Sketching with Hardware

Day 2

Course Overview

Day 2

"Hello, Computer!"

II

Arduino

Arduino — Connected

Arduino provides (some) power

Arduino provides (some) power

Digital Input/Output

Digital Output

Blinking LED

void setup() {
	pinMode(12, OUTPUT);	// Make pin an output for us
}
void loop() {
	digitalWrite(12, HIGH);	// Set pin to be "+" (on)
	delay(500);
	digitalWrite(12, LOW);	// Set pin to be "-" (off)
	delay(500);
}

Digital Output

High Load!

Digital Output

Transistor / MOSFET

Digital Output

Transistor / MOSFET

Digital Output

Transistor / MOSFET

Digital Input

Pull a pin "up" (+)

void setup() {
	pinMode(2, INPUT);	// Make pin an input for us
}
void loop() {
	value = digitalRead(2);	// Read what's on that pin
}

Digital Input

Pull a pin "down" (-)

void setup() {
	pinMode(2, INPUT);	// Make pin an input for us
	digitalWrite(2, HIGH);	// Activate internal pull-up
}
void loop() {
	value = digitalRead(2);	// Read what's on that pin
}

Digital Input

Using a Bread Board

Analog Input/Output

Arduino Analog Input

int potPin = 2;	// select the input pin for the potentiometer
int ledPin = 13;	 // select the pin for the LED
int val = 0;	 // variable to store the value coming from the sensor

void setup() {
	pinMode(ledPin, OUTPUT);	// declare the ledPin as an OUTPUT
}

void loop() {
	val = analogRead(potPin);	// read the value from the sensor
	digitalWrite(ledPin, HIGH);	// turn the ledPin on
	delay(val);		// stop the program for some time
	digitalWrite(ledPin, LOW);	 // turn the ledPin off
	delay(val);		// stop the program for some time
}

Analog Output

PWM — Pulse Width Modulation

Analog Output

Analog Output: Servo

• PWM freq is 50 Hz (i.e. every 20 ms)
• Pulse width ranges from 1 to 2 ms
• 1 ms = full anti-clockwise position
• 2 ms = full clockwise position

Analog Output: Servo

Analog Output: Servo

"Servos, Oida!" ☺

Analog Output: RGB LED

photo credits © todbot.com

Pins: R G − − B B
GND = Cathode = −

Motor ansteuern

Sketching Circuits

CircuitLab

Circuit Simulator

EAGLE

Fritzing

More Sensors

• Light
• Temperature
• Distance (Infra Red, Ultra Sonic)
• Magnetic Sensors (Reed, Hall-Effect)

Actuators

• Motors
• Servos, Steppers
• Speakers
• Solenoids
• LEDs (RGB)
• Piezos

Topic ...

Topic:

IooT

Internet of old Things

Features

• Give old things some modern functions!
• Make things communicate!
• Think Steampunk!

Brainstorming!

Brainstorming!

• Project Name
• Main Idea
• Features

• Sensors? Actuators?
• Software? Complexity? Costs?
• Plan B?

Raus an die frische Luft!