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--- digispark:tutorials:littlewire [2013/11/13 22:35]
digistump [Using external 1-wire deivces:]
+++ digispark:tutorials:littlewire [2016/06/09 12:03]
@@ Line 1: / Line 1: @@
-======Little Wire on Digispark Shield Kit Tutorial======
-=====Product Description:=====
-[[https://s3.amazonaws.com/digispark/images/m/lw1.jpg|{{https://s3.amazonaws.com/digispark/images/t/lw1.jpg}}]]
-[[https://s3.amazonaws.com/digispark/images/m/lw2.jpg|{{https://s3.amazonaws.com/digispark/images/t/lw2.jpg}}]][[https://s3.amazonaws.com/digispark/images/m/lw3.jpg|{{https://s3.amazonaws.com/digispark/images/t/lw3.jpg}}]]
-The Little Wire on Digispark Shield Kit connects provides a Little Wire compatible pinout on the Digispark. This allows the Digispark to be easily used as a Little Wire device, with the Little Wire firmware and libraries. The shield also provide pull-ups for the I2C lines, which can be enabled by an included jumper, and an external power jumper. The kit also includes a 6 pin IDC cable for connecting to other circuits or to standard 6-pin AVR ISP headers for programming AVR chips.
-Little Wire is multi-featured USB controlled Open Source Hardware tool packed in a minimal form factor designed by Ihsan Kehribar. Little Wire appears as a usbtinyisp device and provides a tethered interface between hardware and a computer.
-Little Wire has the following features:
-  * usbtinyisp compatible AVR programmer.
-  * 4 channel GPIO.
-  * ADC with 10 bit resolution.
-  * 2 parallel hardware PWM outputs.
-  * SPI interface.
-  * I2C interface.
-  * 1-Wire interface
-  * WS2812 RGB LED interface.
-  * Multiple device support.
-This is an unassembled kit and requires basic soldering. This is designed for use with the Digispark development board, which is not included.
-=====Parts:=====
-^ Part       ^ Quantity          ^Identification^
-| Little Wire Shield PCB|1| |
-| 6-pin IDC Cable|1| |
-| 4.7k ohm 1/4W 5% resistor|2| Brown - Black - Yellow|
-| 0.1" pitch Jumper/Shunt |2| |
-| 1x40pin male 0.1" pitch header| 22 pins worth| |
-**Soldering:** If you are new to soldering we recommend the following tutorials:
-Soldering Basics (http://www.sparkfun.com/tutorials/106) and Soldering Crash Course from the folks at Sparkfun (http://www.sparkfun.com/tutorials/354).
-How to solder from the Curious Inventor: http://store.curiousinventor.com/guides/How_to_Solder
-Adafruit has this excellent guide that starts with the tools needed and then shows detailed pictures, including some of the common problems that beginners experience (http://learn.adafruit.com/adafruit-guide-excellent-soldering).
-**We assume for these assembly instructions that you know the basics of thru-hole soldering. If you don't check out the links above, these boards are very easy to solder - we promise!**
-=====Assembly:=====
-Empty kit bag (or if using a raw PCB, acquire parts) and verify contents.
-**Note for Kickstarter Backers and Pre-orders:** Headers are not included in each kit bag, but the entire order came with more than enough headers for all kits.
-[[https://s3.amazonaws.com/digispark/images/m/lw1.jpg|{{https://s3.amazonaws.com/digispark/images/t/lw1.jpg}}]]
-Insert resistors. Solder the leads and clip off the excess.
-[[https://s3.amazonaws.com/digispark/images/m/lw2.jpg|{{https://s3.amazonaws.com/digispark/images/t/lw2.jpg}}]]
-Cut two lengths of male headers 3 pins long and insert (from the top) into the 6 pin (2x3 pins) header. Solder the pins on the back.
-[[https://s3.amazonaws.com/digispark/images/m/lw3.jpg|{{https://s3.amazonaws.com/digispark/images/t/lw3.jpg}}]]
-Cut a two lengths of male headers 2 pins long and insert (from the top) into the two jumper locations. Solder the pins on the back.
-[[https://s3.amazonaws.com/digispark/images/m/lw4.jpg|{{https://s3.amazonaws.com/digispark/images/t/lw4.jpg}}]]
-Place the jumper/shunt on top of each set of pins just soldered. Optional: Placing the jumper on the I2C pins connects the I2C pull-ups (remove if not using I2C). Placing one on the Ext. Power pins connects the 5V lien to the 6 pin header (remove if using external power).
-[[https://s3.amazonaws.com/digispark/images/m/lw5.jpg|{{https://s3.amazonaws.com/digispark/images/t/lw5.jpg}}]]
-If using the cable - plug into 6 pin header.
-[[https://s3.amazonaws.com/digispark/images/m/lw6.jpg|{{https://s3.amazonaws.com/digispark/images/t/lw6.jpg}}]]
-Cut a length of male headers 6 pins long and one 3 pins long. Insert into corresponding positions (on the bottom of the board) and solder each pin.
-[[https://s3.amazonaws.com/digispark/images/m/lw7.jpg|{{https://s3.amazonaws.com/digispark/images/t/lw7.jpg}}]]
-**Tip:** Inseting the headers into a breadboard and then placing the board on top can make this process easier.
-**Note:** If you are using stackable headers, use them here instead of the standard male headers.
-=====Loading the firmware:=====
-Download the Little Wire firmware installer for your platform here:
-Run the executable and when prompted plug in the Digispark that you will be using with the shield. When complete the Digispark will now appear as a Little Wire device 5 seconds after it is plugged into the computer.
-=====Programming:=====
-With the newest version of the Digispark Arduino IDE goto Examples->OneWire->Digispark Example
-This example uses P5 by default - to use P1 change this line: OneWire ds(5); to OneWire ds(1);

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