These posts just keep on piling up! We had our third class today, during which we started of with our first test of the course, I must admit there were no surprises, very fair and content based. I both hope and feel that I got a pretty good mark so I will be anxious to see how I did. After the test we continued on with our activities from the course website. Last day we left off with non-contact sensing devices, so today we picked up in the same topic but with a photo transistor, and an infared diode which we hooked up together so that the infared diode could be used in order to activate the photo transistor. A neat fact about the infared light emitted from the diode was that it could not be detected by the naked eye but could be seen if you looked at the diode through a cell phone camera, after trying this I agree! A second interesting point was the everyday application of this technology in garage doors, this is often used to act as a safety feature so that people are not caught under the door.The rest of the activities were done with a passive infared sensor, and a hall effect switch. the infared sensor simply detected motion, while the hall effect switch was activated by the presence of a magnet. The interface had a red and green light display rather than a schematic of a switch being open and closed.
Until next time....
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