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If Arduino does not have enough pins, then you can easily add them! There is a special device - a port extender based on the PCF8574 chip. The expander is connected on the line I2C. PCF8574 increases the number of pins by 8.
Be sure to read these articles:
playground.ard...
adatum.ru/pcf85...
github.com/sky...
Library and sketch: drive.google.c...
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Useful links:
Port extender: ali.pub/1xmmap
Port extender for 16 pins: ali.pub/1xmme7
Display 1602 + expander ports: ali.pub/1vb6ja
Micro SD Module: ali.pub/1tkx36
Arduino Mega 2560: ali.pub/1ny34r
Cheapest Arduino Pro Mini for crafts: ali.pub/1ny2z4
Breadbord: ali.pub/1ny3ae
Lintels: ali.pub/1ny3la
Quality crosspieces: ali.pub/1ny3j5
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