This is a charlieplexing PCB. The figure is a black cat sitting on an unicorn ([on reddit](https://www.reddit.com/r/blackcats/comments/7opy9u/and_lo_i_saw_a_rider_on_a_pale_horse_and_the/)). The artwork was made by inkscape and EasyEDA.
A Tinkercad simulation with arduino compatible spaghetti code:
Accurate energy gauge for a SC E-Bike. Developed by Eugene, Faculty of Science and Engineering, University of Waikato.
Feel free to contact me for the C code for the project.
If one wishes to clone or use this project, please provide recognition of original designer.
<p>Decorate your house today with this Raspberry Pi (Zero) controlled shooting star.</p>
<p>Control each LED individually with the I²C 16 I/O expander.</p>
<p>By programming the Raspberry Pi (Zero) you can animate the shooting star as you wish.</p>
<p>The dark PCB makes it stand out even more.</p>
<p>You can order these PCBs at <a href="...
Water detector with 4 level stages. Each stage makes the 555 timer to give a supply period for the buzzer. The active buzzer transmits sound with a pause period between 0.5-3 seconds, depending on the level detected.