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Motion Sensor with LED's

Hi,

Im having some difficulty trying to make a circuit.
I want to create a desk lamp which only switches on/off when you wave
your hand across the sensor.

I will be using
4x AAA batteries 1.5v Each 1150mAh
8 LED 3.6 Forward Volts - 20mAh
120 ohm Resistors

Not sure about the sensor and other components..

Please can someone help me specify the materials and circuit layout.

Thanks
 
R

Roger Dewhurst

Jan 1, 1970
0
Hi,

Im having some difficulty trying to make a circuit.
I want to create a desk lamp which only switches on/off when you wave
your hand across the sensor.

I will be using
4x AAA batteries 1.5v Each 1150mAh
8 LED 3.6 Forward Volts - 20mAh
120 ohm Resistors

Not sure about the sensor and other components..

Please can someone help me specify the materials and circuit layout.

Thanks

There are at least five thick volumes of 'Encyclopedia of Electronics' or
'Electronic Circuits' or some similar name. The author/collator or whatever
has a short name which begins with G. I cannot remember any more detail but
go to your local public library and have a search through the books on
electronics. These will be the largest, fattest, books on the shelf. There
are circuits for everything in those books.

R
 
Hi,

Im having some difficulty trying to make a circuit.
I want to create a desk lamp which only switches on/off when you wave
your hand across the sensor.

I will be using
4x AAA batteries 1.5v Each 1150mAh
8 LED 3.6 Forward Volts - 20mAh
120 ohm Resistors

Not sure about the sensor and other components..

Please can someone help me specify the materials and circuit layout.

Thanks

You can use a simple infrared emitter diode and a photo-transistor
like detector. You need modulate the signal if you don't want to have
problems with other light/infrared sources like sunlight.

PH
 
M

me

Jan 1, 1970
0
[email protected] wrote in @j27g2000cwj.googlegroups.com:
Hi,

Im having some difficulty trying to make a circuit.
I want to create a desk lamp which only switches on/off when you wave
your hand across the sensor.

I will be using
4x AAA batteries 1.5v Each 1150mAh
8 LED 3.6 Forward Volts - 20mAh
120 ohm Resistors

Not sure about the sensor and other components..

Please can someone help me specify the materials and circuit layout.

Thanks

An excellent sensor for this application would be single pole single throw
switch, as you wave your hand make contact with switch to turn on or off...
 
J

John Popelish

Jan 1, 1970
0
You can use a simple infrared emitter diode and a photo-transistor
like detector. You need modulate the signal if you don't want to have
problems with other light/infrared sources like sunlight.

Or the light from the lamp.
 
J

Jonathan Kirwan

Jan 1, 1970
0
[email protected] wrote in @j27g2000cwj.googlegroups.com:


An excellent sensor for this application would be single pole single throw
switch, as you wave your hand make contact with switch to turn on or off...

hehe. Yes. But it might be a medical application where sterilized
hands shouldn't make contact... In that case, I agree with modulation
for the emitter and narrow-band filtering suggestions for the
receiver. Must be ICs out there for this, already.

Jon
 
J

Jonathan Kirwan

Jan 1, 1970
0
You can use a simple infrared emitter diode and a photo-transistor
like detector. You need modulate the signal if you don't want to have
problems with other light/infrared sources like sunlight.

Optical filtering would help, as well.

Jon
 
J

Jonathan Kirwan

Jan 1, 1970
0

I can suggest some thoughts that were crossing my mind:

(1) Ambient light striking the detector may present a significant
level of current that is unrelated to the received signal. Reducing
the level, by narrowing the angle of acceptance or filtering against
wavelength or using polarization to advantage can aid design and
robustness to varying ambient conditions.

(2) Designing lenses for a narrow wavelength range may be easier, if
they are used.

Among others. There were more crossing my mind.

Jon
 
J

James Thompson

Jan 1, 1970
0
Jonathan Kirwan said:
hehe. Yes. But it might be a medical application where sterilized
hands shouldn't make contact... In that case, I agree with modulation
for the emitter and narrow-band filtering suggestions for the
receiver. Must be ICs out there for this, already.

Jon
Easy way would be to use the ir remote receiver module and place an IR led
beside it ( pointing same direction ) running from a 40khz oscillator. The
remote receiver module should have the light filter on it already. You will
need also additional circuitry (flip flop and relay driver) to operate the
light.
 
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