Dear Community,
i want to control three electric valves for heating purposes.
I would like to use one of these motors:
-http://www.oventrop.de/de/products/hbtd ... 700_de.pdf (unfortunately i couldn't find an english datasheet)
This one coul'd be used with a 3-point-control or with a linear control voltage between 0 - 5 V. I consider the steady option as the better, because i dont want to care about logging the time to know the position of the valve.
What is the easiest way to control 3 Valves like this one above with one RPi?
Or: what is the easiest way to get 3 independent 0-5 or 0-10 V Signals out of the Pi ?`
Or: Do you know any other way to realise a control of up to 3 heating valves with RPi?
My own Solutions so far:
Sol1
-using software pwm and an RC-circuit to get a analogue signal and use this one with a resistor to amplify to up to 5 V or up to 10 V
Sol2
-using an DAC, unfortunately the one from Adafruit (MCP4725) is only single channel, but i need three
-i could use something like DAC6578 of Texas Instruments, but i never worked with it before. Do i need andy additional circuits or stuff?