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DIY projects: AVR microcontroller electronics

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The tuxgraphics ethernet board provides a web server with the possibility to control hardware and read sensors. To access it remotely over the internet you will need a DSL router with port forwarding. Most DSL routers can do that. To know where your system is you will either need a static IP address or a DSL router that can work with dyndns.org. With tuxgraphics.org/cgi-bin/checkip you can see what your current IP is. You can use this during initial testing while you do not yet have a static IP or a dyndns.org (or freedns.afraid.org) account.

If you want an almost ready to use solution which does not require compiling or loading of software then take a look at our offerings for boards pre-loaded with software.

AVR ethernet / web server

The articles in this section use the same tuxgraphics ethernet board for different applications.

2015-01: Programmable 8-character LCD module and digital voltmeter, (PDF)
An 8 character LCD module with some very nice features.
2014-04: Large 4-digit LED display, network connected, (PDF)
A large four digit display that can be programmed in any way.
2012-04: Embedded client, (PDF)
Embedded client systems are really easy to use and they are the best solution if you want measure and monitor something over long periods of time.
2011-08: Pool timer, (PDF)
Pool timer and temperature measurement in one unit conveniently operated from a smartphone or web browser on the PC.
2011-04: Smartphone garage door opener, (PDF)
Use your phone (iPhone, Android phone, any data capable phone) as a garage door opener.
2011-02: 24h Timer with web interface, (PDF)
A universal 24h timer with a nice web based graphical user interface.
2011-02: Ethernet host watchdog 4.x, (PDF)
A small hardware watchdog to supervise your network equipment. This watchdog is as well known as "SNMP voltmeter". It can measure voltages in addition to monitor network equipment with ping.
2010-08: AVR I/O-web server with additional output pins via a 74hc595 port expander, (PDF)
How to have more digital output pins on the IO-web server.
2010-06: Remote flower watering and monitoring, part II (automatic garden watering, (PDF)
An automatic garden watering system that allows you to take care of your garden even when you are away from home.
2010-06: AVR WIFI, (PDF)
A description on how to connect the tuxgraphics ethernet board over WI-FI by using a WI-FI AP-Client.
2010-02: Interfacing a Modbus/TCP system, (PDF)
A web to Modbus/TCP-server gateway.
2010-02: An Ethernet based alarm system, (PDF)
A distributed alarm reporting system that run on any IP network infrastructure
2009-11: Remote home supervision and control, (PDF)
Monitor indoor humidity (SHT11) and temperature as well as outdoor temperature (DS18S20). You can switch a relay remotely to control e.g. the heating in your summer cottage.
2009-08: Remote flower watering and monitoring, (PDF)
An electronic garden watering system that allows you to take care of your flowers and vegetables even when you are far away. Lawn sprinkler control over the internet!
2009-06: Temperature measurement and equipment control over the internet, (PDF)
Display temperature sensor (DS18S20) readings on the web and plot historic data. In addition to displaying temperature data you have the option to switch something on or off over the internet (e.g heating or air conditioning). All this is done with the tiny tuxgraphics avr ethernet board.
Updated recently: 2009-05: Introduction to the tuxgraphics TCP/IP stack, 3rd generation, (PDF)
The tuxgraphics TCP/IP stack is as small and fast as always but has now new functions for web clients, email and twitter.com/identi.ca. We have now a dns resolver library.
2009-04: Using the tuxgraphics embedded web server to control scientific equipment , (PDF)
A more advanced version of the tuxgraphics web-server software controls equipment on the outside of an airplane. You can however also use it if you do not have an airplane ... Very useful of home automation.
2009-04: Using the tuxgraphics embedded web server for Wake on Lan (WOL), (PDF)
How to use the ethernet board to remotely wake up PCs on the LAN.
2009-03: A hobby power over ethernet solution (homebrew PoE), (PDF)
How to use the ethernet cable to supply power to the board.
2009-01: Fast realtime communication over ethernet, (PDF)
How to control IO-pins or read data remotely with less than a millisecond delay.
2008-08: A web based reset button, (PDF)
A small circuit with some software to remotely reset/reboot other equipment.
Updated recently: 2007-09: Temperature and humidity measurements with the AVR web-server, (PDF)
Just add this one SHT11 sensor. No other components are needed to measure temperature + humitidy + dew point.
2007-04: An ethernet weather station, (PDF)
Add a sensor board to the avr-webserver/ethernet board and ready is the web enabled weather station with local LCD display.
2007-02: A LCD display with Ethernet interface, (PDF)
Here is another example on how our general purpose avr Ethernet board can be used. It's also interesting if you don't plan to attach a LCD to you hardware as it shows how to decode http-form data.
2006-12: Using the AVR microcontroller based web server, (PDF)
Examples of what can be done with our avr web server.
The article explains also how to connect it to the public internet.
2006-11: HTTP/TCP with an atmega88 AVR microcontroller (AVR web server), (PDF)
A complete web server in an atmega88!
It's the same hardware as the previous 2006-06 article. Just update the firmware to add a web interface.
2006-06: An AVR microcontroller based Ethernet device, (PDF)
A simple example application to switch on or off a relay via Ethernet from any computer in your network. The hardware is generic and ready for more complicated future applications. Welcome to the fascinating world of small microcontroller Ethernet devices based on the ENC28J60 Ethernet chip. The software described here uses only UDP but click on the article above for a web-interface.

