Showing posts with label clock. Show all posts
Showing posts with label clock. Show all posts
Sunday, September 21, 2014
Alarm Equipped Digital Clock LM5860 circuit and explanation
Alarm Equipped Digital Clock LM5860 circuit and explanation
LM8560 digital clock circuit has many features like:
- Single chip P-channel ED MOS LSI.
- LED direct drive using time division (duplex configuration).
- Wide operating power supply voltage range.
- Built-in alarm function with 24-hour control.
- Supports changeover between 12-hour AM/PM and 24-hour displays
- Built-in battery backup CR oscillator.
- Built-in automatic fast forward function for hour and minute settings.
- Built-in sleep timer function (maximum intervals of 59 minutes or 1 hours and 59 minutes).
- Built-in snooze function supporting repeat use.
- Equipped with power failure display function.
- 900Hz output for alarm tone .
Using LM8560 circuit you will have many advantages , because of integration in one package of all features you can use it in small clock alarm radio circuits or in a simple clock alarm circuit. For LM 8560 clock alarm circuit you can use a positive or negative power supply maximum 15 volts.
Saturday, August 9, 2014
Real Time Clock Using the PIC16CXXX
A very simple real time clock electronic project can be designed using the PIC16CXXX microcontroller family , designed by Microchip Technology . This real time clock electronic project uses the Timer1 module, from a mid-range PIC16CXXX microcontroller, to control a low-power real-time clock. Timer1 was chosen because it has its own crystal which allows the module to operate during sleep.
Upon power-up, the device is initialized with the display starting at 12:00 PM, and Timer1 is configured to generate an interrupt (every second). The Timer1 overflow interrupt wakes the device from sleep. This causes the time registers (HRS, MIN, SECS) to be updated. If the SECS register contains an even value (SECS<0> = 0), the colon (":") is not displayed. This gives a visual indication for each second. Then the device returns to sleep.
Real Time Clock Circuit Diagram
Upon power-up, the device is initialized with the display starting at 12:00 PM, and Timer1 is configured to generate an interrupt (every second). The Timer1 overflow interrupt wakes the device from sleep. This causes the time registers (HRS, MIN, SECS) to be updated. If the SECS register contains an even value (SECS<0> = 0), the colon (":") is not displayed. This gives a visual indication for each second. Then the device returns to sleep.
Real Time Clock Circuit Diagram
For setting the clock are used three keys : SELECT_UNITS Key (S1) selects which units are to be modified (hours, minutes, off), the INC Key (S2) increments the selected units and CLR_MIN Key (S3) clears the minutes and seconds (useful for exactly setting the time ) .
This simplify design use a standard Hitachi LCD display module and some other electronic parts .
The RA2:RA0 pins are the control signals to the LCD display, RB3:RB0 acts as a 4-bit data bus, and RB7:RB5 are the input switches. The OSC1 pin is connected to an RC network, which generates an approximate 4 MHz device frequency. Because Timer1 operates asynchronously to the device, the devices oscillator can be configured for RC mode.
Timer1’s crystal is connected to the T1OSI and T1OSO pins. A good choice for a crystal is a 32.786 kHz (watch) crystal.
This electronic project and source code was designed by Mark Palmer Microchip Technology Inc.
Download Source code
Subscribe to:
Posts (Atom)