Is ADC DAC Pi what i need ?

Hello
I am trying to come up with a slim HMI with "plc", and none of the existing HMI panels with plc are small and or cheep enough.
So i am looking at Raspberry Pi. I need to have Analog out, and digital in/out
Analog out properly need to be 0 - 10v or 0 - 20 mA, standard for the equipment that need to be attached.
Now i am looking at this since Raspberry Pi do not have analog out by default.
https://www.abelectronics.co.uk/products/3/Raspberry-Pi-Model-A-and-B/39/ADC-DAC-Pi-Raspberry-Pi-ADC-and-DAC-expansion-board
This may be an option? could I use this board with something like:
https://www.tindie.com/products/ozzmaker/piscreen-35-tft-with-touch-for-the-raspberry-pi/
or
http://www.adafruit.com/products/1601
I am new to Raspberry Pi, so i do not know what "fall pits" there are or what limitations are.
-Thanks

Hello

I don't think the ADC DAC Pi will work with either of those displays as they both use the SPI port and so does the ADC DAC Pi. You can only have one SPI device connected to the Raspberry Pi so there would be a conflict between the two expansion boards. The analogue out on the ADC DAC Pi also only goes up to 2.048 volts.

Is there any other options you see that i could use ?. the display is a must, just like the analog out is a must.
As for voltage i could make an "amplifyer" or something correct ? or use 2.048 V and add something that makes it 0.20 mA would propearly be the simplest.
Any sugestions would be aprisiated.
-Thanks

You could try finding a DAC chip that uses the I2C bus instead of the SPI bus.

Texas Instruments do several I2C DACs, so it may be worth trying to find one that fits your needs and order some free samples to play with.

As the I2C port on the Raspberry Pi is 3.3 volts you may need to use a level shifter if you choose a DAC that works at a higher voltage.

Could it be something like this?
http://www.adafruit.com/products/935
and something like this for input ? or is there only one I2C also ?
https://www.adafruit.com/products/1085

Those two should work together and they are both 3.3V compatible so you can control them directly from the Raspberry Pi I2C interface.

Thanks for your support!!!