read an high precision adc like hx711

First approach to tare a scale with multiple calls and median filter.

var SCK = D23,
    DOUT = D24;

scale = require('HX711').connect({
    sck: SCK,
    miso: DOUT,
});


function filterMedian(values) {
    var samples = values.length,
        median;
    var i = Math.floor(samples / 2);
    values.sort(function(a, b) { return a - b; });
    if (samples % 2) { //even
        median = (values[i] + values[i + 1]) / 2;
    } else { // odd
        median = values[i];
    }
    return median;
}

function scaleTare(samples, scale, cb) {
    var values = new Array(samples);
    var tare = function(x) {
        if (!scale.miso.read())
            values[x] = scale.readRaw();
        if (++x === samples) {
            scale.zero = filterMedian(values);
            cb();
        }
    };

    function setIntervalX(samples, delay, cb) {
        var x = 0;
        var id = setInterval(function() {
            cb(x);
            if (++x === samples) {
                clearInterval(id);
            }
        }, delay);
    }
    // 100ms deleay is needed when HX711 is in 10Hz mode to read another value
    // maybe add sps value to options  like sps:10 = 100ms, sps:80 = 12,5ms
    setIntervalX(samples, 100, tare);
}

setTimeout(() => { scaleTare(10, scale, () => { console.log("scale is now tared"); }); }, 1E3);

Any hints and tweaks are welcome.