Little Wire
  • Little Wire
  • Little Wire
  • Little Wire

Little Wire

SKU AVR06071P
Little Wire is multi-featured USB controlled open source hardware tool packed in a minimal form factor designed by ihsan Kehribar
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Description
Little Wire is multi-featured USB controlled open source hardware tool packed in a minimal form factor designed by ihsan Kehribar. Even though it has minimal form factor, and packed with full of features; there aren’t any SMT components involved, therefore it is very suitable for beginners to assemble. 
 
This tool has to take instructions at run-time over USB. It can't work in a computer-less environment.
 
Note
V1.1 beta firmware released for the Little Wire. You can find the changelog and details from this link.
Features
  • USB controlled multi-tool with:
    • 4-channel digital input / output
    • ADC (10 bit resolution)
    • 2 parallel hardware PWM outputs  
    • SPI interface
    • I2C interface
  • USBtiny compatible AVR programmer
  • Printf style debugging over AVR-ISP pins
  • USB to UART converter (alternative firmware -- CDC-232 port)
  • Onboard serial bootloader for firmware upgrades 
  • Minimal form factor and all through-hole components
  • Open Source Hardware design
Applications
  • AVR programming /summon captainObvious 
  • LED dimming, color mixing  
  • General servo driving   
  • Pan and tilt servo control of a webcam for face tracking
  • With additional motor driver IC, 2 wheel robot driving   
  • Analog voltage recording and plotting
  • Controlling LED matrix displays by using SPI module to drive shift registers
  • USB to SPI bridge
  • USB to I2C bridge
  • USB to UART bridge
  • General purpose V-USB developement board
Packing list
  • 1 x Little Wire PCB
  • 1 x Pre-programmed Attiny85 chip.
  • 1 x 8pin IC socket
  • 1 x USB Male Type A connector
  • 2 x 3.6v zener diode
  • 2 x 100 nF capacitor
  • 2 x 27 Ohm resistor
  • 1 x 1.2 kOhm resistor
  • 1 x 150 ohm resitor
  • 1 x LED ( for power indication)
  • 1 x 2pin male header
  • 1 x 2pin jumper
  • 1 x (2x3)pin male header
Pinout
 
SilkscreenAVR-ISPPWM/ServoADCI2CSPICDC-232Bootloader
pin1MISOChannel_B--DOTXTX
pin2SCK-Channel_1SCLSCKRX 
pin3RESET-Channel_0*-CS- 
pin4MOSIChannel_A-SDADI-RX
Analog functionality on pin3 pin isn't stable but supported. Use it at your own risk.
 
Document Links
What is included?
  • Eagle schematic / layout files. Also in PDF format.
  • Microcontroller firmware files and makefile  
  • Bootloader source files
  • C function/header files for command line USB interface for Windows and Linux
  • C++ class for Windows and Linux 
  • Processing library for Windows ( With reduced feature set ... ) 
  • C# class for Windows USB interface ( in development ... )
  • Example C projects for almost every feature of the board
  • Example C++ projects for almost every feature of the board  
  • Example Processing projects
  • Example C# project for analog voltage plotting based on zedGraph
Note
 
Do not use the Adafruit USB VID/PID without written permission from Adafruit Industries, LLC and Limor "Ladyada" Fried (support@adafruit.com). Permission is granted for littlewire Ihsan Kehribar and Seeed Studio by Adafruit Industries, LLC to use the Adafruit USB VID/PID for littlewire.
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