I have connected an MQ-2 sensor to an Arduino 2560 R3. I want to save as much battery as possible, so I want to activate the sensor when it is time to take the measurements (once every 3 hours) and deactivate it, the rest of the time. When I mean deactivate, I mean that I don't want to be supplied/not consuming current/not the LED switching ON, everything on the sensor to be switched OFF. How can I realize this? Is it feasible??
I was thinking of using 3 relais (one for VCC wire, one for GND wire and one for Analog output wire). Is there any better solution?