python - Raspberry PI - Error accessing 0x40: Check your I2C address -

python - Raspberry PI - Error accessing 0x40: Check your I2C address -

i seek run python servo script on raspberry pi. got code here

https://github.com/adafruit/adafruit-raspberry-pi-python-code/blob/master/adafruit_pwm_servo_driver/servo_example.py

python servo script

#!/usr/bin/python adafruit_pwm_servo_driver import pwm import time # =========================================================================== # illustration code # =========================================================================== # initialise pwm device using default address # bmp = pwm(0x40, debug=true) 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 per sec pulselength /= 60 # 60 hz print "%d per period" % pulselength pulselength /= 4096 # 12 bits of resolution print "%d per bit" % pulselength pulse *= 1000 pulse /= pulselength pwm.setpwm(channel, 0, pulse) pwm.setpwmfreq(60) # set frequency 60 hz while (true): # alter speed of continuous servo on channel o pwm.setpwm(0, 0, servomin) time.sleep(1) pwm.setpwm(0, 0, servomax) time.sleep(1)

i seek solution not helping.

https://learn.adafruit.com/downloads/pdf/adafruit-16-channel-servo-driver-with-raspberry-pi.pdf

please advice.

first of all, don't want logged root everytime: set sudo when need , type password.

second: i2c bus not configured or wiring wrong. the command i2cdetect doesn't see attached. have installed smbus , i2ctools, have removed i2c-bcm2708 blacklist? need type:

sudo nano /etc/modprobe.d/raspi-blacklist.conf

and add together # line i2c-dev , i2c-bcm2708.

from:

blacklist i2c-dev blacklist i2c-bcm2708

to:

#blacklist i2c-dev #blacklist i2c-bcm2708

than need add together modules i2c @ startup

sudo nano /etc/modules

and add together these 2 lines end of file:

i2c-bcm2708 i2c-dev

now can manually load these modules commands

sudo modprobe i2c-bcm2708 sudo modprobe i2c-dev

now type 1 time again :

sudo i2cdetect -y 0 #if have rev1 board sudo i2cdetect -y 1 #if have rev2 board

now, if see dots in chart (like before), check wiring. if see something, that's address of servo driver.

python linux raspberry-pi