some accelometer tap demo and funcions

Adafruit_CircuitPlayground.h

@@ -77,9 +77,15 @@ class Adafruit_CircuitPlayground {
 
   uint16_t readCap(uint8_t p, uint8_t samples=10);
 
+  // Accelerometer
   float motionX(void);
   float motionY(void);
   float motionZ(void);
+  void setAccelRange(lis3dh_range_t range) { lis.setRange(range); }
+  void setAccelTap(uint8_t c, uint8_t clickthresh) 
+    { lis.setClick(c, clickthresh, 10, 20, 255); }
+  uint8_t getAccelTap(void) { return lis.getClick(); }
+
 
   // neopixels
   void clearPixels(void) { strip.clear(); strip.show(); }

examples/accelTap/accelTap.ino

@@ -0,0 +1,46 @@
+
+#include <Adafruit_CircuitPlayground.h>
+// Adjust this number for the sensitivity of the 'click' force
+// this strongly depend on the range! for 16G, try 5-10
+// for 8G, try 10-20. for 4G try 20-40. for 2G try 40-80
+#define CLICKTHRESHHOLD 120
+
+void setup(void) {
+  while (!Serial);
+
+  Serial.begin(9600);
+  CircuitPlayground.begin();
+
+  CircuitPlayground.setAccelRange(LIS3DH_RANGE_2_G);   // 2, 4, 8 or 16 G!
+
+  // 0 = turn off click detection & interrupt
+  // 1 = single click only interrupt output
+  // 2 = double click only interrupt output, detect single click
+  // Adjust threshhold, higher numbers are less sensitive
+  CircuitPlayground.setAccelTap(1, CLICKTHRESHHOLD);
+
+  // have a procedure called when a tap is detected
+  attachInterrupt(digitalPinToInterrupt(7), tapTime, FALLING);
+}
+
+void tapTime(void) {
+  // do something :)
+   Serial.print("Tap! ");
+   Serial.println(millis()); // the time
+}
+
+void loop() {
+/*
+ // *or* uncomment this for manual polling of tap data
+  uint8_t click = CircuitPlayground.getAccelTap();
+  if (click == 0) return;
+  if (! (click & 0x30)) return;
+  Serial.print("Click detected (0x"); Serial.print(click, HEX); Serial.print("): ");
+  if (click & 0x10) Serial.print(" single click");
+  if (click & 0x20) Serial.print(" double click");
+  Serial.println();
+
+  delay(100);
+  return;
+*/
+}