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Revision as of 11:07, 3 April 2015
http://hackteria.org/wiki/QTouchADC_Library_for_Arduino
Contents
Board Design
On GitHub
https://github.com/CocoMake7/ not working at the moment...
Comparison to Makey Makey
Resistive sensing vs. capacitive sensing
NO NEED FOR SECOND ALLIGATOR-CABLE!
By using the QTouch ADC method, the analog pins of the microcontroller can be turned into capacitive sensor, without the need of any external circuitry.
Low-Cost
The Makey Makey kit incldudes, the board, some alligator clips, USB cable and a booklet, cost 49$, or 3'500 IDR. Far too much for many schools in india or worldwide.
We are aiming at Bill of Materials prize of approx 3$ for small scale production (5-25pieces). can be reduced to 1.6 - 2$ for large production series (1000 pieces).
Jugaad
We make it as cheap as possible, including capability for local manufacturing. DIL-package, easy available parts, 1 sided PCB design and protoboard design, fancy PCB for collectors and geeks.
Which AVR microcontroller to use?
ATMEGA 328P
- very widely available, prize starting around 220 - 250 IDR (3$), 3.48 from Mouser goes to 1.82 if you buy 1000.
- The smd chip has 8 ADC channels, but the DIL seems to only have 6 ADC channel on Port C, ADC0 - ADC5
- other extra pins for doing stuff
Download ATMEGA328 datasheet
ATMEGA 32u4, same as leonardo or the makey makye
- only smd package
- High prize, 6.32$ from Mouser
- Hardware USB support!
ATTINY 84
- availability ok, prize starting around 150 IDR (2$), 1.50$ from Mouser, goes to 0.83 if you buy 1000.
- 8 ADC channels
What's the difference beetween attiny84A and attiny84 or Attiny84V (Low Power and expensive?) or Attiny841 (new edition of attiny84 or attiny84A)?
ATTINY 25/45/85
- availability ok, prize starting around 85 IDR (1.20$)
- only 4 ADC channels
Design Concept
Download pdf: File:CocoMake7_concept_Diagram.pdf
Related Projects
HID Keyboard emulation
V-USB virtual USB emulation on ATMEGA
Trinket Pro, ATMEGA 328 with bootloader and HID key libary:
Makey Makey - 49.95$
Makey Makey on Sparkfun - $49.95
- https://www.sparkfun.com/products/11511
- Datasheet, Schematics: Makey Makey Schematics
Make something like the Makey Makey with Arduino Leonardo
Make your own Makey Makey, based on Shrimp (Bareduino)
Scratch - free
Create stories, games, and animations Share with others around the world. A creative learning community with 8,808,476 projects shared. With Scratch, you can program your own interactive stories, games, and animations — and share your creations with others in the online community. Scratch helps young people learn to think creatively, reason systematically, and work collaboratively — essential skills for life in the 21st century. Scratch is a project of the Lifelong Kindergarten Group at the MIT Media Lab. It is provided free of charge.
Questions and Considerations
Vendor ID ?
What about this vendor ID. Does anyma have one?
From Adafruit Trinket Pro:
From V-USB
Prototypes
