Tag Archives: Analog Multiplexer



In some cases you will have a MCU with only one analog pin (A0). For example in my case I have the Wemose D1 mini with only one analog pin (A0) however I would like to increase these pins with the MC14051B Analog Multiplexer/Demultiplexer. This is a cheap easy fix but the downside is that it requires an additional chip (the MC14051B ).

MC14051B pin out.

The MC14051B analog multiplexer is a digitally–controlled analog switch. The MC14051B effectively implements an SP8T solid state switch, the device feature low ON impedance and very low OFF leakage current. Control of analog signals up to the complete supply voltage range can be achieved.

I created a small breakout board to make testing and experimenting a little easier.

Template outline.
Effective soldering and trace separation.
Finished product.

More information about increasing analog pins can be found here.