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Category Archives: MotionDetector
Was reading an article in Make magazine about a guy building his own arduino board. He made a point of saying he didn’t want to use a 7805 voltage regulator but used an L4931 instead because it has low dropout … Continue reading
I managed to print a temporary case for the Raspberry Pi that manages the UDP packets coming from the motion detector (sends emails and provides a web based log). I spent last week trying to print in ABS plastic. It … Continue reading
Don’t grab the 3D printer extruder once it has warmed up. It’s 190C. Water boils at ??? Oh yeah 100C.
The Raspberry Pi that receives UDP packets from the arduino motion detector is now also a web server which allows me to easily view the latest events from my web browser.
Closing another project today. Yay! The arduino sensor detector that monitors the 4 motion detectors in my alley/backyard is now in ‘production’. No more hangs or false positives. When I first brought all the sensors up, I was getting constant … Continue reading
Now that the arduino motionDetector is moving into production, it is time to get busy on the Raspberry Pi that will read the events and notify me of questionable motion. I have had a very rudimentary program running on the … Continue reading
I think I figured out the source of the hang, so I spent a few hours wiring the last two motion detectors into the SensorMonitor. All four are now operational. The hang has not occurred for over a week – … Continue reading
I have tracked the source of the hang problem into the ethernet drivers. The only workable way I’ve found to debug the problem is to turn a LED on as I enter questionable code and turn if off on exit. … Continue reading
Last night I wrote the necessary code to debug the sensor detector hang problem. Essentially I created a timer-based interrupt. Every 500ms a simple watchdog interrupt is called. The watchdog interrupt sees if a variable has been set by the … Continue reading