Intro to Arduino

Each Group Collect

Digital Multimeter
Variable Voltage Power Supply
Bana Plug Leads
Resistors
DC Motor

What is Electricity?

A general understanding of electricity and the rules that determine how it flows and how it can be controlled are crucial to quickly prototyping your designs. These resources cover the fundamentals of working with electricity.

Tom Igoe: Understanding Electricity
Sparkfun: Voltage, Current, Resistance and Ohm’s Law
ITP: Electricity, the Basics
Voltage is the difference in charge between two points.
Current is the rate at which charge is flowing.
Resistance is a material’s tendency to resist the flow of charge (current).

Water analogy from Sparkfun

Voltage = Pressure in system

Current (Amperage) = Amount of Flow

Resistance = Resistance to Flow

V = I * R (voltage = current * resistance)

I = V / R (current = voltage / resistance)

Solve for LED / Resistor Combo

We know the ideal forward voltage (Vf) and current (I) of the LED.

Target Vf = 3.3v

Target I = 20mA (0.02A)

V = I * R

R = (Vs – Vf) / I

Exercise 1: Learn the Digital Multimeter (DMM)

Sparkfun: How to Use a Multimeter

Set up a simple circuit on a breadboard with an LED, a resistor, and the variable voltage power supply:
1. Anode (+) [because Node.js is positive/great]
2. Cathode (-) [because cats are negative/terrible]
Set the power supply to 5V
Use the the DMM to measure voltage at different points of the circuit
Notice the amount of current being used by the power supply
Insert the DMM into the circuit and measure the amount of current (see if it matches what the power supply says)
What happens if you change the resistor?
Add a switch or button
Draw the [circuit diagram](https://learn.sparkfun.com/tutorials/how-to-read-a-schematic) on the table

What is Arduino?

A simple microcontroller and software combo developed to help designers, artists and non-engineers rapidly prototype with electronics.

Some things to remember:

Analog Pins are for reading only (0v – 5v)
analogRead(pinNumber) returns an integer value between 0 – 1023
Digital Pins can be INPUT or OUTPUT
1. digital pins can supply a low-current (100mA) 5v supply in output mode: digitalWrite(pin, HIGH/LOW);
2. digital pins can read the state of that pin, as either HIGH or LOW (5v or 0v): digitalRead(pin);
You can run the arduino WITHOUT the USB cable attached (only a 5v-24v barrel jack)
1. You can also power from the Vin and GND pins.

Exercise 2: Set up Arduino & Blink

Download the Arduino IDE
Follow the Getting Started guide for the Arduino UNO (word for word!)
Run the Blink! example sketch
1. Open Examples > Basics > Blink
2. Plug your Arduino into the computer
3. Choose your board: Tools>Board
4. Choose the correct port: Tools>Port
5. Click the check icon (verify)
6. If no errors, upload to the arduino

Exercise 3: Reading Data & Graphing it

Upload the Standard Firmata to your Arduino (check out File>Examples>Firmata>StandardFirmata)
Make sure you have the Arduino(Firmata) library (you can download this from the Sketch>Import Library>Add Library… menu)
In Processing and copy/paste this code:

/*
arduino_input

Demonstrates the reading of digital and analog pins of an Arduino board
running the StandardFirmata firmware.

To use:
* Using the Arduino software, upload the StandardFirmata example (located
  in Examples > Firmata > StandardFirmata) to your Arduino board.
* Run this sketch and look at the list of serial ports printed in the
  message area below. Note the index of the port corresponding to your
  Arduino board (the numbering starts at 0).  (Unless your Arduino board
  happens to be at index 0 in the list, the sketch probably won't work.
  Stop it and proceed with the instructions.)
* Modify the "arduino = new Arduino(...)" line below, changing the number
  in Arduino.list()[0] to the number corresponding to the serial port of
  your Arduino board.  Alternatively, you can replace Arduino.list()[0]
  with the name of the serial port, in double quotes, e.g. "COM5" on Windows
  or "/dev/tty.usbmodem621" on Mac.
* Run this sketch. The squares show the values of the digital inputs (HIGH
  pins are filled, LOW pins are not). The circles show the values of the
  analog inputs (the bigger the circle, the higher the reading on the
  corresponding analog input pin). The pins are laid out as if the Arduino
  were held with the logo upright (i.e. pin 13 is at the upper left). Note
  that the readings from unconnected pins will fluctuate randomly. 
  
