17. Application and Implications¶
This week I formulated a definition for my final project, and compiled a Bill Of Materials.
Final project¶
My final project has it’s own page you can read all about it there.
In short. I wanted to design a wearable LED setup for my student band outfit.
Inspiration for this were mostly my own experiments with light-up buttons previously (you’d never guess by the mk3. designation :D). This time around I had 3 major goals:
- Ruggedness
- Modularity
- RGB
My previous experience indicates that the biggest challenge with wearables is designing a flexible, yet durable power and signal transmission system. And we also want to move to RGB. Following key technologies should make this possible:
- Vinyl cut flexible PCBs, for flexible, yet complex and durable power and data transmission
- WS1812b ‘neopixel’ addressable LEDs. Individually controller RGB with just a single transmission line
- 3D printing We can use 3D printing to design and manufacture custom housings for both the LEDs and the controlling electronics.
- Electronics production We will be using a custom designed and programmed controller board to go along with our custom LED PCB.
My breadboard bench test versions are very promising. So the question now is how the final product will hold up to a completely unsuitable environment for electronics…
LED VEST BOM¶
For this week I defined a BOM for the components of my system: This can be found on the final project page, but also here.
For the BOM, I calculated an approximate price for the vest. This was only for discrete electronics components: The used 3D filament, acrylic, substrate etc. price is very difficult to estimate!
Kicad can export BOMs as csv. Despite this, the BOMs required quite a lot of manual editing, and browsing digikey. I made the bom in excel, and used this handy tool to move them to markdown.
Original excel BOM can be found here
Final price amounted to approximately 26€. This is remarkably low. Even if the uncountables added up to double that, I think the value for money is excellent!
| Assembly | Amount | Item | Price/unit | Price total | Link |
|---|---|---|---|---|---|
| LED strip | 8 | WS1812B Neopixel, 5050, SMD | 0,3727 | 2,9816 | https://www.digikey.fi/en/products/detail/adafruit-industries-llc/3094/6058485 |
| 8 | 10uF SMD Capacitor | 0,109 | 0,872 | https://www.digikey.fi/en/products/detail/kemet/C1206C106K4PAC7210/12701324 | |
| 1 | Flexible substrate | 0 | 0 | https://www.digikey.fi/en/products/detail/3m/80610974364/4571237?s=N4IgTCBcDaIMwFsAEB2ADARjXALATjTBRAF0BfIA | |
| 6 | Button upper shell, type 1 | 0 | 0 | https://octofiber.com/2-85mm-pla-bronze-filament-0-75kg.html | |
| 6 | Button lower shell, type 1 | 0 | 0 | https://octofiber.com/2-85mm-pla-bronze-filament-0-75kg.html | |
| 2 | Button upper shell, type 2 | 0 | 0 | https://octofiber.com/2-85mm-pla-bronze-filament-0-75kg.html | |
| 2 | Button lower shell, type 2 | 0 | 0 | https://octofiber.com/2-85mm-pla-bronze-filament-0-75kg.html | |
| 8 | acrylic form cut window | 0 | 0 | https://www.etra.fi/fi/akryylilevy-xt-kirkas-3mm-10540003537 | |
| 2 | 3-pin connector, JST | 0,326 | 0,652 | https://www.digikey.fi/en/products/detail/adafruit-industries-llc/4391/10824267?s=N4IgTCBcDaIFYGcAuACADgCxQZgLRoEsA7EAXQF8g | |
| 1 | 30cm velcro strip, hook side. | 0 | 0 | N/A | |
| 1 | red vinyl, 20cm strip, for masking. | 0 | 0 | N/A | |
| Individual leds | 2 | WS1812B Neopixel, 5050, SMD | 0,3727 | 0,7454 | https://www.digikey.fi/en/products/detail/adafruit-industries-llc/3094/6058485 |
