3.3v leds (with built-in resistor) - SERP Analysis

https://electronics.stackexchange.com/questions/373148/resistor-requirement-for-3-3-v-supply

https://www.mouser.com/c/optoelectronics/led-lighting/led-emitters/standard-leds-smd/?vf%20-%20forward%20voltage=3.3%20V&srsltid=AfmBOoqkupCaYIIUciA40agWVQQVBXREmlSTgupYPFgP6yYbfublHqyw

https://learn.sparkfun.com/tutorials/light-emitting-diodes-leds/all

https://forum.arduino.cc/t/common-led-resistor-leds-on-arduino-at-3-3v/197562

https://www.quora.com/What-resistor-do-I-need-for-a-3-3-V-LED

https://www.railwayscenics.com/round-yellow-flickering-water-clear-resistor-required-p-2166.html

https://www.reddit.com/r/esp32/comments/1ciucn2/do_led_really_need_resistor/

https://picaxeforum.co.uk/threads/led-with-built-in-resistor.27004/

https://www.eevblog.com/forum/beginners/are-small-smd-leds-with-integrated-resistors-a-thing/

https://forums.raspberrypi.com/viewtopic.php?t=104034

https://forum.arduino.cc/t/led-with-3-3v-vf-supply-is-3-3v/853322

https://www.instructables.com/Choosing-The-Resistor-To-Use-With-LEDs/

https://forum.allaboutcircuits.com/threads/why-3v-led-still-requires-resistor-when-input-voltage-is-also-3v.165368/

https://www.evilmadscientist.com/2012/resistors-for-leds/

https://raspberrypi.stackexchange.com/questions/98051/power-led-from-3-3v-power-pin-without-resistor

https://forum.pjrc.com/index.php?threads/teensy-4-0-and-leds.70680/

https://www.youtube.com/watch?v=5nP-9mGr9zQ

https://stardot.org.uk/forums/viewtopic.php?t=25162

https://makecode.adafruit.com/learnsystem/pins-tutorial/devices/led-connections

https://e2e.ti.com/support/microcontrollers/c2000-microcontrollers-group/c2000/f/c2000-microcontrollers-forum/1392283/tms320f28388d-led-limitation-resistor-buffer---evb-example

https://community.particle.io/t/what-resistor-to-use-for-the-led-in-this-switch/48756

https://groups.google.com/g/sci.electronics.design/c/VMEMo0NymEI

https://www.anypcba.com/blogs/electronic-component-knowledge/choosing-the-right-led-resistor-for-12v-a-comprehensive-guide.html

https://learn.sparkfun.com/tutorials/light-emitting-diodes-leds/types-of-leds

https://os.mbed.com/users/4180_1/notebook/rgb-leds/

https://www.tinkercad.com/things/bDHquWl5k2q-lesson-1-blinking-led

https://forums.adafruit.com/viewtopic.php?p=883925

https://www.youtube.com/watch?v=iWusJ_HbWkA

https://forum.kicad.info/t/tried-controlling-an-rgb-led-with-one-transistor-and-failed/37336/23

https://www.electro-tech-online.com/threads/controlling-a-led-from-lower-voltage-signal.165692/

https://projects.raspberrypi.org/en/projects/introduction-to-the-pico/7

https://hackaday.com/2017/01/20/cheating-at-5v-ws2812-control-to-use-a-3-3v-data-line/

https://www.chegg.com/homework-help/questions-and-answers/section-b-led-circuits--circuit-right-made-battery-33v-red-led-vf-16v-resistor-r1-1k-serie-q109742269

https://docs.freenove.com/projects/fnk0072/en/latest/fnk0072/codes/tutorial/3_LED.html

https://makeabilitylab.github.io/physcomp/arduino/led-on.html

https://forum.allaboutcircuits.com/threads/what-resistance-do-i-need-when-powering-a-3v-led-with-a-3v-battery.182684/

https://www.eelectronicparts.com/products/5pcs-rgb-led-breakout-module-5050-3-3-v-5-v-4-dupont-wires-for-arduino?srsltid=AfmBOopeKXTf-GH-5N7dJ4-0iO3jwwo-N5w6EHi3iHKj0QHdwT7m-f_H

https://www.diystompboxes.com/smfforum/index.php?topic=94873.0

https://developer.wildernesslabs.co/Hardware/Tutorials/Electronics/Part6/LED_Lab/

https://github.com/arendst/Tasmota/issues/2066

https://community.particle.io/t/sparkcore-npn-transistor-to-switch-12v-led-strip-3-4-brightness/1211

https://www.edaboard.com/threads/driving-140x-3w-leds.386279/

https://northcoastsynthesis.com/news/driving-leds-digitally/

https://forum.v1e.com/t/skr-pro-1-2-3-3v-led-not-lit-is-this-repairable-or-am-i-buying-new-parts/44436

