There was loads of new developments over the last few weeks. Thanks to the intense coconut research geek-in-residency iyok!

Updates:

Switch to attiny85
bring the BabyGnusbuino back to life!
loads of optimizations
Use velocity as signal, no need for re-calibration and detection of on and off state
filtering if AC noise
got the multiplexed version to work
Loads of new boards

To Do:

A jugaad and low-cost educational platform for digital interactivity, compatible with Makey Makey (TM), using QTouch ADC and Attiny85.

Now on GitHub !!!

Follow all updates on our GitHub

Below are notes of the earlier developments

Prototype using Arduino, QTouch and Coconuts

A jugaad ultra low-cost clone to the Makey Makey, but based on QTouchADC sensing, local manufacturing and coconuts

http://hackteria.org/wiki/QTouchADC_Library_for_Arduino

Board Design

On GitHub

https://github.com/CocoMake7/

Make Your Own CocoMake7

File:CocoMake7 4channel2.jpg

240px

Programming the Attiny84 from the Arduino as ISP

Similar to our prototypes it's very easy to just make one on a protoboard. You need to first program the Attiny84 using ISP-programming.

At the moment we are still using an FTDI or other USB-2-Serial converter to connect it to a laptop. V-USB is coming soon..

ISP Programmable CocoMake7 on protoboard

Only a small number of parts are needed
Solder a IC socket, 14pin for the Attiny84 and a pin-header 6pin for the ISP connection.
Solder the wires from the ISP connection to the chip, diagram will follow...
Almost complete. Added USB plug and the Vcc and GND to it. A 3.5mm mini-jack after the LED
Add components
Cut the board into shape and put it into a coconut

avrdude -P /dev/ttyUSB0 -b 19200 -c avrisp -p t84 -v

Done:

add LED with resistor on pin 5, aka PB2, formely known as pin 8 in the Arduino IDE
solder the USB port, still need to figure out the pin layout...

Using the simple CocoMake7 as PWM-CV or Theremin

V-USB implementation for CocoMake7

Next steps:

connect the USB port D+ and D- to pin 2 and 3, aka PB0 and PB1.
Figure out the V-USB stuff... stahl is working on it!
make some PCB's

KiCad, schematics and PCB design by pin

Eagle PCB design as USB stick by stahl

3d laser cuttable case made in openscad (will add d/l link after quality check is approved hehe)

Issues:

we have to add a crystal oscillator 16MHZ... so 2 pins less :-(
redesigned hardware core and schematics to put the USB on PB07 and PB06

Done:

v-usb MIDI is working, sometimes still issues with timing and the Touch-reading seems to be more noisy?
v-usb KEYBoard, also kinda working, hurray to staaaahhhll!

Other Prototypes of the CocoMake7

CocoMake7-Hackathon

June 20 & 21 we are doing the CocoMake7-Hackathon in Zug... let's see what nice educational and sound/performative elements we can develop!

CoconutResearch Residency at a.n.y.m.a.

13 - 15. December Stahl and dusjagr went to anyma to further develop the CocoMake7...

Things to do:

think deeply about Coconuts...

Example to use with CocoKeys: http://www.patatap.com/

Comparison to Makey Makey

Resistive sensing vs. capacitive sensing

NO NEED FOR SECOND ALLIGATOR-CABLE!

VS.

These schematics compare the resistive sensing from makey makey to the CapSense library (needs a high Ohm resistor, on the digital pins). There is a huge difference in the interactivity if the "user" doesn't need to be hooked up to a wire. everybody can interact, multiple people can play at the same time etc..

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 official kit from Makey Makey

the touchboard by BareConductive

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).

Just a general thought about different interpretations of "low-cost" in the West... in China... and in India?

Let's see what we can make/produce in India...

Makey Makey GO

just now, May 2015, they announced a new product, already heavily hyped online and fastly supported on their kickstarter campaign (please not the address -> Cocoa Beach :-)

This one seems to use CapSense, maybe on an attiny? no open hardware as it seems...

1 single Capacitive butten
detected as keyboard, spacebar press it seems
magnetic to clip on aligators, or put it on the fridge
nice and small
19$, prize is soso... for only 1 button
attached to smart phone via the usb-converter plug

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?

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
adding a 4051 multiplexer, prize?
connection to other projects, like the ATtami

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!

ARM Cortex-M4 -> Teensy 3.1

yeah, it's cheating, not Jugaad, but rich-bitch Swiss stayle. But it works....

