I am planning to build a water quality sensor with ph, temperature, and dissolved oxygen, conductivity. The power consumption looks like it will be very high especially due to the signal isolator, I'm estimating about 250mA. I'm going to place it in a remote area so I need it to be as power-efficient as possible.
I was thinking would this work?
What if I use two Arduino to control the power? The first Arduino will control the power supply to second Arduino, which has the sensor installed, using a timer(RTC) to turn off the power for 30 minutes and on for 30 seconds for it to read the sensor data.
Can this work? What would the circuit look like?
For the isolator, I was thinking to use Tentacle Shield and in the documentation, it says that the isolator itself uses about 150mA plus the sensor circuit. https://www.whiteboxes.ch/docs/tentacle/t1/#/
Thanks for the help.