LED

GPIO

You can read the instructions about Raspberry Pi GPIO here.

BlockPi uses BCM numbering to control GPIO ports.

LED

You can use jumper wires to connect the LED directly to the GPIO ports, or you can use a bread board or an expansion HAT.

I use an IO Expansion HAT from DFRobot.

Connect the LED's longer foot to a GPIO port and the shorter foot to GND。

Blinking LED

or

or

Breathing LED

Traffic lights

You can also use a RGB LED module to do this.