Thus the output of IC2 connected to clock pin 14 of IC3 has a pulse recurrence period of one minute. During this course, IC1 serves as a divide-by-10 counter and IC2 as a divide-by-6 counter. The output obtained from both of the above-mentioned circuits become more accurate with the fact that both circuits take advantage of 32.768kHz quartz crystal.Įach ICs are designed/wired with a particular task to perform. 1 Hz clock generator circuit is shown in the button of the article. A 1Hz clock is used to supply the input to the IC1 through pin 14. In addition, passive components like few resistors, capacitors, and push-to-on switches are employed. For this purpose, this circuit makes use of six 74LS90 decade counters (in the figure, IC1 through IC6), four 74LS247 BCD to 7-segment decoders/drivers (IC7 through IC10), and four LT S542 common anode displays (DIS1 through DIS4). This section is designed to display the time in hours and minutes format and is wired such that it functions in 24-hour mode. shows the circuit of the 24-hour digital clock section. Preset time storage, comparator, and relay driver circuit.įig.The entire circuit can be divided into two main parts.

Talking about the circuit components, it uses discrete ICs which are commonly available.Ĭircuit Description of 24-hour Digital Clock and Timer Circuit.

After storage of the time as mentioned above, the clock is set to display the real-time (in 24-hour mode) and it serves our purpose.

The time at which the device or load is to be switched ‘on’ or ‘off ‘ can be electronically stored while being displayed simultaneously.

When using this circuit as a timer/an alarm.

This circuit can be used for two purposes: both as a timer and a 24-hour clock.

Arduino Digital Clock using DS3231 Pi Moduleįeatures of 24-Hour Digital Clock and Timer Circuit.Digital Clock with Second and Alarm Time Display.Various Other timer and clock circuits are posted in

24 hour digital clock download