Clocks

2013-02: Tuxgraphics NTP clock with DHCP client, version 2.X, (PDF)
A nice desk top clock that has always correct time and date. This is a new design of our popular NTP-clock.
2007-10: Tuxgraphics AVR NTP Clock, (PDF)
A nice clock that has always correct time and date thanks to the Network Time Protocol. This is and older version of our ntp clock as designed in 2007.
2007-10: An AVR Oscilloscope Clock, (PDF)
Make your oscilloscope show the current time!

Avr programmer

2007-05: AvrUsb500v2 -- an open source AVR Programmer, stk500 V2 compatible, with USB interface, (PDF)
A modern programmer for Atmel AVR microcontroller with USB interface. This one has no "chicken and egg" problem. That is: You can build it without building first a programmer to program the programmer.
This programmer is since summer 2011 available as a USB-Key kit
2009-01: The Tuxgraphics ISP header, (PDF)
A bit of background information about the programmer connector we use.

A bench power supply unit for your lab

2010-05: DDCP: A digital DC power supply unit, (PDF)
A very small an really good DC bench power supply unit for your hobby lab. It has lots of features which you normally find only in very expensive power supplies. This one is affordable, small and easy to build.

Mini avr projects

2009-10: A little glowing Halloween ghost", (PDF)
For Halloween we build a little glowing for flashing ghost
2009-03: Using the "Mini 3 digit display", (PDF)
Different uses of the three digit display. It is not only a DVM module. It can be a counter, a timer, a thermometer, ...
2008-10: An AVR-USB slide show presenter (scroll forward/backward button), (PDF)
A small handheld USB-stick alike device to scroll forward and backward the slides of your presentation.
2007-08: An AVR microcontroller based electronic dice, (PDF)
Simple but really cool: an electronic dice. Works even in outer space ;-)
2007-06: Mini 3 digit display, a small and inexpensive voltmeter module, (PDF)
We build a simple and inexpensive three digit display. It's a voltmeter module but it has also gerneral purpose digital IO pins.
2007-05: A simple digital thermometer, (PDF)
In this article we build not only a thermometer but see also how to interconnect a microcontroller to a linux PC over a physical RS232 interface without the extra MAX232 chip. The I2C protocol is used for the communication.

Software/Hardware development

2012-07: avr-gcc, error: unknown type name 'prog_char', (PDF)
How to get older code to work with the new compiler
2012-05: linux avr microcontroller programming, (PDF)
AVR microcontroller programming in C under Linux
2012-05: windows avr microcontroller programming, (PDF)
AVR microcontroller programming in C under Windows
2009-12: make and Makefiles, (PDF)
How to use and read makefiles
2009-04: Tuxgraphics AVR C-programming tutorial, (PDF)
How to program AVR microcontrollers in C, contains a number of code examples
2009-01: Building your own avr-gcc environment with atmega328p capabilities, (PDF)
How to build a recent version of avr-gcc for Linux (mac, freebsd and windows are also explained).