Nuvoton or hacked toys

http://www.nuvoton.com/hq/?__locale=en

Raspi? zero

https://learn.adafruit.com/turning-your-raspberry-pi-zero-into-a-usb-gadget?view=all#other-modules

Design Concept

Download pdf: File:CocoMake7_concept_Diagram.pdf

Working prototypes

Attiny84 4 Channel QTouch -> PWM and serial out

Controlling a synth on puredata

Triggering samples on puredata

Attiny84 I2C communication to Mozzi Sound processor

not developed further

CocoMake7 USB-stick - Attiny84

Testing MIDICocoMake7

Download the pd test-MIDICoco patch here: File:test_MIDICocoMake7.pd.zip

Here is a nice webSynth: http://webaudiodemos.appspot.com/midi-synth/index.html

Figure out the most important control values for this. and we can play the keys and the midi simultanoulsy!!

Testing KEYSCocoMake7

CocoMake7 rev 0.0.1

Download schematics: File:cocomakey.pdf

Download KiCad files: File:cocomakey1.zip

USB plug version of CocoMake7 using attiny84

To Do:

add LED on PB2
change silkscreen to Make7
add a reset button?
Redesign the ISP port on backside to have additional standard size

NanoCocoBabyMake7 - Attiny85 and MultiPlexer

Going back to the 85. Why?

Cheaper
much wider availabibility
no crystal needed
because we can

https://oshpark.com/shared_projects/Qk02TStg

Schematics: File:cocobabygnusb1_06a_schematic.pdf

Where to get a good micro-USB to hand-solder:

NanoCocoFetus - Attiny85 pure!

https://oshpark.com/shared_projects/zLk4hSvO

CocoTeens7

Works very fine, but not so much "jugaad". See github.

Nice stand alone sample player easy to be implemented... see more about audio on the Teensy 3.1.

CocoTeens7 - Taipei Edition

Testing the new CocoTeens7 at Dimension+ and Openlab Taipei:

CocoTeens7 - v2 break-out

Download the board: File:Teens7Coco_pcb_dusjagr_MASK.pdf

Logarithmic LUT generator

Check and use on GoogleDocs

Related Projects

HID Keyboard emulation

V-USB virtual USB emulation on ATMEGA

http://www.obdev.at/products/vusb/hidkeys.html

V-USB HID devices on attiny, loads of well written code

http://codeandlife.com/2012/06/18/usb-hid-keyboard-with-v-usb/

Gnusbuino by Michi Egger - anyma

http://wiki.sgmk-ssam.ch/index.php/Gnusbuino

Easy Logger V-USB keyboard on Attiny

Virtual Keyboard (vusb-for-arduino library) for Arduino

Trinket Pro, ATMEGA 328 with bootloader and HID key libary:

https://learn.adafruit.com/pro-trinket-keyboard/library

Turn your Arduino UNO into a HID keyboard

http://wiki.sgmk-ssam.ch/index.php?title=Arduino_Uno_R3_as_HID

Makey Makey - From $49.95 was $69.95

Is it compatible to Coconuts?

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

http://blog.arduino.cc/2013/03/23/how-to-make-makey-makey/

Make your own Makey Makey, based on Shrimp (Bareduino)

http://fromscratched.nl/index.php/shrimpkey-maak-je-eigen-makeymakey-deel-3/?lang=en

Makey Makey GO - 25$ coming soon

Makey Makey GO - coming in Nov 2015

1 single button
1 red aligator clip
some non interactive LEDs for stayle
magnetic clip
direct usb plug on device (like the BabyGnusbuino)
is it reprogrammable to choose the keystroke? function buttons?
instructions.. .following

On Kickstarter since May, delivery until november?

https://www.kickstarter.com/projects/joylabz/makey-makey-go-invent-everywhere-invent-now?ref=card

BareConductive Touchboard - £90.00

the touchboard by BareConductive

Based on ATMEGA 32u8 Leonardo, uses capacitive sensing, conductive paint

http://www.bareconductive.com/shop/touch-board-inventors-kit/

Seems they use an additional chip for the capacitive sensing, MPR121. Prize ca 1-2$ on the real!

http://www.freescale.com/webapp/sps/site/prod_summary.jsp?code=MPR121

At sparkfun a breakout board is available for 9$.

https://www.sparkfun.com/products/9695

Nice they don't do any "open-washing". good engineering and in the end... all the code is here:

https://github.com/BareConductive

ototo.fm - 60£

Based on ATMEGA 32u8 Leonardo

can be detected as USB device

play dircetly some sounds, using the mozzi library

http://www.ototo.fm

https://www.youtube.com/embed/pFRl5bvVOnY

Beetbox

https://vimeo.com/55658574

http://openmaterials.org/beetbox/

MPR

https://learn.adafruit.com/metal-inlay-capacitive-touch-buttons

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.