What do we need to build the controller?
If we want to log data, we will need the SD module card + SD card.
These buttons are not necessary, and needed only in case if we want to manage by using keystrokes instead of the encoder. In this case, we will need 4 buttons and 4 10K resistor.
In fact, you may use any buttons that you have in your house - stick to the old consoles, remote control toys, and so on...
Our controller may be powered by DC 5-12V. Current 1-2A desirable. In some cases, we may need another power supply to 5V. Explanations about this are described below in the 'The relay unit 1 or 4 outputs' paragraph.
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