Haven’t played with a micro in quite some while…
I could, in theory, hook up 20 analog sensors to a Basic Atom Pro w/ a Bot Board II correct?
No I think it’s only 8 analog inputs on the Pro chip.
Alrighty then, looks like I’m going to have to employ the use of some 8 channel A/D converters then.
Depending on how often you need to sample your channels you could instead use a HC4051 Analog MUX hooked to one of the A/D pins of the Atom. This would allow one A/D pin on the AtomPro28 to read upto 8 analog signals. Theoretically you could do this on each of the 8 A/D capable pins of the AtomPro28(AtomPro24 only has 4 A/D pins)to reach a maximum of 64 A/D inputs(32 on the AtomPro24). It would require 3 extra I/Os be hooked to the 4051s switch pins to control which of the 8 inputs was attached to the AtomPros A/D pins at the time you take the A/D reading. The mux is anywhere from 0.50 to 1.50 depending on quantity bought if I remember correctly.
The hc4051 would make a simple choise for multiplexed analog input. I’ll have to get some to try with the ssc-32.
We’ve been using this family of analog MUXs for years now. I’ve found them to be very usefull when I want to switch signals without interfering with their levels.