port soft tone example from WiringPi

examples/softtone.py

@@ -0,0 +1,16 @@
+# Test of the softTone module in wiringPi
+# Plays a scale out on pin 3 - connect pizeo disc to pin 3 & 0v
+import wiringpi
+
+PIN = 3
+
+SCALE = [262, 294, 330, 349, 392, 440, 494, 525]
+
+wiringpi.wiringPiSetup()
+wiringpi.softToneCreate(PIN)
+
+while True:
+    for idx in range(8):
+        print(idx)
+        wiringpi.softToneWrite(PIN, SCALE[idx])
+        wiringpi.delay(500)