Assignment 17: Applications and Implications

Final project:

what will it do?
My final project is an  automatic Kantele, sort of. It plays a simple song automatically by plucking the strings with a pick, the movement of which is controlled with two servos by a microcontroller.

I made a Google search after finishing my own design, so that I would not be too influenced by the previous art. There is even an association for automatic instruments enthusiasts. Automatic guitars have been made, for example this made in MIT.

who's done what beforehand?
The mechanical components of the instrument will built from the scratch. I am going to use recycled classical guitar strings. The servos are controlled with the microcontroller board made for week 13 output devices.
 
what materials and components will be required?
- 4 mm birch plywood for the body, bridge and saddle of the Kantele
- Titebond Original glue
- recycled classical guitar strings
- 3D-printed mechanics for tuners and servos
- 2 servos
- guitar pick
- 7.2 - 7.4 V battery
- microcontroller board from week 13

where will they come from?
- plywood from Laatuvaneri or Stark
- Titebond Original glue from SP-elektroniikka
- recycled classical guitar strings from my own supplies
- 3D-printed components from Fab Lab
- servos from HobbyKing
- guitar pick from my own supplies
- 7.2 - 7.4 V battery, recycled from my own supplies
- microcontroller board from week 13, Fab Lab

how much will it cost?
- 0.15 m2 birch plywood, 12 €/m² = 1,8 €
- Titebond Original glue < 1 €
- recycled classical guitar strings 0 €
- 3D printed parts 100 cm3 PLA ~ 3 €
- HobbyKing servo HK939MG 5 € * 2 = 10 €
- recycled 7.2 - 7.4 V battery 0 €
- microcontroller board:
    - ATtiny44A 1.3 €
    - 20 MHz resonator 0.53 €
    - 5 V regulator 0,92 € €€
    - 51 * 51 mm PCB 1,3 € (127.0mm x 76.2mm 4,93 €)
    - resistors, capacitors, connectors 1 €
    - total ~ 20 €

what parts and systems will be made?
- Kantele body, tuners, bridge, saddle
- servo mechanics
- PCB

what processes will be used?
- laser cutting
- 3D-printing
- electronics design including schematic and layout design
- PCB milling
- surface mount component placement and reflow soldering
- micro controller programming in C language in Atmel Studio environment

what tasks need to be completed?
- 3D design for servo mechanics

what questions need to be answered?
- the exact mechanics of the tuner and servo is still to be designed and manufactured

what is the schedule?
- week 22: Kantele body, tuners, bridge, saddle
- week 23: 3D-design and printing of servo mechanics
- week 24: assembly and testing

how will it be evaluated?
- I'll make it play a song and listen if it sounds right


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