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Adafruit 16-Channel Servo Driver error

by nonlinearmind on Thu Dec 20, 2012 4:02 pm

I'm trying to get a Servo motor running using the tutorial. I've followed all the steps and have successfully run sudo i2cdetect -y 1
, but when I try to run the servo example, I get this error.

pi@raspberrypi ~/Adafruit-Raspberry-Pi-Python-Code/Adafruit_PWM_Servo_Driver $ sudo python Servo_Example.py
Traceback (most recent call last):
File "Servo_Example.py", line 12, in <module>
pwm = PWM(0x40, debug=True)
File "/home/pi/Adafruit-Raspberry-Pi-Python-Code/Adafruit_PWM_Servo_Driver/Adafruit_PWM_Servo_Driver.py", line 30, in __init__
self.i2c = Adafruit_I2C(address, bus=smbus.SMBus(1))
NameError: global name 'smbus' is not defined
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Re: Adafruit 16-Channel Servo Driver error

by adafruit_support_bill on Thu Dec 20, 2012 5:06 pm

Have you installed the smbus library?

Before you start, you'll need to have the python smbus library installed, run apt-get install python-smbus

http://learn.adafruit.com/adafruit-16-c ... it-library
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Re: Adafruit 16-Channel Servo Driver error

by nonlinearmind on Thu Dec 20, 2012 6:14 pm

Yes, I've installed it and change the smbus line in Adafruit_PWM_Servo_Driver.py to

self.i2c = Adafruit_I2C(address, bus=smbus.SMBus(1))

I've also run sudo i2cdetect -y 1 and gotten the same result as in the tutorial.
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Re: Adafruit 16-Channel Servo Driver error

by adafruit_support_bill on Fri Dec 21, 2012 6:11 am

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