Created October 19, 2015

Homework 5

This homework submission has two components: a simple circuit board, and an automated drawing machine using a servo motor.

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Drawing Machine
I drew out several potential projects before settling on this one, so the last two pages correspond to the finished product. The machine itself draws a series of curves of increasing size. Here, I used it to draw a rainbow. I originally intended to make my design adjustable, and able to hold several different diameters of drawing utensils. After prototyping, however, I found that the material I was working with was too brittle. Instead, I opted to use rubber bands, which make for a highly adjustable design. I entertained the idea of making the marker-holding section sturdier by adding a second level, but found that leaving it flexible actually made for a better line. The box that the servo and attached arm sit on is weighted down by stacked pieces of board, but this still proved to be too light weight. as a simple solution, I clamped to to my drawing surface. It works quite well!
Below are the sketchbook pages, my ai. file, and pictures/videos of the finished product.

1 / 4 • page 3-- drawing arm

Ai. file (actual file attached below)

1 / 2 • close up of apparatus

Circuit Board

My circuit board projected presented some challenges. Firstly, it took me several attempts before my soldering was acceptable, so the board itself was a bit of a mess. (but a good learning experience!). I worked too quickly, and despite being careful, I still managed to order two of the LEDs incorrectly, so that the negative sides were facing the wrong way. Additionally, I wired the connections for my servo motor extremely unconventionally after I made an error I couldn't go back and fix. The LED in the center woks! However, I could not get it to work with the very simple Blink example program. Instead, I found a tutorial with this code, that I was able to modify. Using this code, the LED worked.

Code Source: https://www.arduino.cc/en/Tutorial/ForLoopIteration

Rough Schematic

Extra project:
I re-did my "Flight School" project, now it works!

Circuit Board Project Code-- Blinking LED

int timer = 100;           // The higher the number, the slower the timing.

void setup() {
  // use a for loop to initialize each pin as an output:
  for (int thisPin = 2; thisPin < 9; thisPin++) {
    pinMode(thisPin, OUTPUT);
  }
}

void loop() {
  // loop from the lowest pin to the highest:
  for (int thisPin = 2; thisPin < 7; thisPin++) {
    // turn the pin on:
    digitalWrite(thisPin, HIGH);
    delay(timer);
    // turn the pin off:
    digitalWrite(thisPin, LOW);
  }

  // loop from the highest pin to the lowest:
  for (int thisPin = 7; thisPin >= 2; thisPin--) {
    // turn the pin on:
    digitalWrite(thisPin, HIGH);
    delay(timer);
    // turn the pin off:
    digitalWrite(thisPin, LOW);
  }}

Credits

Maggie George

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Homework 5

Homework 5

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Code

Circuit Board Project Code-- Blinking LED

Credits

Maggie George

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