Run servoblaster Python code

Question

lately i installed servoblaster to my raspberry pi and then tried a simple python code `

import os
import time
os.system('sudo ./servod')
while True:
 os.system("echo 1=100 > /dev/servoblaster")
 time.sleep(0.5)
 os.system("echo 1=1 > /dev/servoblaster")
 time.sleep(2)

i put the code in the directory of servoblaster /home/pi/PiBits/ServoBlaster/user/file1.py but when run sudo python file1.py this what i got

pi@raspberrypi:~/PiBits/ServoBlaster/user $ sudo python file1.py
Board model: 2
GPIO configuration: P1 (40 pins)
Using hardware: PWM
Using DMA channel: 14
Idle timeout: Disabled
Number of servos: 8
Servo cycle time: 20000us
Pulse increment step size: 10us
Minimum width value: 50 (500us)
Maximum width value: 250 (2500us)
Output levels: Normal
Using P1 pins: 7,11,12,13,15,16,18,22
Servo mapping:
 0 on P1-7 GPIO-4
 1 on P1-11 GPIO-17
 2 on P1-12 GPIO-18
 3 on P1-13 GPIO-27
 4 on P1-15 GPIO-22
 5 on P1-16 GPIO-23
 6 on P1-18 GPIO-24
 7 on P1-22 GPIO-25
Invalid width specified
Invalid width specified
Invalid width specified
Invalid width specified
Invalid width specified
Invalid width specified
Invalid width specified

Can you please tell me what's wrong.

Answer 1

Invalid width specified

See https://github.com/richardghirst/PiBits/tree/master/ServoBlaster

Generally a servo will expect pulse widths in the range 1000 to 2000 microseconds although some will go between 500 to 2500.

os.system("echo 1=100 > /dev/servoblaster")

sets 1000μs which should be okay.

os.system("echo 1=1 > /dev/servoblaster")

sets 10μs which will be invalid.