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DS1307 based Clock using lcd

This project gives you a real time clock with the RTC chip DS1307. This RTC chip has inbuilt oscillator for clock and it has its own registers for full calender. In this project we dont take care about the days and we just use the time functions. There are 3 push buttons on the circuit to change the time and the time is displayed over the LCD display. You have to provide battery backup for the RTC chip, so ...

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Digital Voltmeter using Microcontroller Atmega8

This project gives you a digital voltmeter which can measure voltage from 0v to 25V DC. The values are displayed over the 7segment display. Atmega8 is used and the internal ADC is used to measure the DC voltage. The resistor network is used to reduce the input voltage to the 0-5v.   Photo For more Detail: Digital Voltmeter using microcontroller Atmega8 ...

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4×4 LED Display

The 4×4 LED Display was my first project with a two-layer circuitboard layout. The alignment was not 100% optimal, but sufficent. I wanted to make the board as small as possible, so the parts had to be stacked at some places. The square LED’s were painted black on the sides to keep the pixels sharp. The rows and columns are both controlled by a 4094 Shift&Store-register. The upper four bits control the ...

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microSD ATmega32 Data-Logger

Aim of this project is to present a way to store a large quantity of data into microSD card in files with FAT32 format. Here, ATmega32 is used for data collection and microSD interface. The data is received from in-build 8-channel ADC of ATmega32. One channel is used for reading temperature from LM35 sensor and remaining channels are used for simply reading voltages and storing them. This project can be use ...

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8×8 Bicolor LED Matrix using MAX6964

For a long time I had a layout for this circuit, but could never build it, because the layout was to small to be made by tonertransfer. So it was the first layout I made with my new exposure unit. It’s quite small, so it fits under the LEDMatrix itself. Therefore only SMD parts are used. It took three trys to get it right. The first failed because the etching solution was to weak, took to long and caused he ...

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Thermometer using DS1621 and Nokia 3310 LCD interfaced with ATmega8

I am presenting one application with the Nokia 3310 LCD: Designing a thermometer using DS1621 temperature sensor IC. DS1621 is 8-pin sensor from Maxim, with temp range of -55 to +125 degree C, which can be interfaced with microcontroller over two-wire serial i2c bus. It has operating voltage range from 2.7 to 5.5v. I'm operating it here at 3.3v, same as the one driving the LCD and ATmega8. DS1621 doesn't re ...

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EPROM Display using ULN2308A microcontroller

Due to university and work it has been a while since the last post. But I just completed a little project that’s worth posting. Several old 27C256 EPROMS were lying around unused. So I thought about a purpose for them. As I also had some 8×8 LED matrices, a little animated display came to mind. With each frame consisting of 8×8 pixels the 32kByte EPROM can hold 4096 frames. Each byte holds one line of the d ...

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