Picking up on a project I started a long time back, I’ve got the initial success for a simple analog multiplexer for use with the ssc-32 servo controller. The ssc-32 only has four analog inputs to use, so I’ve been working on a way to have more. The below is a 74HC4051 multiplexing chip that three control inputs can switch eight analog (or digital) inputs to a single output. Three servo control pins can be used to control the chip, allowing any of the eight chip analog inputs to be output to a single analog input pin on the ssc-32. I need to check the wiring for the second chip (things don’t act correctly when the second chip is installed), but it would allow four control servo control pins to control sixteen analog inputs to a single analog input pin on the ssc-32. Might be useful for analog servo position feedback and foot contact sensors.
this is a really smart idea. 
well done.
what tests have you carried out so far?
Cool idea! Lots have suggested it, but you’re the first to make it, as far as I know. Good luck with it. 8)
Tweeking the ssc-32 voltage reference pin like below, one could multiplex various reference voltages to the reference pin so sensors that have differing voltage output ranges (0-5v, 0-3.3v, 0-2.0v, etc) could get the ~full 8 bit resolution from the ssc-32 when desired. One probably could also switch analog cam video so several cams could input a single video transmitter one at a time.
Just updating this thread with the below info in another post.
Just a followup on the muliplexer, looks like sparkfun carries the CD74HC4067 chip and a breakout board, but the chip isn’t soldered to the board, which one commenter said correctly is a PITA. Mouser carries the 28 pin dip version for the DIY types. Using four digital outputs from the ssc-32, one could select between sixteen inputs to the CD74HC4067 chip to input to a single ssc-32 input.
sparkfun.com/commerce/produc … cts_id=299
sparkfun.com/commerce/produc … ts_id=9056
sparkfun.com/datasheets/IC/CD74HC4067.pdf
mouser.com/Search/Refine.asp … CD74HC4067
hi,
im also working on same module…could u please tell me…which control pins of ssc-32 u r using for select lines of multiplexer…
Just an update from sparkfun concerning the bottom multiplex board. Origionally it had to be soldered on to the board. For only $5 it is a deal!
ever thought of a decade counter to control this? one trigger pin (and maybe a reset pin to make sure you are never losing count) and 4 analog input pins can turn into … 32 analog inputs! though that would take 5 ic’s and a messy board…
Now that look absolutely perfect. Thanks for the heads up on that one, Zoomkat, I’m ordering a few.