LarrylLix said:Trouble is, how many peripheral boards do we need to add to connect to the real world to make a the credit card size board work safely?
Trouble is really, there's no "one size fits all" solution.
Everyone wants to do something slightly different. Opto-isolated inputs are ideal for some, but completely unused for others and do nothing but add to costs.
The WC32 daughter-board has opto-isolators for each input channel.
It also has adjustable-gain amplifiers for each analog input.
It also has open-drain fet drivers for a few (4) outputs.
That board is getting fairly busy though, and its cost is somewhat higher than it needs to be if you don't want or need isolation, or the FET outputs, or the amplifiers!
I'm trying to get a little spare time to make another version of my WC8 terminal board which will include some optos etc, but it will be a while off yet.