The motor brushless doesn't work

[DavideFInocchi]

Hi, i'm starting to use for the first time the modelcar, so i was trying to use the public topic of ros to control the motorbrushless work. I send in the command line the topics found on the wiki.
( $ rostopic pub -r 1 /manual_control/steering std_msgs/Int16 '{data: 90}'
$ rostopic pub -r 1 /manual_control/speed std_msgs/Int16 '{data: 500}'
$ rostopic pub -r 1 /manual_control/lights std_msgs/String '{data: le}')
But this topic:" $ rostopic pub -r 1 /manual_control/speed std_msgs/Int16 '{data: 500}' " doesn't work, there aren't error message, only the wheels don't turn. what's going wrong?
thanks for the reply.
P.S: i have a version 3-kinetic

[sundermann]

The /manual_control/speed topic is checked for obstacles by the auto_stop node. If there are obstacles in front or behind (depending on the speed direction9 the car it will not move to prevent a crash. Make sure you do not have any obstacles in front or behind the car before sending commands.

[DavideFInocchi]

I put the car on the floor and in front and behind there wasn't obstacles. Is it possible that the motors can't start beacuse the Vin is 5 volt? Or there is some setting which i don't know?

[DavideFInocchi]

that's my catkin_ws and my car, i think this is v3-kinetic, so i don't know why the wheels don't turn

[AutoModelCar]

You get the error which is Unable to communicate with Master, which means you did not run the roscore at all! Please check first what is output of
rostopic list
Then open the autostart.sh , and check which file should be run .
vim autostart.sh
you can try to run the launch file from terminal to check which errors you would get.
roslaunch manual_control manual_odroid.launch

[DavideFInocchi]

i think there is this errore because i have connected in lan, because when i used the wifi this error didn't appear, anyway i remember that i tryed to launch roslaunch manual_control manual_odroid.launch but the odroid crash and all sensor goes down, today im going to try again to launch this file and will post the result.

[AutoModelCar]

To communicate with the motor, the "send_steering_light_speed" node should be run. So if all nodes are crashed then nothing runs and you could not send any commands or receive any messages!

roslaunch send_steering_light_speed servo_light_odroid.launch

[DavideFInocchi]

i did some try to explane you what is going wrong, file autostart run nodes and all work without error, so i tryed to do some topics, and all work except speed.



when i send the topic for the speed, there aren't error message and there isn't obstacle around the car.

this is the odometry

that's all.

[AutoModelCar]

Did you check motor cable as well ?

[AutoModelCar]

Put the car on a box/ book. To be sure if its wheels rotate ,it will not move. To stop auto_stop, run the auro_stop in the terminal and then break it with ctrl + c

roslaunch auto_stop auto_stop.launch

Ctrl + c

[sundermann]

Once you stopped auto_stop you can try publishing directly to the car by publishing the speed onto /checked/speed:

$ rostopic pub /checked/speed std_msgs/Int16 '{data: 500}'

[AutoModelCar]

could you send us the output of rostopic list

[DavideFInocchi]

the first things done was to control the cable and they are connected well, also i put the car on book and the wheels manually rotate. So i did your istruction to stop autostop without any error, and send the checked rostopic:

this is the rostopic list:

[sundermann]

When you tried to send onto /checked/speed you mispelled the type thus the error. The commands are case sensitive so make sure you got the right command! From the rostopic list it seems like the topic /checked/speed is missing. Can you also give us the output of rosnode list?

[DavideFInocchi]

i don't understand what i misspelled

[sundermann]

The message type should had been std_msgs/Int16 instead of std_msgs/int16