Eye of newt, and toe of frog,
Wool of bat, and tongue of dog,
Adder's fork, and blind-worm's sting,
Lizard's leg, and howlet's wing,--
For a charm of powerful trouble,
Like a hell-broth boil and bubble.

This guide is based on the Uncanny Eyes project by Phil Burgess, with a Halloween-y twist.  We'll build an electronic eye as compact and small as possible.  Put it in a wide-mouthed jar and add it to your potion shelf, or attach a leather thong to wear it like a pendant around your neck.  

This is a fairly advanced project that requires fiddly soldering in a small space and uses delicate parts.  There's a good bit of software setup needed also.  You can add custom images and tweak the code if you'd like, or just copy and paste our code as-is.  It's not an easy project, but the end result is so incredibly cool that it's worth a bit of hard work!


1 x Teensy 3.2
Teensy 3.1 or 3.2 Microcontroller
1 x OLED Display
OLED Breakout Board 16 Bit Display
1 x Photo Cell
Photo cell CdS Photoreistor
1 x Battery Charger
LiPoly Backpack Battery Charger
1 x Battery
500 mAh LiPoly Battery
1 x 10k Resistor
10k Resistor
1 x On/Off Switch
SPDT Slide Switch

Other Stuff Needed

  • Hookup wire in 2 types / multiple colors:
    • Solid core wire 
    • Silicone stranded wire
  • Soldering iron & accessories
  • Hot glue gun
  • Reptile print or halloween fabric
  • Wide mouth jar or necklace cord
  • 1.5" acrylic half-sphere (less expensive at your local Tap Plastics)
  • Needle & thread

This guide was first published on Oct 19, 2017. It was last updated on Oct 19, 2017.

This page (Introduction) was last updated on Jan 12, 2021.