Merge pull request #165 from ladyada/master

xylophones are WOOD, this is a METALLOPHONE!!!

Author: ladyada

Crickits/metallobot/code.py

@@ -0,0 +1,70 @@
+# CircuitPython 3.0 CRICKIT demo
+from digitalio import DigitalInOut, Direction, Pull
+from adafruit_seesaw.seesaw import Seesaw
+from adafruit_seesaw.pwmout import PWMOut
+from adafruit_motor import servo, motor
+from busio import I2C
+import board
+import time
+import gc
+
+i2c = I2C(board.SCL, board.SDA)
+ss = Seesaw(i2c)
+
+print("Crickit demo!")
+
+# use the CPX onboard switch to turn on/off (helps calibrate)
+switch = DigitalInOut(board.SLIDE_SWITCH)
+switch.direction = Direction.INPUT
+switch.pull = Pull.UP
+
+#################### 4 Servos
+servos = []
+for ss_pin in (17, 16, 15, 14):
+    pwm = PWMOut(ss, ss_pin)
+    pwm.frequency = 50
+    _servo = servo.Servo(pwm)
+    _servo.angle = 90   # starting angle, middle
+    servos.append(_servo)
+
+#################### 2 DC motors
+motors = []
+for ss_pin in ((22, 23), (18, 19)):
+    pwm0 = PWMOut(ss, ss_pin[0])
+    pwm1 = PWMOut(ss, ss_pin[1])
+    _motor = motor.DCMotor(pwm0, pwm1)
+    motors.append(_motor)
+
+servos[0].angle = 180
+
+while True:
+    if switch.value:
+	# Switch is on, activate MUSIC POWER!
+
+	# motor forward slowly
+	motors[0].throttle = 0.2
+	# mote the head forward slowly, over 0.9 seconds
+	for a in range(180, 90, -1):
+	    servos[0].angle = a
+	    time.sleep(0.01)
+
+	# motor stop
+	motors[0].throttle = 0
+	time.sleep(1)
+
+	# motor backwards slowly
+	motors[0].throttle = -0.2
+	# move the head back slowly too, over 0.9 seconds
+	for a in range(90, 180):
+	    servos[0].angle = a
+	    time.sleep(0.01)
+	# calibration! its a *tiny* bit slower going back so give it a few ms
+	time.sleep(0.007)
+
+	# motor stop
+	motors[0].throttle = 0
+	time.sleep(1)
+    else:
+	# switch is 'off' so dont do anything!
+	pass
+