You can view live sensor data during daylight hours, or you can look at old data from months ago. The data is acquired by a Basic Stamp II microcomputer and reported as a decimal number whenever prompted over a serial port. A server shell script, bsw, prompts the stamp once a minute. A second script, bsr, collects the responses from the stamp and maintains a record of the last one hundred measurements in a file. This is an oscilloscope trace of the dialog.
The stamp measures a trimmer pot on a prototyping board. The trimmer is the blue control with a white screwdriver slot in the center. If you visit this site often, you may notice that I occasionally adjust it.
I can't figure out your device. What the heck is that thing? -- Gary Goldberg
I love it! -- Rick Wartzok
I'm happy to go into engineering details about this project including mathematical models, schematic diagrams, source code, acquistion logs and high resolution data.
I like the new color photo cells. -- Joshua Kerievsky