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.
MQTT Basic Example: https://osoyoo.com/2017/05/10/nodemcu-lesson-8-mqtt-basic-example/
External LED Blink Tutorial:https://osoyoo.com/2017/05/05/external-led-blink-tutorial/
LED wiki: https://en.wikipedia.org/wiki/Light-emitting_diode
DownLoad Url osoyoo.com