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I'd stay clear of the PIR and go the ultrasonic route.HarveyH42 said:Also have a servo driven pan mount idea using two PIR sensors to lock onto people and keep them in the frame, sort of motion tracking. Basically, it will pan back and forth until a sensor detects, the pan that direction and stay until the sensor is clear, or the other sensor picts up something. If bothe sensors are active, the camera points in the middle. Have some issues to look into, the PIR isn't good in bright sunlight, or reflections. For my area, think it would be more of a night time function. What effect will an IR illuminator on the detectors? Also about a 5 second delay between detection and reset. Have to build it and see what good it will do.
picbits said:Heres a couple of ideas ......
Use resistors inline with the PIR sensor contact and another resistor in the alarm panel - make a potential divider with a regulated voltage as the feed and then use the PIC A2D converter to monitor the voltage - a very effective anti-tamper circuit.
Look at the Dallas iButtons - easily readable by a PIC and incredibly secure. Good for door entry systems, alarm arm/disarm etc
PIC based temperature monitoring device - could be useful as a fire detector
Keypad entry system ?
That should keep you going for a couple of hours
picbits said:I'd stay clear of the PIR and go the ultrasonic route.
Basically have a 32 entry table on a PIC which holds a "base map" of the area to be covered. Move a small RC servo with the camera mounted on to one of 32 positions and compare the ultrasonic distance measured at that position to the base map. If it varies by more than a certain amount then you know there is something that wasn't there before. If all readings are wrong then you know its raining
You could also have it so it self learns its environment over a certain period of time and adapts to minor changes.