I'm trying to (learn and) use python to send a serial command to a servo controller. My current code is as follows:

import serial
import time

ser=serial.Serial('COM7',9600)
i=0
print 'START'

while(i<5):
    ser.write('#0P500S750<cr>')
    time.sleep(2)
    ser.write('#0P2500S750<cr>')
    time.sleep(2)
    print 'sweep'
    i=i+1

print 'STOP'

The device moves the servo based on the received serial command. #0P500S750<cr> translates to port 0, position 2500, speed 750. The command is terminated for the device with <cr>.

I'm not sure what I'm doing wrong. I am currently using python 2.7.13

thanks in advance

Good day. I'm trying to send a 'list' through a serial port. The list has three items. [string, string, tuple]

I can send individual strings without an issue, but when I try to send a list items it doesn't work. It says must be a 'string'.

Perhaps there is a way to easily convert a list into a 'string' or 'byte' object. I've tried that, but I have issues converting the 'list' from 'string' back to the original 'list' on the other side.

Any suggestions or guidance would be appreciated.

import serial

lst_data = []

ser = serial.Serial(
    port='/dev/ttyAMA0',
    baudrate = 9600,
    parity=serial.PARITY_NONE,
    stopbits=serial.STOPBITS_ONE,
    bytesize=serial.EIGHTBITS,
    timeout=1)

if ser.isOpen == True:
    ser.close()
    
def write(string):
    if ser.isOpen() == False:
        ser.open()
    ser.write(string)
    ser.close()

I want to be able to pass 'write(['hello', 'world', ('hello','world')])'

Someone suggested using ",".join(list), but it doesn't work. I can't because list[2] is a tuple.

>>string_data = ",".join(data)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: sequence item 2: expected string, tuple found