Measuring distance between two devices using puck.js

Hi friends,

I am working on some project in which we have to measure the distance between two nearby device using puck.js . if distance is less then a meter . we need to emit LED.

One device is puck.js and other one is ESP32.
Help me to figure out this.

Assuming the ESP32 is advertising, you should be able to use something like:

NRF.setScan(function(d) {
  if (d.addr=="...") LED.write(d.rssi>-70);
});

You'll need to change the address and probably the RSSI value as well, but that should be a good start :)

Thanks its working

Just a quick note that doing this does use a lot of power (as the radio is always receiving) so will run the battery down quite quickly - so you might want a way of only enabling it when you need it.

Hello, I am trying to do something similar but I have two puck.js how would this programming change? I am actually trying to get the signal and turn it into a distance, or just display the strength to eventually turn it into a distance?

The code should be exactly the same... You can just use setScan/requestDevice/etc and look at the rssi value in what's returned.

Or, if you've got an active connection between the two devices you can use setRSSIHandler (https://www.espruino.com/Reference#l_BluetoothRemoteGATTServer_setRSSIHandler) - with the active connection it is a lot more power efficient than constantly scanning for advertisments.