Adding example sketch for the newly merged filtering feature.

Author: finnkuusisto

examples/plot_filtered_emg/plot_filtered_emg.ino

@@ -0,0 +1,31 @@
+#include <Libdevlpr.h>
+
+// create a DEVLPR object with the pin we have connected on the shield
+// can create multiple for different pins if stacking shields
+// create this one configured for a 60Hz notch filter (50Hz also available)
+Devlpr devlpr(A0, FILTER_60HZ);
+
+void printEMG(Devlpr *d) {
+    // grab the most recent EMG values, filtered and raw
+    int filtered = d->lastValueCentered(true);
+    int raw = d->lastValueCentered(false);
+    // we will print four values each time: -1024, 1024, filtered, and raw EMG
+    // the -1024 and 1024 simply give us a top and bottom line in the plotter
+    Serial.print("-1024 1024 ");
+    Serial.println(filtered);
+    Serial.print(" ");
+    Serial.println(raw);
+}
+
+void setup() {
+    // prepare Serial for printing to the plotter
+    Serial.begin(2000000);
+    // add a printing function as a scheduled callback for our Devlpr
+    // here we set the function to be called every 1ms
+    devlpr.scheduleFunction(printEMG, 1);
+}
+
+void loop() {
+    // let the DEVLPR library do its job
+    devlpr.tick();
+}