Arduino 7 segment Displays Digital Clock With Charlieplexing LEDs

Posted on Feb 6, 2014

This is my second instructable. I just had a mood of making a digital watch. But wanted to make it a learning process. I already had a sanguino i could have easily used that Atmega644 chip. it would have been more than enough. But i wanted to try burning a Arduino bootloader and see if i could make it work. Well i did. I used a Atmega168 for this

Arduino 7 segment Displays Digital Clock With Charlieplexing LEDs

Click here to download the full size of the above Circuit.

project. I used 4 seven segment displays to display time in 24hr format. Here ii experimented with common anode and common cathode. Now i wanted to use other chips too and not just the Arduino which would have been the easier option. The chips i experimented with are 74LS47, 74HC154, 74HC595, 4511 and 74HC139. The final compatible combination was common cathode with 4511 and 74HC139. I used a RTC chip DS1307 to feed the time to the Arduino. I initially wanted to use millis() function in Arduino but it is not that accurate. Using RTC not only saved long coding but also has an added advantage of keeping the time in case the external supply is cutoff. It uses a 3v battery to do this. I have made the circuit in Eagle but sadly I am not thatproficientin using the software (Which is next on my TO LEARN list) so I didn`t make the board. I have attached the schematic i made on Eagle. U can use it to make the board. I used Express PCB to create the PCB. I have also attached this. pcb file here. You can eitherprint this file directly and make a pcb from a copper clad or build a board from Eagle and get it made professionally. 1) In express PCB fileI`veused JMP at some places. It means you have to use wires to short the two pads. This was necessary since i used a single sided PCB. Confirm where to connect wires from the circuit diagram. 2) At digital pin 0 and 1 i have used jumpers. This is VERY IMPORTANTas the LEDS have to...

Visit page

Leave Comment

characters left:

Related Circuits

15w class b audio amplifie0r

The 15 w class B audio amplifier circuit shown here is a simple class B audio amplifier based on TL082 op amp, TIP41 and TIP42 transistors. LM833 is a dual amplifier with high scanning speed and...

2 watt amplifier schematic diagram

The circuit is intentionally designed using old type transistor, it is to get the harmonic distortion and to avoid the difficulty of finding good components. Amplifier (s) can be easily supplied by...

22Watt x 2 audio amplifier

22Watt x 2 audio amplifier circuit diagram. This circuit uses IC TDA 1558 from Philips. TDA1558 is a monolithic integrated class-B Output power amplifier in 17-lead single-in-line (SIL) plastic...

20 Watt Power Amplifier

20 Watt Car Power Amplifier circuit diagram bases TDA 2005. This TDA 2005 IC was designed specifically in car audio system for power boosting applications. This IC has a protection against short...

22 Watt Stereo Amplifier

22 Watt Stereo Amplifier circuit diagram. This circuit can be used for audio home amplifier and car audio amplifiers. It is extremely simple design, inexpensive and very easy to build. Even a...

Power Amplifier Class D Circuit

240W Power Amplifier class D circuit based TDA8924. The chip has a short-circuit proof output, thermal protection and acoustic protection from the inrush current when you turn on and off. The...

30w power amp tda2040 schematic

It is small and compact stereo amplifier is powerful but can easily be used to replace your broken amplifier or new construction, or to make an active speaker, in all cases combined with a...

40W audio amplifier based on TDA1514 circuit diagram

Here is a circuit diagram of car stereo. Below is a circuit diagram of class B 15 Watts audio amplifier is designed using a dual op-amp and transistor. The 15 W class B audio amplifier circuit...

New Circuits

Zero consumption Anti-theft High power Code Switch for E-Bike Batteries

This project fits more for custom made battery casing that can have more space to hide things inside. This switch with few alterations can be used for any other project as well but is designed based on e-bike needs! This project use a clever functionality of....
Ultrasonic distance finder circuit

The circuit described here uses ultrasonic oscillations and operates based on the propagation velocity of these oscillations in the air. Thus, we can easily determine the distance of two points if the time within which the wave travels this distance is....
Simple Metal detector circuit with CD4030

Sometimes the precious metals are hidden too deep and are not detected except with complicated devices. In many cases, however, small pieces of precious metal buried near the surface can be detected by relatively simple means. Everyone is very attractive to....
Fully automatic watering circuit for flower pots

Many times for various reasons we forget or can not water the plants that we have in our homes. And many humidity sensors units just notify us with a beeping sound or with a flashing light, that the pot needs watering. But what if we are away from home? This....
Simple deep searching metal detector circuit

The principle behind a metal detector is really very simple. Proof of this is the circuit that follows, in which it proves that the construction of a metal detector can be done in the minute, with few components that we find very easily everywhere. With the....
Sub-Harmonic Bass Converter for Electric Guitars

The sub-harmonic bass generator is a sound producing unit for guitars. The sound it produces looks very much like that of the bass guitar. The octave generator is sometimes quite unusual since it does not produce any of the usual ways of coloring the sound,....
Echo Depth Sounding Sonar for Boats

In the past the sounding (sea bottom measurement) was done with the "bullet", that is, with a heavy lead object that the seamen plucked into the sea hung from a calibrated rope. As soon as the "bullet" reached the bottom, the depth appeared directly from the....
100W HiFi Audio Amplifier Circuit

This Amplifier was designed to have the following specifications: Distortion less than 0.1% at full power of 100W even at 20KHz. Power has to be attributed to an extended bandwidth. The output transistors must be protected against short circuits. The power....
Plant-Pot Water Level Indicator Circuit

A series of LEDs serve to alert the gardener when plants need water. Using two conventional digital integrated LEDs and a series of LEDs, we make a very useful device for gardening. The device detects the amount of water in the pot and alerts the grower.....