Author Topic: Passive Infared  (Read 1203 times)

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Offline Joker94Topic starter

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Passive Infared
« on: August 24, 2009, 01:05:39 AM »
What do people think of passive innfared sensors. In particular the two at the top of the page,the unmounted ones.

Has any body used these and have an opinion, I have not go a plan to use them just want to see what people think. And or if it is worth getting one or two and experimenting witht them on my robot.

http://www.futurlec.com.au/PIR_Sensors.jsp

Offline chelmi

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Re: Passive Infared
« Reply #1 on: August 24, 2009, 07:36:34 AM »
What do people think of passive innfared sensors. In particular the two at the top of the page,the unmounted ones.

Has any body used these and have an opinion, I have not go a plan to use them just want to see what people think. And or if it is worth getting one or two and experimenting witht them on my robot.

http://www.futurlec.com.au/PIR_Sensors.jsp


LadyADA published a tutorial about PIR just a few days ago:
http://www.ladyada.net/learn/sensors/pir.html

Now concerning using it on a robot, I don't think it would work. PIR detect motion of IR emitting bodies. The problem is, your robot itself is moving! the sensor will detect motion all the time!

Chelmi.

Offline Joker94Topic starter

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Re: Passive Infared
« Reply #2 on: August 24, 2009, 05:44:24 PM »
thanks chelmi. I was having the same thoughts as you , the reason i posted to double check other people oppinions.

Offline airman00

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Re: Passive Infared
« Reply #3 on: August 24, 2009, 06:03:30 PM »
worse thing about PIR is that it only detects changes in heat, so if its pointing at a fire that wouldn't be a change in heat, since the heat remains the same.
Well I guess thats not technically true since the definition of heat is transfer of energy due to a difference in temperature, so the fire, assuming it and its area were at a constant temperature, wouldn't have heat... but i digress....
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Offline Ro-Bot-X

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Re: Passive Infared
« Reply #4 on: August 24, 2009, 07:34:45 PM »
This is the reason I opted for the most expensive sensor on my robot: Thermopile Array. This sensor detects temperature of warm objects, including humans, pets, TVs, monitors, PCs, anything that is warmer than ambient temperature. And it has 8 sensors in one, with a total of 41 degrees angle. Simple I2C interface, you get ambient plus 8 temperature readings. Also you can connect a servo to it to pan (or tilt) the sensor. The cheapest place I found this sensor is at HVWtech: http://www.hvwtech.com/products_view.asp?ProductID=947 for $99.50.
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Offline Joker94Topic starter

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Re: Passive Infared
« Reply #5 on: August 24, 2009, 08:34:09 PM »
The only problem is that i don't have $100 to spend on a sensor :(

 


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