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Getting a specified rpm via ROS node

Submitted by Owl Robot on Fri, 2022-05-20 17:38

I'm trying to send a specified rpm to a VESC controller using a ROS node in python. I was able to listen over the canbus while commanding RPM in the VESC Tool and tried to copy their messages. Right now I have the node make an OS call using os.system("cansend can0 {0}".format(command) where the command is "00000-insert motor id in hex-#020008-insert RPM in hex". I have it sending messages at a rate of 10hz. This seems to work for the most part but it fails when I need to stop the robot. It seems to coast to a stop when I send 0 RPM instead of braking.

ADC Throttle Voltage Issue

Submitted by Reichen Schaller on Fri, 2022-05-20 01:02

I have had an issue with an ADC throttle and after searching through the forum I found some older threads that had people asking very similar questions but never getting them answered. (As far as I could see that is) The issue is that I am using an ADC foot throttle whose range of inputs seems to exceed that of the ~3.3v maximum for adc1. On the throttle itself it says 0.8-4.2v. Additionally, when I measure the range the VESC sets the 100% at about 80% or the throttle's range.

SETUP FOR SINGLE BRUSHED MOTOR

Submitted by mmatthews@aquav... on Fri, 2022-05-13 01:57

We have an ROV that has a MINI FSESC4.20 ESC on it . it was accidently connected with the wrong polarity and now doesnt appear to work. so we purchased a new ESC same one and need to configure if for a single BRUSHED  motor. is there a way we could connect the old ESC and get the way it was configured because we werent the people that originally set it up? If not then we are looking for some info on how to set this up for this motor. Any help would be appreicated.

Unable to Detect Motor Sensors | 100/250 VESC | HPM5000B 72v 5kw GM Motor

Submitted by Reichen Schaller on Sun, 2022-05-08 05:36

I have been trying to get a 100/250 VESC to use a HPM5000B 72v 5kw Golden Motor Motor but when I go through the motor wizard I get stuck at "Failed to Detect Motor Sensors." When I decided which sensor wire to plug into which hall I went with this: The sensor wire that matches the color of the motor wire that I plugged into motor wire A goes into sensor 1, motor wire B goes into sensor 2, etc. (I would attach a picture of the motor sensor connector but I can't figure out how to attach a picture.)

What I Know

The motor has worked previously with an ESC

Wow wow

Submitted by st0r on Sat, 2022-05-07 21:45

Hey guys,

 

been playing around with the vesc 6 mkv (incredible build quality. I wanted to cry when i unboxed it) for a couple of weeks now. I use a heavily modified Ninebot G30 Max. I run my own custom BLE, 48V pack and a 500W Monorim motor. After trying out different settings and tweaking stuff this thing now performs, well fantastic would be an understatement . 😂. Acceleration is scary to say the least. My technique is to kind of lean over the handlebar otherwise it wants to do a wheelie.  Hahaha. 
 

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