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xTimer V1.0 using AT89C4051 microcontroller

My wife asked me to find another timer for using in the kitchen. She got one already with analog setting, but it needs one AA size battery. Digital setting may not easy for human interface. However I will make it for easy time setting. When I am free I will modify it to be analog setting. May be I can use 555 monostable for POT reading. So I got my lab at home finding old boards and parts on the shelf. I fo ...

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AT89C4051 to work as a Real time Digital 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). here i am using a 16 x 2 lines LCD display. In the first line, I'll display "DAY" and "DATE", in the second line, i am displaying "TIME" with am/pm. Port 3 is used ...

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xTimer with 4094 using ATMEL89C2051 microcontroller

The original version of xTimer used MAX7219 for driving 7-segment. This new design uses a cheap CMOS shift register, 4094 for LED interface. Each 4094 drives a 0.5" 7-segment without the need of limiting resistor. The left-hand LED is timer function with buzzer alarm output. The right-hand is for clock display. Hardware Schematic Fig. 2 shows a complete hardware schematic. U2 is ATMEL 89C2051 running with 2 ...

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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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