Interger argument

[Dentonknifeworks]

Traceback (most recent call last):
File "/home/pi/tilt.py", line 41, in
bus.write_word_data(addr, 0x08, pan_setting)
TypeError: integer argument expected, got float

This is on a PI2w with the latest OS installed.

I get this error on the pantilt.py

[Dentonknifeworks]

Still a issue

[the-resweller]

@Dentonknifeworks hey man, was having the same issues. apparently some python update changed the way bus.write_word_data uses its arguments. this is what I changed and I can jog the camera now.

Modified by: Wes @ SparkFun

Written by: Mike Hord @ SparkFun

Modified example code for 50Hz and calibrated with servo using an oscilloscope.

#!/usr/bin/env python

import smbus
import time

bus = smbus.SMBus(1)
addr = 0x40

def scale(x, in_min, in_max, out_min, out_max):
return (x - in_min)*(out_max - out_min)/(in_max - in_min) + out_min

enable the PC9685 and enable autoincrement

bus.write_byte_data(addr, 0, 0x20) # enable the chip
time.sleep(.1)
bus.write_byte_data(addr, 0, 0x10) # enable Prescale change as noted in the datasheet
time.sleep(.1) # delay for reset
bus.write_byte_data(addr, 0xfe, 0x88) #changes the Prescale register value for 50 Hz, using the equation in the datasheet (I later adjusted the value to fine tune the signal with an oscilloscope. The original value was 0x79.)
time.sleep(.1)
bus.write_byte_data(addr, 0, 0x20) # enables the chip

time.sleep(.1)
bus.write_word_data(addr, 0x06, 0) # chl 0 start time = 0us
bus.write_word_data(addr, 0x08, 350) # chl 0 end time = 1.5ms (I later adjusted the value to fine tune it to the servo I was testing with. The original value was 312.)

bus.write_word_data(addr, 0x0a, 0) # chl 1 start time = 0us
bus.write_word_data(addr, 0x0c, 350) # chl 1 end time = 1.5ms (I later adjusted the value to fine tune it to the servo I was testing with. The original value was 312.)

while True:
pipein = open("/var/www/html/FIFO_pipan", 'r')
line = pipein.readline()
line_array = line.split(' ')
if line_array[0] == "servo":
pan_setting = scale(int(line_array[1]), 80, 220, 250, 440) # I later adjusted the value to fine tune it to the servo I was testing with. The original position values were 209 and 416.
tilt_setting = scale(int(line_array[2]), 50, 250, 250, 440) # I later adjusted the value to fine tune it to the servo I was testing with. The original position values were 209 and 416.
bus.write_word_data(0x40,0x08, int(pan_setting))
bus.write_word_data(0x40,0x0c, int(tilt_setting))
pipein.close()