We need 20 analog outputs with adjustable voltage (0-20 volts), frequency (0-150 Hz), as well as adjustable maximum current, and also the ability to measure current, frequency and voltage.
How can this be implemented using PI?
I know there is an analog zero module for Pi, but it will take up all the GPIO pins and give only 8 analog outputs. In addition, it is unclear whether he can do it all.