Good day guys,
Would you have any hint of direction I need to dig in to be able to calculate precisely the distance between my smartphone and a Seeeduino with BLE 5.0 ?
Thank you
Sorry, no. All RF communication depends on the terrain. Free line of sight is the best. Mountains and trees decrease the distance a lot. Radio transmitters, power lines etc might disturb..
And how precise is 'precisely' ?
Have you been able to find any examples of similar projects, this distance measuring thing is a common request ?
There were a lot of attempts to get distance from bluetooth to use for separation warnings in the early months of covid, don't recall anyone ever getting it to work.
Indeed, it is free line of sight.
Idea is to spot more precisely a buoy or a person in the water.
What I can think of is having a device sending its coordinates.
Triangulating could be another way. Two observing stations pointing at the target, distance between then well defined the distance can be calculed using the angles of yey in the stations.
Edit:
If You know the coordinates of the targe using GPS telling Your coordinates the rest is math.
In open water, GPS would be the easiest solution, have the bluetooth transmit the coordinates.
If you wanted to use triangulation, you would need a directional antenna so you could detect the direction of the signal, and either two receiving stations, or a single receiver station with reading from two or more known locations.
Why bluetooth? The range isn't particularly great, looks like Bluetooth 5.0 is usable to 800 feet / 240 meters, although just detecting the transmission with a sensitive RF receiver should work over greater range if the Bluetooth will transmit without a connection.