# Applications And Implications - Week 17
----

## Assignments

> **Applications And Implications**
>
> **individual assignment**
> 
> - Propose a final project masterpiece that integrates the range of units covered.
> 
> - Your project should incorporate:
> 
>     - 2D and 3D design
>     - Additive and subtractive fabrication processes
>     - Electronics design and production
>     - Embedded microcontroller interfacing and programming
>     - System integration and packaging.
> 
> - Where possible, you should make rather than buy the parts of your project.
> - Projects can be separate or joint, but need to show individual mastery of the skills, and be independently operable.

## Individual Assignment

### Questions

#### What will it do?

1. Modular Midi Keyboard
    - sends midi signal via USB to a connected pc for each key a different note
    - hold note as long as key is pressed
    - have a modular system to extend the octaves
2. Falling notes display (OPTIONAL)
    - shows the notes sequentially for each key that needs to be pressed when in a song to learn, how to play it

#### Who has done what beforehand?

[Implementation with blender and a display/beamer](https://www.youtube.com/watch?v=8OH3lqxHIqw)

[MIDI Visualisation](https://github.com/kosua20/MIDIVisualizer)

[Synthesia Open Source](https://github.com/linthesia/linthesia)

[MIDI Keyboard with Arduino](https://www.reddit.com/r/WeAreTheMusicMakers/comments/fz2mn9/here_you_have_it_a_midi_keyboard_you_can_build/)

#### What will you design?

-   Keys and mechanics
-   Housing for the controller
-   Holder/Housing for the keys
-   PCB for 
    - key presses
    - reading the keys presses
    - modular connectors and USB connection to PC

#### What materials and components will be used?

**Housing and Keys**

-   PLA or PETG for the housing and keys
-   Wood for the cover and connection of the modules
-   Screws to connect modules with wood and PCBs
-   conductive foam

**PCB**

-   attiny for reading the key presses
-   resistors and capacitors
-   XIAO ESP32

#### Where will they come from?

Your preferred vendor or hardware store for the housing materials and for the electrical components e.g.:

[Reichelt](https://www.reichelt.de/)
[Mouser](https://www.mouser.de/)

Or the PCB maybe produced here:

[JLCPCB](https://jlcpcb.com/)

And for fallback:

[Ebay](https://ebay.de)

#### How much will they cost?

See in the final BOM

#### What parts and systems will be made?

-   Keys
-   Housing for Keys and controller
-   Cover for the components
-   PCBs:
    -   Keys
    -   reading the keys
    -   USB-C/MIDI

#### What processes will be used?

-   3D Printing 
    - Keys, Housing for keys and controller
-   Laser Cutting
    - for the cover of the components
-   Milling/Etching (OPTIONAL)
    - PCBs

#### What questions need to be answered?

-   Getting Key presses with conductive foam possible?
-   Communication with attiny via serial working?

#### How will it be evaluated?

1. MIDI Keyboard
    - mechanics feel like commercial ones
    - midi interface works like expected
    - modular and extendable with snap-fits and connectors
2. Falling Notes display
    - upload a midi files which is played and displayed correctly
    - reacts on pressing the keys at the right time

#### What tasks have been completed?

-   3D Modelling of the mechanics
-   tested midi interface
-   tested conductive foam

#### What tasks remain?

-   Design and Produce PCB
-   Test integration
-   Write code so connect attiny and XIAO

#### What has worked? What hasn't?

-   MIDI device worked, but not that responsive -> code needs improvement
-   I2C for communication not easy

#### What questions need to be resolved?

-   I2C communication with the modules needs to be fixed/get working

#### What will happen when?

See [Project Development](../assignments/project_development.md)

#### What have you learned?

-   project planing is complicated
-   at the begin, you underestimate everything
-   cutting down features initially planed is (almost) always done
-   making and especially sticking to a plan is hard

### Bill Of Materials (BOM)


| Item | Quantity | Price | Where to buy |
|------|----------|-------|--------------|
|XIAO ESP32 | 1 | - | [reichelt](https://www.reichelt.de/de/de/shop/suche/xiao%20esp32?GROUPINDEX=0&search=xiao+esp32)|
|Resistors| 2 | - | [reichelt](https://www.reichelt.de/de/de/shop/suche/smd%20wiederstand?GROUPINDEX=0&search=smd+wiederstand)|
|Capacitors| 1?| - | [reichelt](https://www.reichelt.de/de/de/shop/suche/smd%20kondensator?GROUPINDEX=0&search=smd+kondensator)|
|attiny|1?| - | [reichelt](https://www.reichelt.de/de/de/shop/suche/attiny?GROUPINDEX=0&search=attiny)|
|PCBs|-|-|[JLCPCB](https://jlcpcb.com/)|
|USB-C Cable| 1 | - | [reichelt](https://www.reichelt.de/de/de/shop/suche/usb%20c%20kabel?GROUPINDEX=0&search=usb+c+kabel)|
|Conductive Foam| 1 | - | [reichelt](https://www.reichelt.de/de/de/shop/suche/leitender%20schaum?GROUPINDEX=0&search=leitender+schaum)|
|Pin connector| 6 | - | mouser|
|magnets|12|-|[reichelt](https://www.reichelt.de/de/de/shop/produkt/magnet_4mm_staerke_2mm-151644)|
| screws| 16 | - | [reichelt](https://www.reichelt.de/de/de/shop/suche/schrauben?GROUPINDEX=0&search=schrauben)|

:::{note} 
Quantity is for one module
:::