AW: [basicstamps] Some thing that will follow me around!!!!!!!!!!!!!!!??????
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Posts: 46,084
>Hi every one,
>
>I have an interesting request. I live in Florida and now it's
>getting hot here and I work in a BIG shop. It gets pretty hot inside.
>So i'm going to take a blower out of a air handler from a house A/C
>system and have it blowing at me, but I move around in a are about
>200 sqf and the most is 20' from the fan. And I need to figure out a
>way to have the fan turn were ever I go. I was think of using a
>small TX that's in my pocket and three antenas by the fan that will
>detect signal strenght and turn coresponding to the area were the
>signal it the strongest. Or some sort of the IR beacon on my head!?
>Throw me any feed back because I have never tried any thing like this
>and don't even know were to start. I never even heard one any one
>triyng to make some thing like this.
>
>Thanks every one
>
>Dennis
I've already constructed a similar device which works on the IR beacon idea.
I used two IR detectors - IS1U60. They contain an IR diode along with
circuitry which only repsonds to IR light modulated at 38Khz. This stops
them being triggered by ambient light. I mount the IR detectors in two
light-proof tubes mounted next to each other, facing in a parallel direction
right next to each other:
|
|D
|
|D
|
"D" represents the IR detectors.
When light is to either side of the centre these tubes it only impacts on
one IR dectector. When it is directly in front of the tubes both detectors
are set off. I mounted the tubes onto an RC servo and connected the detector
leads to the stamp. So very simply the stamp moves the servo and the
attached tubes/dectectors left or right when it only receives a single
signal.
Next I created a source of modulated IR light. I used an IR diode connected
to a 555 running in astable mode at 38Khz. Very simple and battery powered.
Use a diode with the 555 to get low duty cycle on the output to improve
battery life. To improve distance you would use a transistor to power the
LED, instead of straight from the 555.
There are a few limitations with IR. It must be line of sight. So if you
mounted the IR sourde on your body you'd have to use probably at least 4 IR
LED's so that the line of sight wasn't cut off when you turned your body
around. Also, reflections off objects in the room could pose a problem.
The other possible solutions may be PIR detectors in a similar setup.
Or maybe using "time of flight" with ultrasonic transucers to triangulate
position based on small delays between sensors.
Paul
_________________________________________________________________
Chat with friends online, try MSN Messenger: http://messenger.msn.com
>
>I have an interesting request. I live in Florida and now it's
>getting hot here and I work in a BIG shop. It gets pretty hot inside.
>So i'm going to take a blower out of a air handler from a house A/C
>system and have it blowing at me, but I move around in a are about
>200 sqf and the most is 20' from the fan. And I need to figure out a
>way to have the fan turn were ever I go. I was think of using a
>small TX that's in my pocket and three antenas by the fan that will
>detect signal strenght and turn coresponding to the area were the
>signal it the strongest. Or some sort of the IR beacon on my head!?
>Throw me any feed back because I have never tried any thing like this
>and don't even know were to start. I never even heard one any one
>triyng to make some thing like this.
>
>Thanks every one
>
>Dennis
I've already constructed a similar device which works on the IR beacon idea.
I used two IR detectors - IS1U60. They contain an IR diode along with
circuitry which only repsonds to IR light modulated at 38Khz. This stops
them being triggered by ambient light. I mount the IR detectors in two
light-proof tubes mounted next to each other, facing in a parallel direction
right next to each other:
|
|D
|
|D
|
"D" represents the IR detectors.
When light is to either side of the centre these tubes it only impacts on
one IR dectector. When it is directly in front of the tubes both detectors
are set off. I mounted the tubes onto an RC servo and connected the detector
leads to the stamp. So very simply the stamp moves the servo and the
attached tubes/dectectors left or right when it only receives a single
signal.
Next I created a source of modulated IR light. I used an IR diode connected
to a 555 running in astable mode at 38Khz. Very simple and battery powered.
Use a diode with the 555 to get low duty cycle on the output to improve
battery life. To improve distance you would use a transistor to power the
LED, instead of straight from the 555.
There are a few limitations with IR. It must be line of sight. So if you
mounted the IR sourde on your body you'd have to use probably at least 4 IR
LED's so that the line of sight wasn't cut off when you turned your body
around. Also, reflections off objects in the room could pose a problem.
The other possible solutions may be PIR detectors in a similar setup.
Or maybe using "time of flight" with ultrasonic transucers to triangulate
position based on small delays between sensors.
Paul
_________________________________________________________________
Chat with friends online, try MSN Messenger: http://messenger.msn.com