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Using a plot leveling lazer to turn on a light? Answered

I have an uncle who want to make a light that will turn on when a senser come in parallel with a 360 degree plot level. to be attached to some heavy equipment to allow him to grade some property. any help? he was trying to avoid using a processer or computer, but whatever it takes to due it.

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steveastrouk
steveastrouk

Best Answer 8 years ago

Can you draw a picture of what he wants ?

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red9er
red9er

Answer 8 years ago

does this help? the laser hits the laser receiver, ( as i found out that's what they call them) and it either lights up or beeps. i want a light. (or a 3 light system, too high, right on, too low)

laser receiver.giflaser receiver2.gif
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steveastrouk
steveastrouk

Answer 8 years ago

Yeah, you need a strip of photodiodes and a fairly simple display. The trick is to eliminate the effects of sunlight, so you need to AC couple the diodes, so that "DC" effects - sunlight - doesn't affect the sensors. I did this sort of thing years ago with small solar cells from Edmund Scientific.

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red9er
red9er

Answer 8 years ago

how would the DC to AC be achieved? is there a webpage or an 'ible u could show me? ik a lot about electricity when it comes to car systems because i'm going to college to repair cars, so even a wiring diagram u could find would be helpful.

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steveastrouk
steveastrouk

Answer 8 years ago

Here's a rough idea for a very simple detector.
Use the smallest solar cells you can get.
Find out how fast the laser spins.
You need one of these circuits for every cell in a strip, as big as you need for the amount of error the laser will measure- which depends on the LARGEST spot size you can handle - or the longest range.
Connect an LED to the output of the logic gate via a resistor. It will pulse each time the laser hits it, and if the laser is spinning fast enough, it will look continuous.

laser detector.jpg
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red9er
red9er

Answer 8 years ago

nice idea, however, i hope it spins really fast or else it will be a very dim or even flickering light.

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frollard
frollard

Answer 8 years ago

Well, the laser is an existing commercial product, highly accurate and reliable.

As for the receiver it would be trivial to have multiple light sensors attached to horizontal tubes with filters on them to protect from ambient light.Perhaps a visual guide of where the light is hitting would be a better less technical option.

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steveastrouk
steveastrouk

8 years ago

True, but you can fix that with a couple of extra bits - add a diode and a capacitor at the output of the inverter. This will "hold" the LED on for a few more milliseconds.

See what happens.

Make a single channel, and go out and try it - see if you can get a good red filter for the laser colour too.

Steve

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steveastrouk
steveastrouk

8 years ago

Is the laser spinning in a circle, or static ?

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red9er
red9er

Answer 8 years ago

it would be one that spins in a circle