Hey! We are NCSU E101 012 FEDD Group 1: BFFFS!

We are:

• Jack Lynch
• Emerina Kelly
• Anam Navied
• Aaron Beaver
• Blake Goodman

This is our repository, where we keep the sketch that runs our project as well as all of our STL files.

Our machine can be operated two ways: digitally (with an Arduino) or in analog (with potentiometers). Both share a 5V rechargeable power source. The three-fan stack responsible for bubble-blowing airflow is linked independently to the 5V supply and is thus beyond user control, beyond switching power on/off. Switching operation methods requires reconfiguring the circuitry a bit (we left the Arduino control circuits on the breadboard so it's just a matter of re-plugging a few jumpers).

Digital operation involves an Arduino Uno taking input from a pushbutton (with a pulldown resistor) and driving the wheel motor with a 2N2222 NPN transistor (for handling the current draw) and a zener diode (for guarding against momentary voltage reversals).

The initializations are relatively simple:

 const int motorPin = 3;
 const int pullup = 2;
 const int LED = 13;
 const int UVleds = 4;

  pinMode(motorPin, OUTPUT);
  pinMode(pullup, INPUT_PULLUP);
  pinMode(LED, OUTPUT);
  pinMode(UVleds, OUTPUT);

and most of the circuit control happens within a single if-else block:

  int buttonVal = digitalRead(2);

  if (buttonVal == HIGH) {
    digitalWrite(LED, LOW);
    digitalWrite(UVleds, LOW);
    analogWrite(motorPin, 0);
  } else {
    digitalWrite(LED, HIGH);
    digitalWrite(UVleds, HIGH);
    analogWrite(motorPin, 255);
  }

The circuit illustrating potentiometer control of the UV LED and the bubble wheel is shown below.

One potentiometer controls LED intensity, and the other controls wheel speed.

Forthcoming! So that our project may be reproduced.