sdr sweeper

example.js

var rtlsdr = require('rtlsdr'); // require the module

var freq = 91495300 // local NPR fm (91.49mhz)
freq = 45495300     // random freq in Hz  45,495,300hz

rtlsdr.getDevices(function (err, devices) {
  
  devices[0].open(function (err, device) {
    
    device.setSampleRate(2048000);
    device.setCenterFrequency(freq);
    
    device.on("data", function (data) {

      var diff = 0
      for(var i = 0; i < data.length; i++){
        diff += Math.abs(data.readUInt8(i) - 127)
      }

      var b = []

      for(var i = 0; i < 32; i++){
        b.push(data.readUInt8(i))
      }
      // output the average, the array, and the frequency on the same line
      console.log((diff/data.length).toFixed(14), b.join(' '),freq)

      // change frequency
      freq+=100000
      device.setCenterFrequency(freq)

    });
    device.start();
  });
});