Microprocessors Tutorial 1:
Arduino Basics
Agenda
1. Arduino Hardware
2. Arduino Software
3. MAKE: Blink
4. Electronics
5. MAKE: LED control
6. Analog
7. MAKE: Volume control
8. Links
Arduino Hardware
Reset button
14 Digital
Pins (6 PWM)
USB
ATMega 328
Power
6 Analog Pins
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: Blink
Using built in LED, so no further electronics needed!
1. Connect Arduino
Windows 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 control
Hardware
1. Connect buses to bread board, 5v and GND
2. Connect LED,
pin->220ohm -> LED+ ->GND
1. Connect button,
5v ->button ->10kohm ->GND
before res ->pin
MAKE: LED control
Software
1. Declare 2 pins outside and set direction in setup()
2. Read button state
3. If button is on, write desired output to LEDs
Analog
Digital: 0-1, On/Off
LEDs, switches
digitalRead(), digitalWrite()
Analog: 0-1023
Potentiometer, sensor, motors
AnalogRead(), analogWrite()
Potentiometer: variable resistance
+5v
to pin
MAKE: Volume Indicator
Hardware
1. Add more LEDs, each going to a different pin
1. Connect potentiometer, center connection to pin
MAKE: Volume Indicator
Software
1. Add LED pin variables and set direction
2. Add pot pin, analog pin don't need direciton
3. Get pot value
4. Scale it using
map(number, origStart, origEnd, scaledStart, scaledEnd)
1. 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=pr
ojects
Adafruit ?
Questions? Comments? Suggestions?
academics@ieee.concordia.ca
ieee.concordia.ca