Arduino Demux An analog / digital multiplexer like the CD74HC4067 (mux for short) can help multiply the amount of pins you have, and it is insanely easy to connect to your arduino or other microcontroller The CD74HC4067 is a 16-Channel Analog

3-8译码器 4-2优先编码器 4选1多路选择器-3-8 4-2 priority encoder decoder 4-to-1 multiplexer