Hydrophone: Turn off wifi

[David Sutton]

It has been noticed that turning off the wifi on the pi for the hydrophone significantly reduces the noise present in the audio signal. Since the pi is now an ethernet device, the wifi of the pi should be permanently disabled (or at least turned off for most of operation)

this can be down with the following command:

sudo ifconfig wlan0 down

This will also reduce the power consumption slightly.