Driving an IR LED: constant current source or not – Arduino, ESP8266, ESP32 & Raspberry Pi stuff
SparkFun Max Power IR LED Kit - KIT-10732 - SparkFun Electronics
Arduino Tv-b-gone IR led Amp - adafruit industries
Amazon.com: DORHEA 2 Pcs Infrared LED Light Board Module for Raspberry Pi Camera Night Vision, 3W 850 IR High Power Night Vision Infrared Illuminator with Adjustable Resistor for Raspberry Pi Camera : Electronics
What is the output of an IR receiver LED (I mean voltage, current or variable resistance)? - Quora
infrared - Understanding voltage and current of a phototransistor w/ collector resistor - Electrical Engineering Stack Exchange
IR LED without resistor nano - General Electronics - Arduino Forum
Infrared Obstacle Detector for Less Than $1 — Maker Portal
Ohm's law - LED resistor calculation | LEDnique
Activity 1: Build and Test the Object Detectors | LEARN.PARALLAX.COM