Digital Potentiomter MCP42100 With Arduino

YouTube totorial: https://www.youtube.com/watch?v=ng02DgYYKDI

Digital potentiomter acts in a same way as analog one, except that instead of using fingers to adjust resistance you need to send signal from Arduino via SPI protocol.

In attached screenshots you can see:

Pirice comparinson for other alterantives.
How to use potentiomter with transistor in case if you want to use it for bigger load. For example to adgaste brightnes of LCD backlight.
How to use it as volume control
Arduino scetch
Fritzing wiring file.

Pulldown resistors are 4.7KOhm (can be: 4K-10K.)
LED resistors: 470Ohm