4 ms·

Here's my version of that, via an ESp8266, and MQ: https://github.com/skx/esp8266/tree/master/d1-distance https://github.com/skx/esp8266/tree/master/d1-distanc

Here's my version of that, via an ESp8266, and MQ: https://github.com/skx/esp8266/tree/master/d1-distance https://github.com/skx/esp8266/tree/master/d1-distance