Microprocessors Tutorial 1:Arduino Basics

Agenda

1. Arduino Hardware2. Arduino Software3. MAKE: Blink4. Electronics5. MAKE: LED control6. Analog7. MAKE: Volume control8. Links

ATMega 328

6 Analog Pins

14 Digital Pins (6 PWM)

USB

Reset button

Power

Arduino Hardware

Arduino Software

Menu bar: set device, port, find examples

Code: setup(), set pin direction pinMode(pin, IN/OUTPUT) loop(), set pin value with digitalWrite(led, HIGH/LOW)Or get pin value with digitalRead(pin)

Buttons: verify and upload code

MAKE: BlinkUsing built in LED, so no further electronics needed!

1. Connect ArduinoWindows driver found?

Correct port?

2. Upload code

Electronics

Breadboard: vertical connections, horizontal buses

LEDs: polarized, long == +

Resistor: Color-coded. Need one for LED

Push Button: completes circuit only while pushed. Use a pull down resistor!

MAKE: LED controlHardware1. Connect buses to bread board, 5v and GND2. Connect LED, pin->220ohm -> LED+ ->GND3. Connect button, 5v ->button ->10kohm ->GND

before res ->pin

MAKE: LED controlSoftware1. Declare 2 pins outside and set direction in setup()2. Read button state3. If button is on, write desired output to LEDs

Software1. Declare 2 pins outside and set direction in setup()2. Read button state

AnalogDigital: 0-1, On/Off LEDs, switches digitalRead(), digitalWrite()

Analog: 0-1023 Potentiometer, sensor, motors AnalogRead(), analogWrite()

Potentiometer: variable resistance

to pin

+5v

MAKE: Volume IndicatorHardware1. Add more LEDs, each going to a different pin

2. Connect potentiometer, center connection to pin

MAKE: Volume IndicatorSoftware1. Add LED pin variables and set direction2. Add pot pin, analog pin don't need direciton3. Get pot value4. Scale it using map(number, origStart, origEnd, scaledStart, scaledEnd)5. If pot level is higher than LED indicator, write desired output

to LED

Useful Links

Arduino Examples http://arduino.cc/en/Tutorial/HomePage

MAKE projects http://makezine.com/arduino/http://makezine.com/category/electronics/arduino/?post_type=projects

Adafruit ?

ieee.concordia.caacademics@ieee.concordia.ca

Questions? Comments? Suggestions?