Total newbee

Using Arduino Project Guidance
1

Hi am a total noob at this,

recently bought a uno so that learn more about it and eventually want to make a piece of test equipment to test for power on 27 pins of a cable and send that info out to a raspberry pi to turn that into a readable spreadsheet.

So my issue is that there is only 6 analog inputs, How do I get more? need a total of 27 of which one will be a constant ground for the other 26.

Programming and interfacing with the pi I don't think I'll have and issue just the input is my issue.

Any tips will be welcome and the out come will be posted during each steps.

2

The above link gives one idea of how you could do this. Maybe someone mounts three on a shield for you, but this device has some merit. --Rob.

This one has exactly what you need.

http://blueberryde.com/shop/24-channel-analog-expander-shield/

3

You could use multiplexer ICs such as the ADG528AKNZ. Or, you could use ADC (Analog-to-Digital Converter) ICs as rmetzner49 mentioned.

How frequently do you need to sample the wires?

4

I don't think you can do better than $24 for a packaged solution. You will easily have that by the time you use 4x ADG528's and a circuit board.

5

The ADG528 was just the first hit on Google. There's also the Maxim MAX4581CPE+ which is less than $2, and I'm sure there are dozens of other chips to choose from.

6

Possible multiplex solutions:

7

http://www.nxp.com/documents/data_sheet/HEF4067B.pdf

8

ty for the responces I bought a Mux sheild and I beleive that will be what will work Karllson roboits sales it and I beleive Mayhem labs were the developer.