Lopy4 onewire has SyntaxError

[Dylan]

Hello,

I am running on the latest firmware "1.18.2.r5" with the pysense board. I am using a DS18B20 temperature sensor connected to Pin 10. The code will work for awhile but eventually had this error:

Traceback (most recent call last):
File "main.py", line 15, in <module>
File "onewire.py", line 215
SyntaxError: invalid syntax

Line 15 in main.py:

from onewire import DS18X20

Line 215 in onewire.py:

temp_msb = data[1]

Any idea what could be causing this? I am using all the libraries supplied by Pycom for DS18X20 and onewire

[jcaron]

@Dylan have you checked that the onewire.py file has been correctly uploaded? Maybe try to re-upload it.

Also check that you don’t have any files with the same name lying around which could cause confusion.

[Dylan]

I've uploaded a few times, uploads with no errors. I've got a work around by doing:

def get_temp():
    temp_value = None
    count = 0
    while temp_value == None:
        try:
            count = count + 1
            print(temp_value)
            temp2.start_conversion()
            time.sleep(1)
            temp_value = temp2.read_temp_async()
            time.sleep(1)
            if count == 2:
                machine.reset()
        except SyntaxError:
            print("\n")
            print("\n")
            print("\n")
            print("\n")
            print("syntax error")
            print("\n")
            print("\n")
            print("\n")

            time.sleep(0.5)
            machine.reset()
    return(temp_value)

I know machine.reset() is probably not the best approach but it's the simplest that I know :P

[robert-hh]

@Dylan I just tried that code, and it works. Do you have a 4.7 kOhm Pull-up resistor between Vdd and Data of the DS18B20?