Led Resistor Wiring Diagram. Transistor base draws only a few milliamperes current for activation. The value of the resistor depends on the color led you are using.
Connect three wires to the board. The above image shows a simple circuit to dim an led. Basic led strip light wiring diagram.
The resistor r1 controls the amount of current going through the led.
The connections for the character lcd display are shown in the wiring diagram below. The negative lead of the led the short lead gets connected to gnd via a resistor and the positive lead to digital pin 2. If using a flora feather or other microcontroller board with an attached lithium polymer battery. Momentary button or switch.