Hacked Gadgets Forum

April 7, 2007

AVR Ethernet Weather Station

at 5:41 am. Filed under Complex Hacks, DIY Hacks, Electronic Hacks

Guido Socher
build this Ethernet Weather Station project that uses an AVR microcontroller to process data from weather sensors. Software and schematics are provided.

“Using an add-on card to the already existing avr ethernet board we build a weather station. That is a weather station with a build-in webserver.

My original plan was to have sensors for temperature, air pressure and wind. I started a prototype and it worked very well except for the wind measurement part. I have written a separate article about it: wind-vane-ver01.shtml. I plan to improve the wind measurement hardware and add it at a later point in time.

For now the weather station has 2 temperature sensors and an air pressure sensor. It works reliable and precise even after several month of testing.

For the sensors we will use:

* For temperature measurements: LM335. This sensor is cheap and has a linear curve over a wide temperature range. This will give us very accurate temperature readings over a wide range. The accuracy will be almost constant over the whole range.

* A Motorola/Freescale MPX4115A absolute air pressure sensor. This sensor is already calibrated at production time. The MPX4115A is not made for out-door use but that is not a problem. The circuit can be in a save and dry location inside the house as the air pressure is exactly the same inside and outside the house.”