How to use the 2N2222 Transistor (NPN) (with examples) - DIY Engineers
transistors - GPIO failing to drive 2N2222 & LED simultaneously - Electrical Engineering Stack Exchange
How to use the 2N2222 Transistor (NPN) (with examples) - DIY Engineers
Driving IR led from 3.3V GPIO using 2N2222 transistor - Electrical Engineering Stack Exchange
How to drive a 10 Watt LED from an Arduino? - Electrical Engineering Stack Exchange
arduino - How many 2N2222 transistors required for 3x3 LED matrix to mutiplex - Electrical Engineering Stack Exchange
transistors - Attempt to use 2n2222 as a switch, but it seems to work below 5v (all the way down to < 1v). Why? - Electrical Engineering Stack Exchange