AVR web server with remote equipment control, temperature sensors and temperature graphs

Compiling the software
!! READ THIS FIRST !!
---------------------
! Edit the file main.c and change the 2 lines:
! static uint8_t mymac[6] = {0x54,0x55,0x58,0x10,0x00,0x29};
! static uint8_t myip[4] = {10,0,0,29};

For the first device you build you will not need to change the mymac line.
But you will probably need to change the IP address (myip). It must be a
free address from the address range in your home network.

Use an IP address in the same network as you DSL router.

Example: you wlan router might have 192.168.1.1, your PC might have
192.168.1.2. This means you could e.g use 192.168.1.10 and leave some
room for more PCs. 

Edit the beginning of the make file. And adjust those lines according to the
CPU you use (atmega328p or atmega644):

  MCU=atmega328p
  DUDECPUTYPE=m328p
  or
  MCU=atmega644
  DUDECPUTYPE=m644


Edit the avrdude command definition:
# linux (plug in the avrusb500 and type dmesg to see which device it is):
LOADCMD=avrdude -P /dev/ttyUSB0

# mac (plug in the programmer and use ls /dev/tty.usbserial* to get the name):
LOADCMD=avrdude -P /dev/tty.usbserial-A9006MOb

# windows (check which com-port you get when you plug in the avrusb500):
LOADCMD=avrdude -P COM4

More information about Makefiles can be found at:
http://tuxgraphics.org/electronics/200912/makefiles.shtml

To compile the final software use the command:
make

Note: windows users may use and modify the supplied winmake.bat to setup the
environment correctly.

The above command will compile the following hex file:
main.hex 


Loading the software into the board
The makefile included as well a command to load
the hex file using avrusb500 in combination with avrdude.
You may use your own method to load the file.

make load

The "make load" command will run something like: 
   avrdude -p m328p -c stk500v2 -e -U flash:w:main.hex

Note: your programmer might interfere with the enc28j60! If you use
an avrusb500 then you can normally leave the cable on. For all other 
programmers it is saver to remove the programmer cable and power down/up 
the ethernet board. This is because the SPI interface is used for 
loading of the software and communication to the enc28j60.

To see a list of all possible build targets run the command:
make help

Selecting the right clock source
Tuxgraphics hardware sold as of march 2007 is prepared to use the clock
signal from the enc28j60. To use this you need to change the 
low fuse byte once from 0x62 to 0x60:


avrdude -p m328p -c stk500v2 -u -v -U lfuse:w:0x60:m
or
avrdude -p m644 -c stk500v2 -u -v -U lfuse:w:0x60:m


The above command can as well be executed by using the make
file. In a Linux shell you can just type:
make fuse

Note: windows users may use and modify the supplied winsetfuse.bat script.

For the atmega328p change the lfuse from factory default
to 0x60. The fuse settings of the atmega328p are after programming
should be as below (default factory settings for atmega328p, the
efuse has some not used bits and is dependent on the chip revision):
 lfuse reads as 0x60
 hfuse reads as 0xD9
 efuse reads as 0x07

For the atmega644 the hfuse and efuse bytes look slightly different.
But the idea is the same. Just change the lfuse to 0x60.
Fuses of the atmega644/atmega644a after programming:
 Device signature = 0x1e9609
 lfuse reads as 60
 hfuse reads as 99
 efuse reads as FF

details of the lfuse bits:
  CKDIV8 = 0
  CKOUT  = 1
  SUT1   = 1
  SUT0   = 0
  CKSEL3 = 0
  CKSEL2 = 0
  CKSEL1 = 0
  CKSEL0 = 0


If you are unsure what the current fuse setting are on the atmega
then you can read the fuse settings with a command like:
          avrdude -p m328p -c stk500v2 -v -q

The below list of fuses shows for reference purpose the settings
of a new and never programmed chip. 

The result should be this (default factory settings for atmega328p):
          lfuse reads as 62
          hfuse reads as D9
          efuse reads as 7

The result should be this (default factory settings for atmega644/atmega644a):
          Device signature = 0x1e9609
          lfuse reads as 62
          hfuse reads as 99
          efuse reads as FF

Compilation on non-Unix systems
Please use the provided Makefile !!!

It will also work under Windows.

Take a look at the supplied winmake.bat, winsetfuse.bat and winload.bat file. 
The bat script might be needed to set the environment correctly in order to use
the Makefile under windows.

Edit the Makefile to make the needed adjustments at the top
of the file.

More information about Makefiles can be found at:
http://tuxgraphics.org/electronics/200912/makefiles.shtml

Using the web server
Point your web browser to
http://10.0.0.29   (or what ever IP address you have given your hardware)

You should see a page like this:

------------------------------------------
[refresh] [switch] [graph] 

Temperature

sensor 0: 23.6'C [74'F]
sensor 1: 22.8'C [73'F]
------------------------------------------

The temperature history graphs use javascript. You need a javascript
capable web browser to see them. Even web browsers inside mobile phone
are these days javascript capable.

Authors/Copyright
Most of the software was written by Guido Socher.
The ds18x20 and onewire code is taken from 
http://www.siwawi.arubi.uni-kl.de/avr_projects/tempsensor/index.html
It was written by Martin Thomas and based on code of Peter Dannegger,
Colin O'Flynn and others.

Guido Socher modified the ds18x20 and one-wire code to fit to this
application.

The enc28j60 driver is based on code from Pascal Stang and updated
by Guido Socher.

All code is copyright GPL V2.

Revision history
2009-06-08: version 0.2 -- first public version
2009-06-12: version 0.3 -- - amplify differences in graph height more
                           - correct small depenency error in Makefile
                           - add favicon.ico 
2009-09-20: version 0.4 -- - prevent blocking of eeprom routines
                           - initialize graphdat
                           - security length check after GET
                           - minimum graph width
2009-12-30: version 0.5 -- - improvements to the makefile
2010-03-05: version 0.6 -- - Bug fix: command strings can be more than 20 char
2010-07-20: version 0.7 -- - Update for atmega644
                           - Added download for graph data
2010-08-28: version 0.8 -- - fix bug in javascript code: month off by one
2011-04-26: version 0.9 -- - RSS feed support, to use this you need to 
                             uncomment the line #define RSS_FEATURE
                           - Support for automatic page scaling on smartphones
                           - Possibility to change the sensor labels (names)
                           - No more support for atmega168, due to higher SRAM requirements.