DevHeads IoT Integration Server•4w ago

Trying to implement a real-time data processing feature using Edge Computing on the AVR128DA48

Still on my project, I’m trying to implement a real-time data processing feature using Edge Computing on the AVR128DA48. The goal is to perform basic filtering on the sensor data ( removing noise from the vibration sensor). Here’s my simple filtering code:

int16_t filter_data(int16_t raw_data) {
    static int16_t last_data = 0;
    return (last_data + raw_data) / 2;
}

int16_t filter_data(int16_t raw_data) {
    static int16_t last_data = 0;
    return (last_data + raw_data) / 2;
}

I expected the filtered data to be smoother, but I’m still seeing a lot of noise. Is this filtering method too just there(simple) for real-time processing? and how can I implement a more robust filtering algorithm on the AVR128DA48?

2 Replies

Marvee Amasi•4w ago

EMA filter smooths signals by applying a weighting factor to the most recent data point, it will reduce the effect of noise. update your filtering code using an EMA filter:

int16_t filter_data(int16_t raw_data) {
    static int16_t filtered_data = 0;
    float alpha = 0.1;  // Smoothing factor (0 < alpha <= 1, lower values = smoother)

    filtered_data = (int16_t)(alpha * raw_data + (1.0 - alpha) * filtered_data);
    return filtered_data;
}

int16_t filter_data(int16_t raw_data) {
    static int16_t filtered_data = 0;
    float alpha = 0.1;  // Smoothing factor (0 < alpha <= 1, lower values = smoother)

    filtered_data = (int16_t)(alpha * raw_data + (1.0 - alpha) * filtered_data);
    return filtered_data;
}

Marvee Amasi•4w ago

Alpha is the smoothing factor that I used there . The smaller the value, the smoother the output but slower to react to changes. A value between 0.05 and 0.3 is usually a good starting point Filtered data is calculated by weighting the new data raw_data and the previous filtered result

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Trying to implement a real-time data processing feature using Edge Computing on the AVR128DA48