Re: making a bot follow an invisible track

On Apr 20, 9:33 pm, Gordon McComb <NOSPAMg...@xxxxxxxxxxxxxxxxxx>
wrote:
Then I had the idea of doing it with a
small IR laser from the projection booth, but it wasn't bright enough.

-- Gordon


The light source doesn't need to be a laser. How about the light
source being a set of IR LED's, which are arranged in a
pattern(perhaps representing a binary number), then using a regular
lens to focus their light onto the screen. Alternatively, the LEDs
can be behind the screen. Perhaps they would shine through the screen
material, or small holes can be made for the light to come through.

Joe Dunfee

.

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