My ev3 brick will not start

[lizisawizard]

What are you trying to do?

I'm using the ev3dev and program my robot in python.

What did you expect to happen?

Before, it started fine. It displayed the proper screen and it connected to visual studios ok.

What actually happened?

Instead, it started, but didn't flash the expected amber light and displayed “Alert! /dev/mmcblk0p2 does not exist. Dropping to a shell!”.

What hardware and software are you using (including version numbers)?

I'm using the ev3dev, Python and Visual Studios.

I also had a problem getting my robot to move when it did start. It kept saying "LargeMotor(outA) is not connected". If someone could help with both problems it'd be greatly appreciated.

[dlech]

Do you have another microSD card you can try?

[lizisawizard]

@dlech Hello! I got a new microSD and it works again! Thank you! I am still getting the "LargeMotor(outB) is not connected" traceback. Do you know how to fix that?

[dlech]

Can you post your program? Have you eliminated the possibility of a bad wire or a bad motor or simply a wire not plugged in all the way?

[lizisawizard]

#!/usr/bin/env python3
from ev3dev2.motor import LargeMotor,OUTPUT_B,OUTPUT_C   #we're importing the motor function
from ev3dev2.motor import SpeedDPS, SpeedRPM, SpeedRPS, SpeedDPM #we're importing other functions related to speed
from time import sleep

a = LargeMotor(OUTPUT_B)
d = LargeMotor(OUTPUT_C)

dists = [20,60,80,50]

for r in dists:
    j = ((.0241*distances(r)) - .3596);
    if (j % 2 == 0):
        a.on_for_seconds(speed=SpeedRPS(1), seconds=(-j))
        d.on_for_seconds(speed=SpeedRPS(1), seconds=(-j))
        sleep(2)
    else:
        a.on_for_seconds(speed=SpeedRPS(1), seconds=(j))
        d.on_for_seconds(speed=SpeedRPS(1), seconds=(j))
        sleep(2)

I deducted the motors and wires are working properly and they are plugged in all the way.

[dlech]

It works for me (although I get an error later about distances not being defined).

Are the motors listed in the Device Browser on the EV3?

[lizisawizard]

They are, could it just be my brick that is the problem? I have an alternate

[dlech]

What address to the motors have in the Device Browser? (it should say something like lego-ev3-l-motor at ev3-ports:outB)

[lizisawizard]

Yeah the device browser shows that. I plugged in the new brick and it is outputting the same error. Every time I run the code a file called 'Subtask2.py.err.log' appears.

[lizisawizard]

IT WORKS NOW! i had to change clf to lf!