https://www.eevblog.com/forum/beginners/reducing-3-3v-down-to-2-8v/

https://forums.thecustomsabershop.com/archive/index.php/t-16286.html

https://www.circuitlab.com/questions/78ut992t/tri-color-rgb-led-share-1-resistor-or-use-3/

https://community.home-assistant.io/t/driving-an-led-directly-on-a-gpio/468444

https://www.reefcentral.com/forums/showthread.php?t=2496815

https://linustechtips.com/topic/542622-how-can-i-measure-the-forward-voltage-of-leds/

https://forum.sunfounder.com/t/1-1-1-blinking-led-raspberry-pi-5/1698

https://www.facebook.com/groups/148293525768435/posts/rgb-led-connection-with-arduino-uno-using-220-ohm-resistor/1645071162757323/

https://retropie.org.uk/forum/topic/16309/help-with-led

https://kitronik.co.uk/blogs/resources/which-resistor-should-i-use-with-my-led?srsltid=AfmBOoothVURmn5gnyzUTUHycUPRTU0aY5TJyIK0kUQ_jgkdd6alDjHa

http://razzpisampler.oreilly.com/ch03.html

https://g741.org/PHPBB/viewtopic.php?t=467&start=30

https://www.henryleach.com/2013/05/controlling-rgb-led-with-raspberry-pi.html

https://forum.pjrc.com/index.php?threads/teensy-and-leds.60917/

https://www.tamiyaclub.com/forum/index.php?/topic/40336-help-needed-with-led-lights/

https://learn.pimoroni.com/article/lighting-an-led-170pt

https://www.diystompboxes.com/smfforum/index.php?topic=98464.0

https://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/1208335/3v-led-driver-with-3-3v-power-supply

https://doityourselfchristmas.com/forum/index.php?threads/led-resistor-question.11767/

https://en.wikipedia.org/wiki/LED_circuit

https://siminnovations.com/wiki/index.php/Connecting_a_LED_to_the_Raspberry_Pi

http://www.starshipmodeler.net/talk/viewtopic.php?t=123824

https://www.overclock.net/threads/how-can-i-wire-leds-without-resistors-solved.625656/

https://forum.electromage.com/t/wiring-a-pushbutton-with-3v-led-to-the-pb/1929

https://www.pistonheads.com/gassing/topic.asp?h=0&f=141&t=606980

http://media.opencurriculum.org/resources/1.3_Power_LED_through_button.pdf

https://forum.trains.com/t/can-two-leds-share-a-resistor/326679

https://m.youtube.com/watch?v=nAJUYHy7kO4&t=10s

https://www.edaboard.com/threads/sinking-5v-powered-leds-from-3v-mcu.319395/

https://www.aliexpress.com/w/wholesale-3.3v-led.html

https://diotlabs.daraghbyrne.me/docs/a-simple-internet-appliance/leds/

https://www.electro-tech-online.com/threads/advice-on-powering-a-led-using-a-cr2032-battery.161503/

https://www.instructables.com/Blink-an-LED-With-Arduino-in-Tinkercad/

https://www.vinylengine.com/turntable_forum/viewtopic.php?t=87294

https://www.quora.com/Why-do-LED-diodes-need-resistors?top_ans=319625082

https://www.circuitlab.com/questions/q8rtp9x4/resistor-getting-too-hot-leds/

https://www.homemade-circuits.com/how-to-calculate-and-connect-leds-in/

https://maker.pro/forums/threads/3v-step-down-from-12v.300245/

https://www.reefcentral.com/forums/showthread.php?t=2554802

https://www.overclockers.com/forums/threads/3-3v-to-3v.432856/

https://electricfiredesign.com/2021/03/12/logic-level-shifters-for-driving-led-strips/

https://www.youtube.com/watch?v=gg_yxkr7GnA

https://toshiba.semicon-storage.com/info/RD241B-DGUIDE-01_E.pdf?did=158580

https://www.espressif.com/sites/default/files/documentation/esp32_datasheet_en.pdf

https://randomnerdtutorials.com/esp8266-pinout-reference-gpios/

https://www.amazon.com/Illuminated-Multicolor-littleBits-Electronics-Industrial/dp/B0DLH9RZ13

https://www.youtube.com/watch?v=Jmjq4oqvJ_M

https://protosupplies.com/determining-led-resistor-values/

https://il.ebay.com/b/Led-5mm-Resistor/181880/bn_7023294851

https://www.digikey.com/en/resources/conversion-calculators/conversion-calculator-led-series-resistor

https://lastminuteengineers.com/esp32-pinout-reference/

https://www.espressif.com/sites/default/files/documentation/esp32-wroom-32_datasheet_en.pdf

https://helvarcomponents.imagebank.fi/api/v3/file/581b9af563f57314/serve?download=1

https://www.optosupply.com/newproduct/

https://forums.tomshardware.com/threads/12v-to-power-3v-leds.3647759/