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Halloween Crow with illuminated eyes

by juewei, published

Halloween Crow with illuminated eyes by juewei Oct 16, 2016
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Summary

Imported all parts into FreeCAD and converted the meshes of head and tail to solids, so that they can be edited again.
The head got holes for the leds, the tail got a slot for sliding in the solar cell.
When printed at 43% size, the eyes fit for 5mm leds and the tail accommodates a solar cell 22mm x 56mm x 3mm. The crow is then 20cm from head to tail.

The cut parts are best printed without top and bottom layers and with concentric infill.
The infill can be removed with a pair of sharp pliers to make room for electronics and cables. The switch and charger socked are located behind the legs. I did not prepare holes in the body part for that, I cut them afterwards. Well....

Ehe electronics was taken from an inexpensive lamp, featuring a solar cell, battery, switch, and usb charger. The original white led was substituted for two ultrabright red leds. The original led resistor was 50 ohms, changed to 150 ohm for longer life.

All credits for the superb model go to http://whttp://www.thingiverse.com/danman/designs
-- thank you!

If it were not already cut in the 4 body parts, I'd have used https://github.com/fablabnbg/tinyboy/blob/master/stlcut.py for this.

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Thanks for getting back to me. I am gonna try and build this soon.

Can you provide links for the lamp and Red LEDs you used??

I would love to make this project!!!

Oct 24, 2016 - Modified Oct 24, 2016
juewei - in reply to mtkapp277

I had a hard time tracking down an active source for the lamps myself.
The lamp that I used is not really perfect. It does not autmatically switch between charging and giving light. It does both simultaneously. That means I need to switch it "off" during daytime, so that it survives the night. There are lamps that do that perfectly, like e.g. https://www.amazon.de/Solarleuchte-Gartenleuchte-Solarlampe-Edelstahl-16er/dp/B019COAO0K/ -- the solar cell probably does not fit, but you can compute a scale factor for the crow, once you know if the cell is wider or smaller than the 22mm I had on my cell. Or you do another remix and change the cutout :-)

For the LEDs, any modern ultrabright 5mm red LED should do.
E.g. http://www.ebay.com/itm/20-x-LED-5mm-Red-Candle-Flicker-Ultra-Bright-Flickering-LEDs-Light-Model-Prop-/161110488690 -- (I'd love to see a crow with flickering eyes! -- mine were normal continuous LEDs)

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