Need to reliably sense humans indoors/outdoors that are within 10 meters in any direction (360 degrees). The device is battery operated so minimum power consumption is required.
That would be rough, especially the outdoors part where other things can move around and the lighting can change and there are noises. It would require a variety of sensors and a logic system to detect and process the information. If it were not for the power requirement I would suggest a camera system with motion sensing and Internet connection for an alert.
Or you could fall back on older mechanical schemes that do not draw any standby power.
Bob Karl said:Need to reliably sense humans indoors/outdoors that are within 10 meters in any direction (360 degrees). The device is battery operated so minimum power consumption is required.
PIR sensor with fresnel lense and appropriate electronics will detect motion of objects warmer or cooler then the general background. The optics and shielding would determine the range and exclude things like pets at the floor level. One with sensitivity and timing adjustments would help to eliminate nuisance alarms. There are a huge variety of them available with all sorts of power and output options. The more controlled the environment is, the easier it is to implement an alarm system.
I have used PIR, ultrasonic, RF, video camera with motion sensing software. Each system has its drawbacks. Now there are video alarm systems that alert your cell phone and you can view the scene on the phone.
Anyone have experience with Monnit.com products?