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Created by Neel Bullywon, last modified on 2022-03-20

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Responsible Person(s)

Designer: Neel Bullywon Kevin Song

Principle Objective:

Design custom navigation lights that can be attached to a drone

Requirements:

Surface Mount Non Addressable
Handle up to 5V
TBD

https://docs.google.com/spreadsheets/d/1rQ15cULHvpWA7JbSKxMaMTKfRuIcg4_okoWHp6thIQM/edit?usp=sharing

Goals:

What we need: Voltage Regulator, Non-adressable LED strip, diodes

Finding Components:

Option 1: https://www.digikey.ca/en/products/detail/inspired-led,-llc/12V-MB-CW-12M/5866510?utm_adgroup=LED%20Lighting%20-%20COBs%2C%20Engines%2C%20Modules&utm_source=google&utm_medium=cpc&utm_campaign=Shopping_Product_Optoelectronics&utm_term=&productid=5866510&gclid=Cj0KCQiAybaRBhDtARIsAIEG3klGHjHAsND7ZonsMTr5sUk7mRA5dQNZL0cQsck6gkzRwindBAF8jnMaAhWJEALw_wcB

Product Features:

Size 2835 diodes , 0.33” between each LED 8mm flex, cut points available every 1” (3 LEDs)
Available in custom pre-cut lengths or full 12m reels Class 2 DC plug-in connectors (3.5 x 1.3 mm) or screw terminal end connectors available
Adhesive backing mounts to almost any flat surface
Minimal heat production, no IR or UV output
Dimmable with compatible systems Rated to last up to 100,000 hours CSA C22.2 No. 250.0-08/ANSI/ UL Standard 1598, 8750
To be installed in accordance with NEC, using Class 2 12V DC power supply!

Option 2: https://www.digikey.ca/en/products/detail/inspired-led-llc/12V-SB-RGB-5M/9091794

Product Features:

Color changing 5050 RGB diodes
Custom lengths or 12 meter reels Low profile design (10 mm x 2mm)
Minimal heat production- no IR or UV light
Adhesive mounts to almost any flat surface
European Union CE, RoHS compliant
To be used with compatible 12V 4-conductor RGB products

Non Addressable SMD LED Options:

Voltage Regulator Options:

Diode Options:

Final Choices:

LED Strip
- https://www.digikey.ca/en/products/detail/inspired-led-llc/12V-SB-RGB-5M/9091794
- Features: RGB, Surface Mount, 12V Forward Voltage
LEDS
- https://www.digikey.ca/en/products/detail/adafruit-industries-llc/4492/11569136?utm_adgroup=General&utm_source=google&utm_medium=cpc&utm_campaign=Smart Shopping_Product_Zombie SKUS&utm_term=&productid=11569136&gclid=Cj0KCQiAybaRBhDtARIsAIEG3km2SuIrJsH1AKEORmMeJByITyMUmQ5sjySpcJPjcA6iFdzk3gMyoVwaArjfEALw_wcB
- Features: RGB, Discrete, VDD Range (+3.3V ~ +5.5V)
Voltage Regulator
- https://www.digikey.ca/en/products/detail/texas-instruments/LFC789D25CDR/668536
- Features: VIN (9V ~16V), 2 outputs
Resistors (Note: out of stock)
- https://www.digikey.ca/en/products/detail/yageo/RT0603BRC07500RL/7708292?ColumnSort=0&FV=-8|52&page=1&pageSize=25&pv2085=u900 Ohms&pv3=1131&s=N4IgjCBcoEwAwA4CsVQGMoDMCGAbAzgKYA0IA9lANohJxwAEA8gBYC2%2BIAuqQA4AuUEAFUAdgEs%2BjTAFlC2fAFcAToRABfUgFoI0EBkg4CJclXABmLmo0gYplfjH4%2BZJR1JdSKXTyhhePyBgkKyA&sf=0&sv=0
- Features: 500 Ohm Resistors, Tolerance 0.1%

Calculations:

Resistors:
- Power Supply Voltage Range: 5V
  Forward Voltage: 3.3V
  Desired LED Current: 15mA
  Resistance= (Power Supply V - Forward Voltage)/Desired LED Current
  - R=(5V-3.3V)/(15mA)=113.34 Ohms
  - With 100 Ohm Resistor: I=(5V-3.3V)/100= 17mA Max mA=20mA

Job File (With Screenshots)

PCB (2D):

Top Layer:

Bottom Layer:

PCB (3D):

Gerber File Preview:

Timeline:

March 13 2022, researching components needed for the led strip
March 15 2022, agreed to use option 2, calculated LED resistance and found smd resistors. Finalized part selection for the project, awaiting response from EE Leads.
March 19 2022, had meeting with EE team lead and finalized schematic
March 20 2022, small revisions and generated gerber files for production

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