| 2 | Button upper shell, type 3 | 0 | 0 | N/A | |
| 2 | Button lower shell, type 3 | 0 | 0 | N/A | |
| 2 | acrylic form cut window | 0 | 0 | N/A | |
| 4 | 3-pin connector, JST | 0,326 | 1,304 | https://www.digikey.fi/en/products/detail/adafruit-industries-llc/4391/10824267?s=N4IgTCBcDaIFYGcAuACADgCxQZgLRoEsA7EAXQF8g | |
| 2 | 3cm velcro strip, hook side. | N/A | |||
| Controller pcb | 1 | C1 10uF | 0,109 | 0,109 | https://www.digikey.fi/en/products/detail/kemet/C1206C106K4PAC7210/12701324 |
| 1 | C2 100uF | 0,67 | 0,67 | https://www.digikey.fi/en/products/detail/united-chemi-con/APXF6R3ARA151ME40G/5824773 | |
| 1 | J2 Conn_PinHeader_UPDI_2x03_P2.54mm_Vertical_SMD | 0,38 | 0,38 | https://www.digikey.fi/en/products/detail/amphenol-cs-fci/10125394-T0803ALF/7589635 | |
| 1 | J3 Battery holder 3x AAA | 1,68 | 1,68 | https://www.digikey.fi/en/products/detail/keystone-electronics/2479/303824 | |
| 1 | Conn_PinHeader_1x03_P2.54mm_Horizontal_SMD | 0,326 | 0,326 | https://www.digikey.fi/en/products/detail/adafruit-industries-llc/4391/10824267?s=N4IgTCBcDaIFYGcAuACADgCxQZgLRoEsA7EAXQF8g | |
| 1 | SPH0645LM4H I2S MICROPHONE BOARD, | 6,4 | 6,4 | https://www.digikey.fi/en/products/detail/adafruit-industries-llc/3421/6691114?s=N4IgTCBcDaIIYBM4DMBOBXAlgFwASbAGcQBdAXyA | |
| 1 | J5 Conn_PinHeader_1x05_P2.54mm_Vertical_THT_D1mm | 0 | 0 | N/A | |
| 1 | Q1 MOSFET_N-CH_30V_1.7A | 0,38 | 0,38 | https://www.digikey.fi/en/products/detail/nextgen-components/AO3400-5-8A/14288066 | |
| 5 | Resistor 1206 | 0,09 | 0,45 | https://www.digikey.fi/en/products/detail/yageo/AC1206FR-10510RL/14286769 | |
| 2 | R_Potentiometer_Small | 0,91 | 1,82 | https://www.digikey.fi/en/products/detail/bourns-inc/PTV09A-4020F-B102/3781123 | |
| 1 | SW1 BUTTON_B3SN | 0,5 | 0,5 | https://www.digikey.fi/en/products/detail/e-switch/TL1100F160Q/59082 | |
| 1 | SW2 SWITCH_AYZ0102AGRLC | 0,81 | 0,81 | https://www.digikey.fi/en/products/detail/c-k/AYZ0102AGRLC/1640108?s=N4IgTCBcDaIIIE0BaAGAjCscDiAlAMgMIgC6AvkA | |
| 1 | U1 Regulator_Linear_LM3480-3.3V-100mA | 0,69 | 0,69 | https://www.digikey.fi/en/products/detail/texas-instruments/LM3480IM3-3-3-NOPB/270720 | |
| 1 | U2 Microcontroller_ATtiny1614-SSFR | 0,86 | 0,86 | https://www.digikey.fi/en/products/detail/microchip-technology/ATTINY1614-SSFR/7354615 | |
| 1 | 1 Shottky diode | 0,21 | 0,21 | https://www.digikey.fi/en/products/detail/infineon-technologies/BAR8802VH6327XTSA1/2337503 | |
| controller misc. | 3 | AAA batteries | 0,64 | 1,92 | https://www.digikey.fi/en/products/detail/energizer-battery-company/E92VP/14267524 |
| 1 | Lower shell, 3D printed | 0 | 0 | N/A | |
| 1 | Upper shell, 3D printed | 0 | 0 | N/A | |
| 2 | Pot knob, 3D printed | 0 | 0 | N/A | |
| 4 | M3 screw. | 0 | 0 | N/A | |
| 3 | JST 3pin leads | 0,7 | 2,1 | https://www.digikey.fi/en/products/detail/adafruit-industries-llc/4336/10650639 | |
| 3 | Velcro strip, loop side. | 0 | N/A | ||
| Misc. | 1 | Humpsvakar band vest | 0 | 0 | https://humpsvakar.fi/ |
| Total cost | 25,86 | € |
Evaluation, future plans¶
I was extremely happy with how the modular aspect turned out, since this let me complete the project in steps.
Audio input is definitely the next thing I will implement. Hardware already has support, only SW implementation is missing!
As for success criteria. The leds need to do two things
- Work
- Look good
I will be really happy if these criteria are met!!
As for continuation. I started a new page for follow up on further versions of the vest. This is a link