#173: casual lowpass filter

simple_ema.c

@@ -0,0 +1,13 @@
+#include <stdio.h>
+
+// Exponential Moving Average Lowpass Filter 
+void ema_filter(float current_value, float *previous_ema, float alpha) {
+    *previous_ema = (alpha * current_value) + ((1 - alpha) * (*previous_ema));
+}
+
+int main() {
+    float alpha = 0.1f; // smoothing strength
+    float ema = 0.0f; // initial value can be 0
+    // Something like : ema_filter(curent_unfiltered_value, &ema, alpha)
+    return 0;
+}