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arduino - Why use a transistor to drive an LED? - Electrical Engineering  Stack Exchange
arduino - Why use a transistor to drive an LED? - Electrical Engineering Stack Exchange

Best IR LED Circuit - LEDs and Multiplexing - Arduino Forum
Best IR LED Circuit - LEDs and Multiplexing - Arduino Forum

Control LEDs Using IR Remote and Arduino
Control LEDs Using IR Remote and Arduino

Adding LEDs - udamonic.com
Adding LEDs - udamonic.com

IR Emitter LED 940nm 5mm (5-Pack) - ProtoSupplies
IR Emitter LED 940nm 5mm (5-Pack) - ProtoSupplies

Driving an IR LED: constant current source or not – Arduino, ESP8266, ESP32  & Raspberry Pi stuff
Driving an IR LED: constant current source or not – Arduino, ESP8266, ESP32 & Raspberry Pi stuff

How to Connect an IR Photodiode Sensor in a Circuit | Homemade Circuit  Projects
How to Connect an IR Photodiode Sensor in a Circuit | Homemade Circuit Projects

DIY TiVo IR Blaster | IR LED + 1k resistor | Jeff Keyzer | Flickr
DIY TiVo IR Blaster | IR LED + 1k resistor | Jeff Keyzer | Flickr

Infrared Obstacle Detector for Less Than $1 — Maker Portal
Infrared Obstacle Detector for Less Than $1 — Maker Portal

Reflective Infrared IR Optical Sensor with 470 and 10K Resistors : ID 2349  : $1.95 : Adafruit Industries, Unique & fun DIY electronics and kits
Reflective Infrared IR Optical Sensor with 470 and 10K Resistors : ID 2349 : $1.95 : Adafruit Industries, Unique & fun DIY electronics and kits

microcontroller - (Infrared LED Circuit) Can i use this circuit with 3.3v  logic? - Electrical Engineering Stack Exchange
microcontroller - (Infrared LED Circuit) Can i use this circuit with 3.3v logic? - Electrical Engineering Stack Exchange

What is the output of an IR receiver LED (I mean voltage, current or  variable resistance)? - Quora
What is the output of an IR receiver LED (I mean voltage, current or variable resistance)? - Quora

Proximity-Sensing LEDs : 7 Steps (with Pictures) - Instructables
Proximity-Sensing LEDs : 7 Steps (with Pictures) - Instructables

Amazon.com: Adafruit Super-bright 5mm IR LED (25 pack) [ADA388] :  Electronics
Amazon.com: Adafruit Super-bright 5mm IR LED (25 pack) [ADA388] : Electronics

IR-Photo Diode Sensor | forElectronics
IR-Photo Diode Sensor | forElectronics

Extend IR Led Range - Raspberry Pi Forums
Extend IR Led Range - Raspberry Pi Forums

IR Transmitter and Receiver
IR Transmitter and Receiver

Driving an IR LED: constant current source or not – Arduino, ESP8266, ESP32  & Raspberry Pi stuff
Driving an IR LED: constant current source or not – Arduino, ESP8266, ESP32 & Raspberry Pi stuff

infrared - Understanding voltage and current of a phototransistor w/  collector resistor - Electrical Engineering Stack Exchange
infrared - Understanding voltage and current of a phototransistor w/ collector resistor - Electrical Engineering Stack Exchange

5 Pairs Side Looking 940nm IR LED Pair Phototransistor SGPT4045 & LED  SIR4045 | eBay
5 Pairs Side Looking 940nm IR LED Pair Phototransistor SGPT4045 & LED SIR4045 | eBay

Resistors for LED Circuits | Resistor Applications | Resistor Guide
Resistors for LED Circuits | Resistor Applications | Resistor Guide

Ohm's law - LED resistor calculation | LEDnique
Ohm's law - LED resistor calculation | LEDnique

Activity 1: Build and Test the Object Detectors | LEARN.PARALLAX.COM
Activity 1: Build and Test the Object Detectors | LEARN.PARALLAX.COM

IR LED without resistor nano - General Electronics - Arduino Forum
IR LED without resistor nano - General Electronics - Arduino Forum

Arduino Tv-b-gone IR led Amp - adafruit industries
Arduino Tv-b-gone IR led Amp - adafruit industries