Calculate exponential moving average of a temperature sensor and calculate heating curve

iobroker_ema.js

const EMAID = 'javascript.0.variables.Jeisha_AT_EMA'
const Outside_Temp = 'mqtt.0.heishamon.main.Outside_Temp';

// EMA 1 day, one measurement every minute 24*60
const alpha = 2.0/(24*60-1);

function calcExponentialMovingAverage(accumulator, new_value, alpha) {
    const new_avg = (alpha * new_value) + (1.0 - alpha) * accumulator;
    // round 2 decimals
    return Math.round(new_avg * 100)/100;
};

function handleEma(emaid, valueid) {
    // get current ema value
    const ema = getState(emaid).val
    // get new measurement
    const new_value = getState(valueid).val
    // calculate new ema value
    const new_ema = calcExponentialMovingAverage(ema, new_value, alpha);
    // set new ema value
    setState(emaid, new_ema, true);
}

// every minute
schedule("* * * * *", function () {
    handleEma(EMAID, Outside_Temp);
});


// calculate heating curve
const HCID = "javascript.0.variables.Jeisha_VL_CALC";
on({id: EMAID, change: 'any'}, (obj) => {
    const new_hc = -0.33 * obj.state.val + 28;
    const new_hc_r = Math.round(new_hc);
    setState(HCID, new_hc_r, false);
});