Hi Guys, forgive me if this is a stupid question but circuit design has never been my strong suite... I am wanting to get a nice setup on a mega to monitor my hydroponics setup, including pH, TDS, temp and maybe DO sensors. That's all well and good, but I need four or more zones, each zone with its own complete set of sensors. So all that said, I would love to get away without having to build 8 opAmp circuits to read the sensors.
My question is this, would it be feasible to front end the amplifier circuits with a set of transistors that I can trigger from digital i/o pins to basically switch the input to the amplifier to whatever probe I want to take a reading on? Am I just dreaming, or could that actually work?
Any advice or comments would be greatly appreciated!