For more information, see: http://playground.arduino.cc/Interfacing/Processing
*/

import processing.serial.*;

import cc.arduino.*;

Arduino arduino;
int potPin = 0;
int LEDPin = 6;



void setup() {
  size(470, 280);

  // Prints out the available serial ports.
  println(Arduino.list());
  
  // Modify this line, by changing the "0" to the index of the serial
  // port corresponding to your Arduino board (as it appears in the list
  // printed by the line above).
  arduino = new Arduino(this, Arduino.list()[0], 57600);
  
  // Alternatively, use the name of the serial port corresponding to your
  // Arduino (in double-quotes), as in the following line.
  //arduino = new Arduino(this, "/dev/tty.usbmodem621", 57600);
  
  arduino.pinMode(LEDPin, Arduino.OUTPUT);
 
}

void draw() {
  background(0);
  stroke(255);
  
  // Draw a filled box for each digital pin that's HIGH (5 volts
  int potVal = arduino.analogRead(potPin);
  
  //map the values from 0-1023 to 0-255
  int mappedVal = (int)map(potVal, 0, 1023, 0, 255);
  
  arduino.analogWrite(LEDPin, mappedVal);
  
  // Draw a circle whose size corresponds to the value of an analog input.
  noFill();
  int circleDiameter = arduino.analogRead(potPin) / 16;
  ellipse(width/2, height/2, circleDiameter, circleDiameter);
  
}

arduino_input

Demonstrates the reading of digital and analog pins of an Arduino board

running the StandardFirmata firmware.

To use:

* Using the Arduino software, upload the StandardFirmata example (located

in Examples > Firmata > StandardFirmata) to your Arduino board.

* Run this sketch and look at the list of serial ports printed in the

message area below. Note the index of the port corresponding to your

Arduino board (the numbering starts at 0). (Unless your Arduino board

happens to be at index 0 in the list, the sketch probably won't work.

Stop it and proceed with the instructions.)

* Modify the "arduino = new Arduino(...)" line below, changing the number

in Arduino.list()[0] to the number corresponding to the serial port of

your Arduino board. Alternatively, you can replace Arduino.list()[0]

with the name of the serial port, in double quotes, e.g. "COM5" on Windows

or "/dev/tty.usbmodem621" on Mac.

* Run this sketch. The squares show the values of the digital inputs (HIGH

pins are filled, LOW pins are not). The circles show the values of the

analog inputs (the bigger the circle, the higher the reading on the

corresponding analog input pin). The pins are laid out as if the Arduino

were held with the logo upright (i.e. pin 13 is at the upper left). Note

that the readings from unconnected pins will fluctuate randomly.

For more information, see: http://playground.arduino.cc/Interfacing/Processing

import processing.serial.*;

import cc.arduino.*;

Arduino arduino;

int potPin = 0;

int LEDPin = 6;

void setup() {

size(470, 280);

// Prints out the available serial ports.

println(Arduino.list());

// Modify this line, by changing the "0" to the index of the serial

// port corresponding to your Arduino board (as it appears in the list

// printed by the line above).

arduino = new Arduino(this, Arduino.list()[0], 57600);

// Alternatively, use the name of the serial port corresponding to your

// Arduino (in double-quotes), as in the following line.

//arduino = new Arduino(this, "/dev/tty.usbmodem621", 57600);

arduino.pinMode(LEDPin, Arduino.OUTPUT);

}

void draw() {

background(0);

stroke(255);

// Draw a filled box for each digital pin that's HIGH (5 volts

int potVal = arduino.analogRead(potPin);

//map the values from 0-1023 to 0-255

int mappedVal = (int)map(potVal, 0, 1023, 0, 255);

arduino.analogWrite(LEDPin, mappedVal);

// Draw a circle whose size corresponds to the value of an analog input.

noFill();

int circleDiameter = arduino.analogRead(potPin) / 16;

ellipse(width/2, height/2, circleDiameter, circleDiameter);

}

Find a sensor (Potentiometers are a good one)
Attach it to the Analog pins of your Arduino (You may need to find a diagram/datasheet/instructions on the internet)
Run the Processing sketch!

Intro to Arduino

Each Group Collect

What is Electricity?

Water analogy from Sparkfun

Solve for LED / Resistor Combo

Exercise 1: Learn the Digital Multimeter (DMM)

What is Arduino?

Some things to remember:

Exercise 2: Set up Arduino & Blink

Exercise 3: Reading Data & Graphing it

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Each Group Collect

What is Electricity?

Water analogy from Sparkfun

Solve for LED / Resistor Combo

Exercise 1: Learn the Digital Multimeter (DMM)

What is Arduino?

Some things to remember:

Exercise 2: Set up Arduino & Blink

Exercise 3: Reading Data & Graphing it

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Leave a Reply Cancel reply