• I'm not sure I've seen anything specific, but I guess you have three options:

    • Have the temperature Puck advertise its temperature, and have the second one occasionally wake up and listen
    • Have the receiver Puck connect and request information from the temperature Puck
    • Have the temperature Puck connect and 'push' data to the receiver Puck

    I think either of those solutions works fine, although the first option might be easier to debug and also is probably more power efficient - especially for the sensor puck that you can't get to.

    As an example of the first idea:

    Sensor:

    setInterval(function() {
      NRF.setAdvertising({
        0x1809 : [Math.round(E.getTemperature())]
      });
    }, 30000);
    

    Receiver:

    var currentTemp = 0;
    function getTemp() {
      NRF.findDevices(function(devices) {
        var found = false;
        for (var i in devices) {
          if (devices[i].name!="Puck.js e782") continue;
          var d = E.toString(devices[i].data);
          // index of 0x1809 in advertised data
          var idx = d.indexOf(String.fromCharCode(0x09,0x18)­);
          if (idx>=0) {
            currentTemp = d.charCodeAt(idx+2);
            found = true;
          }
        }
        if (found)
          digitalPulse(LED2,1,50); // green = good
        else
          digitalPulse(LED1,1,50); // red = bad
      }, 2000 /* receive for 2000ms */);
    }
    
    
    // look once a minute for temperature
    setInterval(getTemp, 60000);
    

    Right now it flashes green for 'got temperature' and red for 'unable to read temperature' - so it doesn't do anything with the temperature value, but it's easy enough to change.

    The receiver won't be super power efficient, as it's listening for 2 seconds every 60 seconds. It should still last quite a while on a battery though.

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Avatar for Gordon @Gordon started