Stroboscope
thingiverse
Stroboscope. This was made to check the fan speeds on a new computer build. Four leds from http://www.amazon.co.uk/gp/product/B008AGOLQA?psc=1&redirect=true&ref_=oh_aui_detailpage_o02_s00 are driven via a BC639 npn transistor from the arduino Microview.
Download Model from thingiverse
With this file you will be able to print Stroboscope with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on Stroboscope.