Please visit the Mayhew Labs website for a user guide, schematic, and Arduino library. Sometimes you’ve got way too many inputs, or outputs… or both. How are you going to get them all connected to your Arduino? The Mux Shield, that’s how. The Mux Shield II from Mayhew Labs is an upgrade on their previous Mux Shield which makes it possible to route up to 48 analog and digital inputs or digital outputs to and from your Arduino board. The Mux Shield II improves on the original by moving all of the I/O pins to the end of the board, thus allowing you to add one big connector and hook up a ribbon wire or similar cable solution. This also gets the pins out of the way so that the Mux Shield can be in the middle of a stack, with a shield on top of it, and you can still get to the I/O pins. The pins are arranged into three rows of sixteen and each row can be individually set as a digital input, a digital output or an analog input from the Arduino sketch! Further increasing the flexibility of the board, Mayhew Labs added solder jumpers to the bottom of the board that allow you to shut off this software control feature and “hard wire” the functionality of each row, freeing up the associated Arduino pins for other shields in the stack. The Mux Shield uses TI 74HC4067 analog multiplexers (mux’s) for input functionality and TI 74HC595 shift registers for output functionality. Don’t worry if that’s jibberish to you, the included Arduino library wraps it up and makes it very easy-to-use.
J**C
You can connect them to 5V or GND if you would like to see them read a set value instead of ...
I soldered the included female headers so I could just plug it on top of my Arduino UNO. I also downloaded all the available documentation from the Mayhew Labs website including the Examples.For my project, I need the Mux as all Analog Inputs so thats the Example I compiled.NOTE: The Arduino Serial Monitor DOES NOT have the 28800 bauds option and that is the value used in the example, so all I had to do was change that value to 9600 which is the default for the Arduino Serial Monitor and it worked. I connected a couple of sensors to the Mux and initially I was getting the correct reading in the used pin and a bunch of random lower readings in the unused ones, initially I thought this was a malfunction so I contacted the Support Log in their website and they replayed within a couple of hours and they were able to explain the problem to me as:Unused analog inputs will float and read arbitrary values, and sometimes read the value of a connected sensor on another channel if nothing is plugged into them. You can connect them to 5V or GND if you would like to see them read a set value instead of floating.So, taking that into consideration and connecting the unused pins to GND, everything worked perfectly.Nice product and even better technical support, good job on that !
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