Electronic circuits based on AVR microcontrollers

Dear friends,

On this site, you will find many circuits based on AVR microcontrollers (μC) from Atmel. I will be adding more circuits, because micro controllers, are used in a lot of applications.

The purpose of my site is to teach all of you that want to learn about electronics, to work with these little powerful things. I believe you will be helped a lot by the source code that I present in my web site.

Today, microcontrollersare very advanced. All microControllers contain FLASH memory, USART, RAM, EEPROM, TWI and many more features, all in one chip at very low cost.

Happy reading,

Vassilis Serasidis

Last update on 21 May 2013

You are visitor number 1644651 since October 2003

128 kHz RFID reader

This RFID reader is based on a small 8 pin micro-controller (ATtiny13) and an Operational Amplifier (LM358). The reading-decoding and outputting data from RFID tag is made by ATtiny13. No special chip is used!

Published: 21 May 2013
Designed by: Vassilis Serasidis (c) 28 Aug 2012

Language: C ( AVRstudio 6 )

4-input mini Logic Analyzer

A mini Logic Analyzer wich has 4 inputs, it's portable (55x65 mm), battery powered and can capture data up to 400kHz.

Designed by: Vassilis Serasidis (c) 02 Jan 2012

Language: C ( AVRstudio4+ WinAVR )

AVR based oscilloscope

A mega32 based low speed oscilloscope. It can be used to measure signals from 10Hz up to 7.7 kHz. The input voltage range can be up to 24V AC or 30V DC.

Designed by: Vassilis Serasidis (c) 01.Dec.2007

Updated on 19 Mar 2011 Voltage and frequency infomation is appeared on LCD.

Language: C ( AVRstudio4 + WinAVR )

PCB exposure box

Tired of spending hours and hours in wire soldering? Do your circuits look ugly and you are looking for a way to produce professional-like PCBs? Then you had better try photoetching. And the first step to do that is to have the right equipment that is an Automated Exposure Box

Published: 25.Nov.2010

Language: C ( AVRstudio4 + WinAVR )

SMS remote control v3.0

This is the the 3rd version of the famous SMS remote control. The older T10s cell phone has been replaced by the GM-47 GSM module by allowing you to find easier this module. Moreover, 8 inputs were added for collecting data from switches (windows, doors, limit switches and more). The SMS is now protected by a password.

Published: 27.Jul.2010

Language: AVR assembly

Generic experimental AVR board v2.0

A simple and small AVR board to develop your applications. It consists of few, cheap and ordinary components like LEDs, Voltage regulator and capacitors.

Language: AVR Assembly

LAN cable tester

Here's a very simple, but practical circuit, which is used to check the type of LAN cables (straight or cross) as well as possible faults. So we use a unit that has 8 outputs, each one of which produces a pulse successively.

Language: AVR Assembly

Infrared remote control receiver

You can control now your media center with this programmable RC5 receiver. Moreover, you can switch On/Off your Media Center by your remote control.

Updated on 12.Aug.2008 *** Sony protocol IR support ***

Language: C ( AVRstudio4 + WinAVR )

USB AVR In-System-Programmer

USB AVR programmer that supports a lot of AVR micro-controllers.

Mike Henning and Vassilis Serasidis (c) 09.Jun.2008

Electronic church bell controller

This circuit can ring the bells with a programmable order, making many melodies. Further, you can write and store your own melody.

2 channel RF remote control

This RF remote control it runs at 418 MHz frequency and support up to 2 channels. It is very safety as the transmitting code is changing every time you push any button (roll-code function)

Updated on 24.07.2005

SMS remote control v2.2

Control up to 8 devices ( On-Off or Reset) by sending a SMS message from any mobile phone, to ericsson T10s, of our circuit.

Updated on: 25.12.2006

USB switch

You can connect one USB device like a printer or scanner on 2 computers and controlled by software.

- Available only in Greek language -

Simple VGA/Video adapter

This project is about creating VGA/Video signals using the 8-bit AVR MCU. The output can drive a TV set or a VGA monitor

Communication of TRW-24G RF modules with AT90S2313 microcontroller

Communicate 2 TRW-24G RF modules (2.4GHz) with AVR micro-controller. This is more an example assembly code and not an integrated electronic circuit.

MIDI generator

Control some MIDI device with ATtiny26. The code can be convert it for any AVR family micro-controller..

Analog inputs for ATtiny26

Study the Analog to Digital capabilities of Atmel ATtiny26. This check circuit uses only 3 inputs. Of course you can may changes to use more inputs.

Acceleration meter for cars

This circuit it is count the acceleration from -1000mg up to +1000mg. Can be used in lot of applications like cars, elevators, ramps and more.

This page is available in Greek and English language

Electronic safety-lock with telecard as key

This safety-lock can be work with up to 8 different telecards (empty or not phonecards) as access keys. Each telecard can be registered or unregistered from the system, by press the corresponding button. Keep in mind that cell phone SIM cards don't work with this reader.

AVR In-System Programmer

In-System Programmer (ISP) This programmer can program lot of AVR micros and its working with AVR Studio 4.

Visual Basic & AVR RS232 interface

Control AVR micro-controllers via Visual Basic software. You can use some development board like MCU 100, STK200, STK500 or build your own board, following the schematic.

AVR composite PAL colour bar generator

After a lot of reading books, articles and discussions with lot of electronic technicians, finally I did it. I make an 6 colour bar generator entire-in-software with AT90s2313-10 over-clocked at 17.734475 MHz !!!

Improved by: Zdenek Zechovsky

Ultra low-cost programmer for AT90Sxxxx family

With this programmer you can program AT90S1200, 2313, 2323, 2343, 4414, 4434, 8515, 8535

LCD 2x16 characters & 4x4 keypad assembly example

Connect AT90S2313 with LCD display 2x16 char and 4x4 keyboard (keypad). Its not any special code (short or fast code) but its very good for beginners

Connect RS232 modem to E-10G

Here is the instructions to build a cable adaptor to connect your pocket PC with any external RS232 modem. The Pocket PC must have serial port.

Programable LCD counter with memory backup

This counter based on AT90S1200A its programmable and when shut it down its keeping the current counts to the memory, until to the power on.

Telecard reader

This telecard reader can read the content of any telecard up to 64 bytes ( 512 bits ) and display it to hyper terminal software by using RS232 port. Keep in mind that cell phone SIM cards don't work with this reader.

128x64 LCD assembly Driver for AT90S2313

Here you will find a source code to drive a graphics LCD display 128x64 pixels with AT90S2313. The connections between LCD and AVR, can be found in to the source code file (*.asm).

RCEN fuse bit programmer

With this stand alone programmer you can enable or disable the internal RC oscillator of AT90S1200 or AT90S1200A.

V 0.3 by Kyriakos Kontakos

V 0.2 by Vassilis Serasidis

V 0.1 by Herbert Dingfelder

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