Until now we only used the Arduino as power source. Now it is time to program something, right?
Parts
![](https://starthardware.org/en/wp-content/uploads/2019/10/arduino-circuit-led-blink-parts.gif)
Circuit
Build the following circuit. (You can reassemble the one of Unit 4).
![](https://starthardware.org/en/wp-content/uploads/2019/10/arduino-circuit-led-blink-1024x800.gif)
Like in the example before the one side of the circuit is connected to the GND (to the minus pole). But this time the other side is connected to a Digital I/O pin. I/O means input / output. To make things easier, we will call this pins just Digital Pins.
In the next step, we will make it blink!! 🙂
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