Parts List
2ft x 4ft plywood, 3/8in thick. Home Depot, $15
PVC piping, 1/2 inch diameter.
Coupling to connect two 1/2in PVC pipes.
1in x 2in support strut
11in zipties used to fasten supports and solenoids.
The Teensy is a 24-pin USB-based microcontroller.
The HC-SR04 Ultrasonic module is capable of detecting distance within a 3mm accuracy. It has a range between 2cm and 4m. SainSmart, $5.19
The SH-V0829BC-R is a 12V, normally-closed solenoid vale scavenged from a Keurig coffee maker. American Science and Surplus,$3.74
6x6x6mm normally open tact switches. microtivity, $5.99 for 12
20ft of 1/8in vinyl tubing, food-safe.
#3 rubber stoppers. Top diameter of 15/16in, bottom diameter of 11/16in, hole diameter 3/16in.
Brass fitting to connect tubing to stoppers, 1/8in diameter.
- AC Transformer
- MOSFET Transistors
- Linear Regulator
- Assorted electronic components (LEDs, diodes, resistors, etc.)