Pic based wwvb clock

A complete description and specification for the WWVB broadcasts is available (free), document # 432, at The WWVB signal is broadcast as a 60 kHz carrier that is AM modulated with a time code frame that is updated once per minute. Alarm clock timer app The data rate is one bit per second. Windows 7 alarm clock timer Along with time code information, the data frame also contains synchronization bits, calendar data, UT1 correction, leap year, and leap second data. Clock timer switch The clock design presented here only decodes the time data and daylight savings correction data.

Online clock and timer The software could easily be modified to include decoding of the other information bits, if desired. Clock timer javascript The the low frequency WWVB signal strength is weak and reception can be problematic. Online tabata clock workout timer Signal acquisition time is variable, depending on location and atmospheric conditions. Clock timer software Reception is usually best at night between 8pm – 4am. Clock timer download To use the clock, just apply power and wait for reception of the WWVB signal. Travel alarm clock time zones When the clock receives a complete error-free frame of data, it will automatically reset the display to show the correct time. Online countdown clock timer with sound After the initial time correction, the clock will maintain time even if WWVB reception is lost. Clock timer app Hardware Description

As shown in the schematic (pdf format), the heart of the clock is a PIC 16F628 microcontroller running at 4 MHz. Alarm clock projects time on wall Decoded time data is sequentially output from the microcontroller (RA0 – RA3) to the 7-segment decoder/drivers on a 4-bit data bus. Clock timer digital The data is output sequentially as seconds, 10s of seconds, minutes, 10s of minutes, hours, and 10s of hours. Online egg timer clock The microcontroller outputs (RB1, RB2, RB3) route a 10 uSec stroble pulse from RB4 out to each of the 7-segment decoder/drivers at the proper time to latch the data bus values. Clock timer calculator Seconds and 10s of seconds display values are updated once per second. Alarm clock with timer Minutes, 10s of minutes, hours, and 10s of hours are updated once per minute. Online stopwatch digital clock The display consists of 1″ red-orange LED 7-segment displays. Interactive timer clock The decimal points on the displays are used to form colons to separate the seconds, minutes, and hours. Clock timer bomb The 10s of seconds and 10s of minutes displays are mounted upside down to form the upper colon dots. Clock timer with seconds The WWVB receiver is a C-MAX model CMMR-6 and is available from Digi-Key () as part # 561-1014-ND complete with loopstick antenna. Old timer clock toy story Data output from the receiver is sampled by the microcontroller on RB0. Countdown clock timer online Construction

I have built two of these clocks, one using point-to-point wiring and one using a pcb. World clock timer Both versions perform well. Intermatic wg1573 5 timer clock motor Just keep the receiver away from noise sources and the wire / trace lengths short to minimize inductance. Alarm clock projects time on ceiling I found that the receiver is also sensitive to magnetic fields produced by power supplies. Emerson alarm clock time zones I used a 9V, 200 mA “wall-wart” instead of an internal power supply to eliminate this problem.