Water Depth sensor
From Glacsweb Wiki
The water depth sensor uses two pressure sensors on the custom avr plus amplifier board:
atmospheric MPX4115AP absolute
waterproof P sensor
the AVR reads both - so we need to convert them to pressure and subtract them to get water depth -
if you connect an rs485 converter and run phil's code: python client2.py /dev/ttyUSB0 9600
and get the data with "g id" you see the raw adc values
1 adc is 0.367mm water
adc0 is in water, adc1 is the one in air.
