adding pwm sample

1 files changed, 38 insertions, 0 deletions

diff --git a/python/examples/pnPWM/Servo_Example.py b/python/examples/pnPWM/Servo_Example.py
new file mode 100644
index 0000000..c5ca88a
--- /dev/null
+++ b/python/examples/pnPWM/Servo_Example.py
@@ -0,0 +1,38 @@
+#!/usr/bin/python
+
+from Adafruit_PWM_Servo_Driver import PWM
+import time
+
+# ===========================================================================
+# Example Code
+# ===========================================================================
+
+# Initialise the PWM device using the default address
+pwm = PWM(0x40, debug=True)
+# Note if you'd like more debug output you can instead run:
+#pwm = PWM(0x40, debug=True)
+
+servoMin = 150  # Min pulse length out of 4096
+servoMax = 600  # Max pulse length out of 4096
+
+def setServoPulse(channel, pulse):
+  pulseLength = 1000000                   # 1,000,000 us per second
+  pulseLength /= 60                       # 60 Hz
+  print "%d us per period" % pulseLength
+  pulseLength /= 4096                     # 12 bits of resolution
+  print "%d us per bit" % pulseLength
+  pulse *= 1000
+  pulse /= pulseLength
+  pwm.setPWM(channel, 0, pulse)
+
+pwm.setPWMFreq(60)                        # Set frequency to 60 Hz
+while (True):
+    for x in range(0,15) :
+        # Change speed of continuous servo on channel O
+     	pwm.setPWM(x, x, servoMin)
+ 	time.sleep(0.0001)
+  	pwm.setPWM(x, x, servoMax)
+  	time.sleep(0.0001)
+
+
+