This clock displays all of its value ...

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Arduino-based master clock for schools using ATmega128

If your school, or kids school, or other location relies on a central master clock that is broken, you may have a use for this device. New master clocks are available of course, but school budgets are under extreme pressures, and it really is a satisfying project if you have the necessary skills. This master clock controls the signals sent to the slave clocks, and keeps them synchronized. The firmware in th ...

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Real Time Clock/Calendar/Alarm with Interpreter for battery backed-up and battery powered operation with DS interface using ATtiny12

Based on the Atmel ATtiny12L-4PI microcontroller -A real Time Clock/Calendar for less than US$1.50 in moderate quantity.   This is the timekeeping test circuit. It includes a one-transistor circuit to switch in the 5V power supply when present and drop back to the 3v battery the rest of the time. That loop of blue wire-wrapping wire is a lariat used to quickly and easily pull the chip out of the socket ...

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Dutchtronix AVR Oscilloscope Clock using Atmega328 microcontroller

Hardware features:   Connects to your analog scope in X-Y mode using BNC cables or probes (1x, 10x) Uses the Atmel AVR Atmega328p with 32KB flashmemory On board 5V power regulator for use with user provided wall adapter (8-15V DC center positive) Power plug (5.5mm outside diameter) included On-board Real-Time Clock with 32.768kHz crystal and battery backup: this clock won't lose time! Digital to Analog ...

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Morse Code Alarm Clock using ATtiny2313 microcontroller

Morse Code Alarm Clock Modification (Almost) Trivial application of an AT90S2313 or ATtiny2313 in an alarm clock to change the alarm from "BEEP BEEP BEEP BEEP BEEP BEEP BEEP BEEP..." to "WAKE UP" in Morse code. This was designed in response to a request and is in daily use Downloads (Updated 5 December, 2004) AVR Studio Assembly Source: morclk041204A AVR STudio Hex file: morclk041204A.hex Overview The speak ...

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