@mfalkvidd I need to minimize costs, so is there any way i could measure the time that accurately without purchasing external clock hardware? Or any other accurate way / sensor that can track the proximity of an object?

@mfalkvidd I will need to get around 1 - 2 meter distance at the very least. Can you elaborate on how to measure the round trip? I think it can only send 32 bytes of data per trip, and I also have other data to transmit; so how would sending a large packet work?

I want to use a NRF24L01 module to communicate between to Arduino UNOs, but I also need the signal strength since I want to calculate the distance between them relatively precisely. Is there another module you guys know of that does both data transmission AND exposes accurate access to signal strength?