Clock Timer | Electronic Project Circuits

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PIC16F628 Digital Clock Timer

This clock timer uses a PIC16F628 microcontroller to display 3 and 1/2 digit time and control an external load. It can be programmed to time from 1 to 59 minutes. The clock includes a calendar with leap year and optional daylight savings adjustments. The timer output can be set from 1 to 59 minutes and manually switched on and off. The clock also has a correction feature that allows an additional second to be added every so many hours to compensate for a slightly slow running oscillator. The oscillator uses a common 32.768 KHz watch crystal and the frequency can be adjusted slightly with the 24pF capacitor on the right side of the crystal.

Source:http://ourworld.compuserve.com/homepages/Bill_Bowden/pic_ck.htm
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Be the first to comment - What do you think? Posted by admin - February 1, 2008 at 8:55 am

Categories: Microcontroller, Timer Tags: Clock timer, Microcontroller, pic-microcontroller, PIC16F628, Timer

Real Time Clock PCF8583

The PCF8583 is a clock/calendar circuit based on a 2048-bit static CMOS RAM organized as 256 words by 8 bits. Addresses and data are transferred serially via the two-line bidirectional I2C-bus. The built-in word address register is incremented automatically after each written or read data byte. Address pin A0 is used for programming the hardware address, allowing the connection of two devices to the bus without additional hardware.The built-in 32.768 kHz oscillator circuit and the first 8 bytes of the RAM are used for the clock/calendar and counter functions. The next 8 bytes may be programmed as alarm registers or used as free RAM space. The remaining 240 bytes are free RAM locations.

Read More Source: http://www.avrprojects.net/articles.php?lng=en&pg=308
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Be the first to comment - What do you think? Posted by admin - January 15, 2008 at 9:58 pm

Categories: Microcontroller, Timer Tags: Clock timer, digital clock, time clock

60HZ CLOCK Pulse Generator by IC MM5369

This is digital circuit, Pulse Generator 60HZ and TP 3.579MHZ.
It use IC MM5369 – 8Pin easy use. power supply 12V.
Out put Frequency 60HZ Pulse Generator. (PIN 1)