Differences

This shows you the differences between two versions of the page.

--- avr:t85:littlewire [2014/01/31 10:08] – [PCB] redox
+++ avr:t85:littlewire [Unknown date] (current) – removed - external edit (Unknown date) 127.0.0.1
@@ Line 1: / Line 1: @@
-# LittleWire
-# Overview
-I can't think of anything to add to the official description of the LittleWire. For me, it's a cool tool to build, and a cool tool to have on hand, mostly for programming AVR chips.
-* __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.
-# Perfboard
-A while back, I used a round piece of perfboard to make a smd-like LittleWire... No schematics, it's directly inspired from the Schematic of the Little Wire. The only difference is: D+ and D- are swapped to make it easier to solder...
-{{:avr:t85:littlewire:small_img_20120717_000956.jpg?direct&200|}} {{:avr:t85:littlewire:small_img_20120717_001010.jpg?direct&200|}} {{:avr:t85:littlewire:small_img_20120717_001021.jpg?direct&200|}}
-It's a little bit messy, but it worked, and still does its job !
-# SMD
-I was a little bored and wanted to practice SMD soldering, just for fun. So I made an SMD version of the LittleWire.
-* Small footprint
-* MiniUSB connector
-* Easy to use header => Can be plugged in a breadboard !
-* Micronucleus bootloader
-## PCB
-I still haven't made a schematic, so please, refer to the annotated PCB to assemble the board.
-Sorry, it's a little bit crowded, but everything should fit nicely... 600 DPI image, as usual around here...
-{{:avr:t85:littlewire:smdlittlewire.jpg?direct&150|}} {{:avr:t85:littlewire:smdlittlewire_components.jpg?direct&150|}}
-Pin 1 of the Attiny is on the top left of the PCB, near D3
-## Components
-Required
-* D1, D2: 3.6v Zener Diodes
-* R1, R2: 39 Ohms
-* R3: 1.5 kOhms
-* C1: 1 µF
-* Attiny85
-* 6 Pins Header, straight
-* MiniUSB connector
-Optional
-* C2: 68 nF
-* D3: Blue LED
-* R4: 1 kOhms
-## Pinout
-Pin 1 is the closest to the USB port. The pinout is then:
-. Vcc
-. Gnd
-. /Reset
-. SCLK
-. MISO
-. MOSI
-Once you get used to this pinout, it's very handy to use ^^
-## Firmware
-I only re-host theses files in case the original goes missing. I haven't written those... Download: {{avr:t85:littlewire:littlewire.tar.gz|Micronucleus Bootloader (1.02) and LittleWire Firmware (1.3)}}
-Flash an empty chip with:
-    avrdude -c usbtiny -p t85 -U flash:w:micronucleus-1.02.hex -U lfuse:w:0xe1:m -U hfuse:w:0x5d:m -U efuse:w:0xfe:m
-And then use the Micronucleus software to flash the LittleWire firmware.
-## Result
-{{:avr:t85:littlewire:small_dsc_0235.jpg?direct&200|}} {{:avr:t85:littlewire:small_dsc_0236.jpg?direct&200|}} {{:avr:t85:littlewire:small_dsc_0237.jpg?direct&200|}}