The project must be able to detect the amount of water in tanks and transmit the information to a farm house it must be wireless and unfortunately there is no cell phone reception in the places that need to be monitored.
I have a way of measuring the water that is pretty easy, going to use ultrasonic distance measuring and some maths unless anyone else knows something better?
My problem is to transmit around a max distance of 400 km and must be done with as little power and setup as possible. Going to be using solar panels and will research that later but for now its getting the comms down.
Does anyone have suggestions for the equipment to use for this project? I have looked into a few applications but most require big antennas that need to be setup. The transmission rate is not a problem as it can be as slow as needed really because of minimal data to be sent.
The line of sight is not too great as I'm told but not horrible either.
I would like to use Arduino as I am familiar with it. Repeaters are an option, but would increase the cost a fair amount.
I am willing to get a HAM license but would prefer not to as I'm not really going to use this for "talking" just sending data once every day or so.
Any suggestions and pointers would be of great help.