Digital Clock Based on the PIC16F84A

Ok, it isn’t a new and extraordinary task to build yourself own digital clock. However, you’ll get different feeling and experience, even you’re repeating the same projects for over hundred or thousand times! Let’s take an example. You’ve probably built several digital clock in the past, and you must think it’s silly to create another digital clock here. Well, let me remain you that this digital clock is slightly different from the others. As you can see on the above picture, this digital clock has a bigger and brighter LED display. The main purpose of this project is to build a clock that can display the time and date on ten seven segment displays. In addition, you have to make sure that the project can easily fit in a small red see-through box as shown on the above figure. Continue reading

Digital Clock That Based on PIC16F84A

The clock is regarding one of the oldest human inventions, where it’s meeting the need to measure the time in the natural units, such as second, minute, day, month and the year. However, if you want to measure the time accurately, you’ll need the help of some devices. For your information, the sundials has been identified the earliest time measurement in human history. The ancestors used the sundial to measure the time of day by the direction of shadows cast by the sun. Due to its reasonably accuracy, the sundials continued to be used to monitor the performance of clocks until the modern days. Brother Paul has invented the first record of a minute hand on a clock in 1475. Alexander Bain, a Scottish clockmaker was the first inventor that patented the electric clock in 1840! Although the digital clock is one of the most common items in nowadays, but you cannot miss this digital clock. It is a small adjustable clock, where is based on PIC16F84A microchip. The hardware part for this project is quite simple, as it only… Continue reading

The Fabulous LED Flasher!

If you think that the Light-emitting-diode (LED) is nothing more than an ordinary semiconductor diode that emits light when an electric current is applied in the forward direction of the device, then you must change your thoughts here… Do you know that LED is being classified as one of the most incredible inventions for the electronics components? Furthermore, LEDs are widely being used as indicator lights on electronic devices and increasingly in higher power application, such as flashlights and area lighting. Talking about the flashlights, would you want to build an awesome LED Flasher? Well, this LED flasher is somehow unique than other flasher, as it has five different blink patterns, and it’s the right choice for those that want to decorate their house during the Christmas season… For your information, you’ll need the PIC16F84A and eight high brightness LEDs for this project. Some other electronic components, such as 78L05 regulator, IC socket, Resonator, Switches, Resistors, Capacitors, Wiring terminals, Studs and Printed boards will be needed for this LED flasher project as well! The circuit will control the blink of… Continue reading

The Homebrew LED 7 Segment Countdown Timer

Anyone here that ever been to any Countdown party, such as the New Year countdown party at Times Square? Yep, if you did then you’ve very familiar with the gigantic energy-efficient LED countdown ball at the Times Square. If you thought that it’s a tough work to develop the countdown timer by your own, then you should think it again. Today, you’ll have the opportunity to build a seven Segment LED Countdown timer and this project is easier than any others are. Here is a countdown timer that based on the versatile PIC16F84A with so many practical applications. The time range can be adjusted between 1 second to 999 seconds, but for taking an example, the timer is being set to the 3.00 minutes count down and it’s ready to be started anytime you want. The PIC16F84A is running on 4.00MHz using crystal or resonator, it won’t cause any critical to the circuit since it only runs for a few minutes. When time is over, the sound output will be situated in “active HI” condition for 1 second. The active… Continue reading

Precise LC Meter on PIC16F84A microcontroller

Almost every multimeter has ability to capacitance measurement ability, but inductance measurement is included in more advanced or specialized multimeters. Especially if you like to work with RF technologies, power supplies, LC measurement capability is vital. Instead of buying one I suggest to build one and have pleasure to use accurate LCD metter built by yourself. Design is very simple so it is easy to replicate. It can measure inductances from incredibly small inductance 10nH up to 100mH and capacitance from 0.1pF up to 900nF with auto-ranging capability. Information is displayed on 1×16 LCD module. Zero out button allows to set initial inductance/capacitance for precise measurement. Project page has detailed description on developing LC meter and putting in to nice box. All you have to do is to assemble circuit and flash the program. If you have some troubles in building it, you may buy kit with preprogrammed PIC microcontroller. Continue reading