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Description:

LEDs - those blinky things. A must have for power indication, pin status, opto-electronic sensors, and fun blinky displays. This is a pack of basic red, yellow, white and green 5mm LEDs (6 of each) all conveniently packaged in a nice reusable ESD safe bag.

Example

MQTT Basic Example: http://osoyoo.com/2017/05/10/nodemcu-lesson-8-mqtt-basic-example/ Arduino- External LED Blink Tutorial:http://osoyoo.com/2017/05/05/arduino-external-led-blink-tutorial/

Reference

LED wiki: https://en.wikipedia.org/wiki/Light-emitting_diode rohs_icon