Trying to get Spike Motors to run Using Time

[AlexMaxNZ]

Hello, I'm recently new to pybricks and have come to a roadblock. I'm trying to get mt FLL robot to move its arms using time instead of angle because of issues, I have gotten it to work but need the motor to run in the opposite direction. Any ideas of how to do this?

Thanks

[dlech]

In general, you can use a negative speed to make the motor run in the negative direction (and you can set the positive direction to clockwise or counterclockwise when you create the motor object).

[AlexMaxNZ]

Thanks for your help.

[AlexMaxNZ]

I've now tried this and it's spinning in the same direction even if I change from positive to negative.
Do you have any other ideas?

[dlech]

Can you share the code you are having problems with?

[AlexMaxNZ]

I defined some of the code to make it easier.

from pybricks.hubs import PrimeHub
from pybricks.pupdevices import Motor, ColorSensor, UltrasonicSensor, ForceSensor
from pybricks.parameters import Button, Color, Direction, Port, Side, Stop
from pybricks.robotics import DriveBase
from pybricks.tools import wait, StopWatch
from pybricks.tools import hub_menu
from pybricks.tools import multitask, run_task
from pybricks.tools import hub_menu
hub = PrimeHub()

left_motor = Motor(Port.A, Direction.CLOCKWISE)
right_motor = Motor(Port.B, Direction.COUNTERCLOCKWISE)
f_motor = Motor(Port.D)
b_motor = Motor(Port.C)

drive_base = DriveBase(left_motor, right_motor, wheel_diameter=56, axle_track=128)
drive = drive_base.straight
turn = drive_base.turn
curve = drive_base.curve
backM = b_motor.run_angle
frontM = f_motor.run_angle
speed = drive_base.settings #slow=(100, 375, 75, 375) #fast=(850, 1000, 850, 1000)

#Start of Code

speed(500, 500, 250, 250)
drive(470)
wait(200)
turn(38.75)
speed(400, 400, 300, 300)
drive(400)
frontM(1000, 102)
frontM(1000, 25)
frontM(70, -125)
speed(850, 1000, 850, 1000)
drive(-260)
turn(20)
backM(1000, -110)
turn(97)
drive(750)

[AlexMaxNZ]

Sorry wrong code

from pybricks.hubs import PrimeHub
from pybricks.pupdevices import Motor, ColorSensor, UltrasonicSensor, ForceSensor
from pybricks.parameters import Button, Color, Direction, Port, Side, Stop
from pybricks.robotics import DriveBase
from pybricks.tools import wait, StopWatch
from pybricks.tools import hub_menu
from pybricks.tools import multitask, run_task
from pybricks.tools import hub_menu
hub = PrimeHub()

left_motor = Motor(Port.A, Direction.CLOCKWISE)
right_motor = Motor(Port.B, Direction.COUNTERCLOCKWISE)
f_motor = Motor(Port.D)
b_motor = Motor(Port.C)

drive_base = DriveBase(left_motor, right_motor, wheel_diameter=56, axle_track=128)
drive = drive_base.straight
turn = drive_base.turn
curve = drive_base.curve
backM = b_motor.run_angle
frontM = f_motor.run_angle
speed = drive_base.settings #slow=(100, 375, 75, 375) #fast=(850, 1000, 850, 1000)

#Start of Code

speed(500, 500, 250, 250)
drive(470)
wait(200)
turn(38.75)
speed(400, 400, 300, 300)
drive(400)
f_motor.run_time(1000, 1)
frontM(70, -125)
speed(850, 1000, 850, 1000)
drive(-260)
turn(20)
backM(1000, -110)
turn(97)
drive(750)

[dlech]

f_motor.run_time(1000, 1)

I assume this is the part you are asking about?

This says to run the motor at 1000 deg/sec for 1 millisecond, so this isn't enough time for the motor to even start moving.

[AlexMaxNZ]

Thank you very much for that, we will be able to finish to code now.