added arduino, modified build

arduino/libraries/Adafruit_Circuit_Playground/examples/accelTap/accelTap.ino

@@ -0,0 +1,48 @@
+#include <Adafruit_CircuitPlayground.h>
+#include <Wire.h>
+#include <SPI.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(CPLAY_LIS3DH_INTERRUPT), 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;
+*/
+}