A "Useless Box"
A "useless box, " whose only function is to turn itself off. This redesigned version also taps out a message in Morse code before retiring.
Flipping the switch leads to a voltage change on one of the Arduino pins, causing the Arduino to power the stepper motor that controls the acrylic "finger" accordingly.
Class-designed frame and circuitry. Original program control design and implementation
LED Cube
A programmable LED cube that takes advantage of multiplexing to gain individual control over each LED
An Arduino allows the user to select which LEDs to power on and off. The logic voltages produced by the Arduino control mosfet gates such that the Arduino is not directly powering the cube, preventing current overdraw.
Class design. Original program control design and implementation
Private contact information obscured
Solar-powered USB Charger
A solar-powered USB charger that enables mobile device charging
A small solar array charges a lithium ion battery which may be used to power a mobile device by USB.
Class design
EKG
EKG circuitry using an instrumentation amplifier and an operational amplifier to produce computer-displayable heart electrical signals when connected to electrodes in electrical contact with two separate body locations.
Class design
3D Printer Dual Mosfet Modification
The original electronics assembly that I used for my NinjaSlice 3D printer directed all current flow through the circuit board. To reduce the resulting stress on the circuit board I added a pair of mosfets.
These mosfets redirect the 15 amps needed for the heat bed and extruder through their own boards, which can not only better handle the current but are also less expensive to replace. I also replaced the stock 16 gauge wire with 12 gauge wire that can handle the current more reliably.
One of the mosfets prior to being secured to the frame
3D Printer PSU Cooling Fan
To cool my NinjaSlice 3D printer's power supply unit and prolong its effective lifespan I decided to add a cooling fan.
I spliced a pair of old phone chargers with appropriate amperage and voltage ratings to a computer fan and mounted the assembly directly adjacent to the power supply unit.
3D Printer Air Filtration System
3D printers are known to produce low levels of volatile organic compounds (VOCs) and ultra fine particles, especially when printing at higher temperatures.
To limit exposure, I adapted the "Hepa Filter for 3D Printer" by Thingiverse user jmillerfo for use with my 3D printing enclosure, extending the output vent and opting to use a pair of spliced phone chargers and a buck converter instead of a separate power supply unit.