Let's discuss an example where we make use of the Raspberry Pi Zero's GPIO. We will interface an LED to the Raspberry Pi Zero and make it blink on and off with a 1-second interval.
Let's wire up the Raspberry Pi zero to get started:
Blinky schematic generated using Fritzing
In the preceding schematic, the GPIO pin 2 is connected to the anode (the longest leg) of the LED. The cathode of the LED is connected to the ground pin of the Raspberry Pi Zero. A 330 Ohm current limiting resistor is also used to limit the flow of the current.
Breadboard connections to the Raspberry Pi Zero