I like Rando's display. I am working on water level ideas. Any suggestions would be great. I am looking at pressure sensors like the MS5837. It can be used in water.
I am using a Raspberry Pi in my Hawk. It monitors inside, outside, refrigerator and freezer temperatures. I put a temperature sensor on the 3-way fridge radiator and turn computer fans on when the temperature gets above a specified temperature. I monitor the temperature of the hot water heater. I like to turn it off when it gets just above 100 degrees if I am going to wash my hair. The computer also monitors if the gas is on in the fridge and hot water heater. I can track a little of my gas consumption this way but have not come up with a good way to know when the stove is on. Oh well.
I track the truck and camper batteries as well. I also added a GPS and have the GPS antenna up by the fan. GPS data is gathered when the truck is in motion. I have a nice track of my travels, if everything keeps running.
I added a 3-axis accelerometer to level the camper but the good ole bubble levels on the dash can't be beat.
The computer takes samples about once every two minutes and stores all the data in a file. The Raspberry Pi has a web server running which graphs the data or just displays the latest values on my phone or tablet.
I did this project about 4 years back and lately decided to play with it more. Next, I would like to monitor solar data and, as I mentioned above, my water.
Steve