Output Device Examples / Concepts

Topics:

• LEDs
  • RGB
  • Arrays / Charlieplexing
• Motors
  
  

LEDs

Concepts: All About LEDs

http://learn.adafruit.com/all-about-leds

Hello RGB

RGB LED Concepts:

http://www.tumblr.com/tagged/how-do-rgb-leds-work

Arduino Code Example:

http://fab.cba.mit.edu/classes/863.12/people/sophia/project11.html

Hello LED Array (Charlieplexing)

Charlieplexing / LED Array Concepts:

http://www.instructables.com/id/Charlieplexing-LEDs--The-theory/

Vinyl Cutter LED Array (big):

http://www.instructables.com/id/light-circuit/

Programming LED Array in C (changing the code):

http://academy.cba.mit.edu/2012/students/lubsen.astrid/Assignment13.html

Arduino Charlieplexing Library:

http://playground.arduino.cc/code/charlieplex

Charlieplexed RGB LEDs in Arduino style C:

http://academy.cba.mit.edu/2012/students/holt.joshua/JH_week13.html

Board in Action

Programming Hello LED Array with the FabISP

To Flash the Microntroller:

To program your Hello LED Array - download all the files, under LED array.

I am using a ATtiny44:

sudo make -f hello.array.44.make program-usbtiny

If Working - This is the Terminal Output Produced

avr-objcopy -j .text -O ihex hello.array.44.out hello.array.44.c.hex;\
avr-size --mcu=attiny44 --format=avr hello.array.44.out
AVR Memory Usage
----------------
Device: attiny44

Program:     358 bytes (4.4% Full)
(.text + .data + .bootloader)

Data:          1 bytes (0.2% Full)
(.data + .bss + .noinit)


avrdude -p t44 -P usb -c usbtiny -U flash:w:hello.array.44.c.hex

avrdude: AVR device initialized and ready to accept instructions

Reading | ################################################## | 100% 0.01s

avrdude: Device signature = 0x1e930c
avrdude: NOTE: FLASH memory has been specified, an erase cycle will be performed
         To disable this feature, specify the -D option.
avrdude: erasing chip
avrdude: reading input file "hello.array.44.c.hex"
avrdude: input file hello.array.44.c.hex auto detected as Intel Hex
avrdude: writing flash (358 bytes):

Writing | ################################################## | 100% 1.08s



avrdude: 358 bytes of flash written
avrdude: verifying flash memory against hello.array.44.c.hex:
avrdude: load data flash data from input file hello.array.44.c.hex:
avrdude: input file hello.array.44.c.hex auto detected as Intel Hex
avrdude: input file hello.array.44.c.hex contains 358 bytes
avrdude: reading on-chip flash data:

Reading | ################################################## | 100% 0.68s



avrdude: verifying ...
avrdude: 358 bytes of flash verified

avrdude: safemode: Fuses OK

avrdude done.  Thank you.

Motors

Different types of Motors (Overview):

• http://www.electronicsteacher.com/robotics/robotics-tutorial/beginners-robotics/motors.php
• http://www.arrickrobotics.com/motors.html
• http://www.instructables.com/id/How-To-Motors/

DC Motors Concepts: H-Bridge / PWM

• http://www.societyofrobots.com/schematics_h-bridgedes.shtml
• http://roko.ca/robotics/h-bridge-fundamentals/2

MOSFETS (for switching large loads, like motors)

• http://reibot.org/2011/09/06/a-beginners-guide-to-the-mosfet/
• http://bildr.org/2011/03/high-power-control-with-arduino-and-tip120/

Finding Stepper Motor Coil Pairs (for wiring):

• http://bildr.org/?s=high+power+control (at bottom of the page).

Great Resources from Paul Badger's RISD Physical Computing Classes

• http://dm.risd.edu/pbadger/PhysComp/pmwiki/pmwiki.php?n=Devices.Devices
• http://dm.risd.edu/pbadger/AM/pmwiki/pmwiki.php?n=Main.Week1
• http://dm.risd.edu/pbadger/robo/

Arduino Servo Library

• http://arduino.cc/en/Reference/Servo
• http://playground.arduino.cc/ComponentLib/servo

Hello Stepper

If the stepper board is not working. I test the following:

• Wires are wired in the wrong order -- try swapping them
• Step pulses are too short for the motor -- try making them longer
• Step current is too low for the motor -- try increasing PWM current
• Not all MOSFETs working -- try probing with scope