I did a similar project with two nrf24 and two hc-sr04. Got good (consistently good) distance-btwn-units with a small correction for latency. Timing started on receipt of radio message.
I did a similar project with two nrf24 and two hc-sr04. Got good (consistently good) distance-btwn-units with a small correction for latency. Timing started on receipt of radio message.