inputs devices
dispositius d'entrada

assignment
measure something: add a sensor to a microcontroller board and read it

step response
I adapted the Neil board to make a humidity sensor.
The idea is to make an elongated plate which already had incorporated the two copper plates. The shape allows the sensor buried in the ground and to assess all its moisture. Once welded the plate we have to program the microcontroller. After many attempts (both Mac and WinXP) to use the programmer USBTiny I had to use the commercial version of AVR.

1. Download files for each sensor
http://academy.cba.mit.edu/classes/input_devices/index.html

2. Open the terminal and do the Hex file
make -f hello.load.45.make

3. Program the fuses
make -f hello.load.45.make program-arvusb2

4. Display sensor data captured by the viewer through the Python
python hello.load.45.py

python hello.load.45.py /dev/tty.usbserial- (press TAB to autocomplet de serial port)

5. Python visualitzation should appear.

To open the display, please install the Python via the following link:
http://pypi.python.org/pypi/pyserial

Also recommend the website of Irina Chernyakova. It was very useful for this task: http://fab.cba.mit.edu/classes/MAS.863/people/irina.chernyakova/9_input.html