Hello Fellow Sensor Enthusiasts,

Does anyone have experience with any of the following motion sensors or know of other ultra low power motion sensors?




Be kind as this is my first post and thanks for your input!

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What is it you are trying to sense? People? Animals? Things? How much power is available? What do you want to do if motion is detected? You can get floormats with tubing inside that compresses air to operate a switch when stepped on if you dont want to use any standby power.
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.
Sorry for the delay. Do you have experience with the PIR motion sensors indoors?
Jerome, thanks for your response.

Jerome Silverman said:
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.
We finished testing and as Jerome indicated, found PIR is suitable for indoor enclosed spaces only. The testing was done in an enclosed space where no sunlight was present. Our prototype reliably sensed presence and several other parameters including temperature, moisture content and voltage, processed and stored the data locally and reported status via bluetooth. The average power consumption (not including bluetooth transmissions) was below 5 mA.

Don't think we can use the video alarm systems due to the low power requirements and perhaps size.

If there is a technology to reliably sense human presence in a constantly varying outdoor environment using ultra low power in a small package, I would like to hear more about it.


Jerome Silverman said:
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.
There are a couple of other techniques but they are rather sophisticated. I am not sure about the power requirements. One involves a video camera and signature analysis software that can analyze the picture to determine what it is that is moving. The other involves pressure sensors under the ground and pressure signature analyisis software.

Anyone have experience with Monnit.com products?

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