Let's Make Robots!

Modifying Parallax Ping)))

I'm wanting to make a small physical modification to a Parallax Ping))), however I'm not sure that it won't destory the component.

 What I'm wanting to do is create a backlight for the ping (such that it would look like glowing eyes). The way I imagine donig this is by drilling a small (maybe an 8th of an inch in diameter) hole in the side of each cylinder on the ping, and insert the the tip of a standard (or possibly smaller) sized LED into the hole from the outside. This should glow the inside of the cylinders fairly well, and should have a cool affect.

 But!, does anyone know if this with alter/destroy the function of the sensor? I have a feeling that it will. I see no reason all the ultrasonic sensors should be shaped as they are unless the shape is necessary for these components to function properly.



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I so wouldn't risk it...just put the led's on the outside or something.

Yeah, ultimately, you are probably right. I guess I was just waiting to see if someone would say "yeah, ive done something like that. It works. go for it." 

Its a cool idea though. Cool enough that i am suprised it hasnt been done before!

I'm pretty sure the metal "can" is just to protect the delicate innards of the sensor. Basically it's not unlike a little speaker in there, which would otherwise be very susceptible to smooshing.

If you do try to drill into the can, be very cautious not to go very deep, make sure the metal shards don't fall to the inside (speakers have magnets), and make sure the metal shards don't stay on any of the other unprotected electronic bits.

Yeah, I guess I was hoping those metal "cans" as you called them were aluminum (nonmagnetic).

You're right, they are aluminum (just held a magnet to mine).

Somewhere around here somebody disassembled the transducers, but I can't find the post right now...

Another thing you could try, order up some replacement ones and experiment on those. If it fails you're only out four bucks instead of 30. If it does work okay, and you're semi-handy with soldering, you could then swap in the modified one. Or use the parts towards building OddBot's Cheap Sonar.

edit = Cause, yeah, I think backlit eyes would look pretty slick too

Furthermore, I should have mentioned that I don't intend for the LED to enter the inside of the cylinder (or at least, not even enough to be visible by the naked eye).