So I've recently made a small device for the visually impaired. I etched my own circuit, programmed an ATmega328, and 3d printed a case.
The idea of the product is that a visually impaired person would clip this onto their belt/pants (similar to a glucose meter for diabetics) and there is two vibration motors on the back of the case that would be touching the users clothes. The HC-SR04 Ultrasonic Ping Sensor is mounted on a micro servo which rotates 100 degrees. As the sonar is rotating, each time it receives its echo it vibrates the corresponding vibration motor. (Left for x<50, right for x>60, and both for 50>x<60.
To get back on point, I was wondering if you guys knew any good places to get these parts manufactured. I can probably imagine that my main issue would be only getting one or two manufactured. Maybe I could get each subassembly manufactured by itself? Or do any of you know a good place that could do it if I give them all the necessary files (gerber, stl, etc).
My main issue is the sloppiness and difficulty that I had to put this together. I figure it'd be much cleaner to get it professionally made.
sloppyness? i think this looks very professional man. Also is it to tell people if they are near an object and help them avoid it? if so that is a great idea to make the visually impaired feel more independent.
What etching method did you use? What DPI is your printer, and how are the results with it? I recently purchased a cheap HP laserjet pro with the intended purpose of etching circuit boards, but I printed out a couple test circuits and the toner let way too much light through, so I knew it wasn't going to cut it, and had to send it back. I believe it printed at like 400x600 DPI. I'm looking for a new one that prints at 1200x1200 DPI. Any suggestions?
Jammy, I think it's the Case that makes it look so clean, the inside is quite a mess. And, yes they clip onto their belt and its a hands-free object detection device with the frequency of the vibrations to correspond with the distance from objects.
Resistor, I used the laser printing method. I have an HP LaserJet p1505n which can print at 600x600 DPI or 1200 'fastres'. I think I alternated, and both worked well with a monochrome image of the traces from EagleCad. A really big part is the paper you're using. I've done both transparency and Kodak Photo Paper. Both have worked well, but the Photo Paper takes much longer to transfer onto the copper.
make sure you use the slower printing method (very high quality), do two or more passes using transparent projector paper, if it stills let too much light, you can use two layers of paper (if you use the UV light reacting protective layer, sodium hydroxide, iron perchlorate, acetone method).
shoot me an email with your files and i would be happy to work with you to get this sucker ready for manufacturing, you already have the proof of concept all you need is some engineering and sourcing to make some mass production quality samples for marketing and such. this is what i do for a living but it would be my pleasure to help out a fellow Tek syndicate member. my email is (sent to IM)
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