What I need now is an inventory of all the interfaces that my potential sensors would require. I took the list from the previous log and put it in a spreadsheet. Then I went through each datasheet and looked at the interfaces.
Here are the results if I were to put in every sensor:
|3 – Dallas one-wire type|
|6 – I2C|
|1 – SPI|
|3 – digital I/o (pulse, data/clk, etc)|
|1 – serial I/0|
|6 – analog (volts or current)|
|1 – AC resistance|
From this I can now do a quick look to see what interfaces I need to augment for the Arduino style inputs. The Arduino A/D system does not have the accuracy or range this project needs so an outboard chip will be required. From the above I can see an 8 input multiplexed IC with an I2C interface would be a good choice. For example I will look further into the $2 TI ADC128D818.