FainWan 5Pcs 16CH Analog Digital Multiplexer Breakout Board Module CD74HC4067 CMOS Precise Module Compatible with Ar-duino

I will assume you already know what the CD74HC4067 does, and the seller has a good description. What is great is that it can multiplex both digital and analog signals. Internally, it just switches the common output over 16 possibilities and links it to the signal output, via a low resistance line inside the chip. Note, the resistance of this line is low, but not zero. According to the TI datasheet, the typical resistance is around 60-70 ohms, depending on Vcc level (4.5-6V). That is probably the most important piece of info you need to decide if these will work for you.These boards all come with a little extra strip of circuit board that can be removed (see pictures). I think it's just left over from the manufacturing process, and didn't get broken off at the factory.I didn’t exhaustively test every board (and I didn’t want to solder them yet just for this test), but did spot check one board, and verified I could indeed pass analog signals (via a potentiometer) though to and Arduino, which I read with the onboard ADC. It worked exactly as expected.Overall, these are great little multiplexers, and they get 5 stars!

A downside to many microprocessors is the limit of pins and a similar downside to many sensors as you can only collect data infrequently. These then are a vital addition to many sensor set ups, expanding the pinout while not sacrificing lost samples.The most important thing to know is to look up manufacturer specifications to get the timing right.But all in all, these are in essential in between stretching the capacity of limited micro controllers.Recommended for scalability.