Search found 249 matches

by vedder
Jul 07 2015 7:23am
Forum: Stand-up E-scooters and E-skateboards
Topic: KV vs Gearing?
Replies: 46
Views: 5051

Re: KV vs Gearing?

Now, electrical losses are proportional to the electrical power put into the motor, which is given by P = I*I*R. The way the manufacturers actually achieve the different kv ratings is by changing the number of turns in the motor. Motor 1 has twice the number of turns as motor 2. Obviously, this req...
by vedder
Jul 07 2015 7:06am
Forum: Stand-up E-scooters and E-skateboards
Topic: 10S custom skate ESC: testers wanted!
Replies: 1520
Views: 222151

Re: 10S custom skate ESC: testers wanted!

This is just a little notice to anyone updating their VESC to latest firmware version 1.7. I have made the update a few minute ago with encountering an error and a possible solution. First off my version of Ubuntu I use is 14.10 but methods here apply to any version of Ubuntu 14.XX and maybe Ubuntu...
by vedder
Jun 23 2015 2:17pm
Forum: Stand-up E-scooters and E-skateboards
Topic: 10S custom skate ESC: testers wanted!
Replies: 1520
Views: 222151

Re: 10S custom skate ESC: testers wanted!

@vanarian: if your BMS doesn't allow regenerative current to flow to the battery, this will limit battery voltage, but it does not mean it will prevent the motor/controller voltage to rise; I even think the opposite: there will be nothing to help limit this voltage rise, except the input capacitors...
by vedder
Jun 23 2015 10:22am
Forum: Stand-up E-scooters and E-skateboards
Topic: 10S custom skate ESC: testers wanted!
Replies: 1520
Views: 222151

Re: 10S custom skate ESC: testers wanted!

Oh nooooooooo ... I have 230KV motors !! Would it be OK with 10S ? 230kv and 10s should work fine. @Vanarian: How do you make sure you max at 3.6Volts only for your 14s ? The slightest regen will make voltage override this 3.6 volts, unless there is a trick ? The trick is in my battery setup, I wen...
by vedder
Jun 19 2015 4:50pm
Forum: Stand-up E-scooters and E-skateboards
Topic: Adding hall sensors to 63mm motor and vesc testing
Replies: 36
Views: 7822

Re: Adding hall sensors to 63mm motor and vesc testing

The new hall sensor implementation with hybrid mode and auto detection is now pushed to github. It should be quite easy to use: 1. When running detect for the sensorless parameters, the hall sensors are also detected and a table for them is generated and printed. 2. Enter the detected table and choo...
by vedder
Jun 19 2015 12:07pm
Forum: Stand-up E-scooters and E-skateboards
Topic: Adding hall sensors to 63mm motor and vesc testing
Replies: 36
Views: 7822

Re: Adding hall sensors to 63mm motor and vesc testing

I was up late yesterday and spent some hours today on the new hall sensor implementation. It should work for any spacing and any connection order. The detect function now also detects how the hall sensors are connected and prints a table that can be entered, so there is no need to reconnect the sens...
by vedder
Jun 18 2015 5:24am
Forum: Stand-up E-scooters and E-skateboards
Topic: 10S custom skate ESC: testers wanted!
Replies: 1520
Views: 222151

Re: 10S custom skate ESC: testers wanted!

I know no one has asked this question. How does one go about removing flux from the VESC after resoldering. I only have rosin base soldering flux which is tacky. I was thinking of dunking it in a bath of 99% isopropyl alcohol to clean it. A bath of isopropyl works perfectly for cleaning the board. ...
by vedder
Jun 18 2015 2:42am
Forum: Stand-up E-scooters and E-skateboards
Topic: VESC throttle issue
Replies: 8
Views: 1660

Re: VESC throttle issue

Nice! Please let me know how it works when you have tested it.

It would be good if you could connect the nunchuk directly to the i2c port of the VESC without using the wiiceiver. Then you get extra features such as closed loop cruise control and a better experience in general.
by vedder
Jun 17 2015 7:10pm
Forum: Stand-up E-scooters and E-skateboards
Topic: 10S custom skate ESC: testers wanted!
Replies: 1520
Views: 222151

Re: 10S custom skate ESC: testers wanted!

Here is a video where I replace a DRV8302: O7vaW27kdLo I had my hand in the way most of the time, but I didn't want to desolder and resolder the chip again just to remake the video. I did not pre-heat the board and had the hot air set to 350 degC (I think my ebay hot air station gives lower temperat...
by vedder
Jun 17 2015 8:16am
Forum: Stand-up E-scooters and E-skateboards
Topic: Adding hall sensors to 63mm motor and vesc testing
Replies: 36
Views: 7822

Re: Adding hall sensors to 63mm motor and vesc testing

There seems to be much interest for good hall sensor support, so I will work on that in the next days before I go another trip to present another paper for my phd. I only have a sensored inrunner to test with on my RC car, but at least I can get all settings working. It would be nice to test the imp...
by vedder
Jun 16 2015 7:56pm
Forum: Stand-up E-scooters and E-skateboards
Topic: VESC throttle issue
Replies: 8
Views: 1660

Re: VESC throttle issue

COOL! I can do that. I'll reconnect and adjust. Otherwise it runs awesome on the bench and can't wait to get it on my test board!!! I have 2 more to solder up. Got the shrink tube yesterday so going to wrap it up so it's protected and looks nice and clean. Firmware question - is there a downloadabl...
by vedder
Jun 16 2015 6:23pm
Forum: Stand-up E-scooters and E-skateboards
Topic: VESC throttle issue
Replies: 8
Views: 1660

Re: VESC throttle issue

Nice that you got everything running so far :-) You have to adjust minimum pulsewidth and maximum pulsewidth. The current measured pulsewidth is shown next to the display bar. The minimum pulsewidth is what you see when you hold full brake and the maximum pulsewidth is what you see when you hold ful...
by vedder
Jun 16 2015 4:05am
Forum: Stand-up E-scooters and E-skateboards
Topic: 10S custom skate ESC: testers wanted!
Replies: 1520
Views: 222151

Re: 10S custom skate ESC: testers wanted!

It seems like lots of things have been happening which is nice. I just got back from Denver and have to go on a trip next week again, so currently I don't have so much time. I will try to integrate all the cross-platform updates to the main code branches and test them as soon as I can. It is really ...
by vedder
Jun 10 2015 8:59pm
Forum: Stand-up E-scooters and E-skateboards
Topic: Open Source Arduino transmitter/receiver for (V)ESC
Replies: 122
Views: 21148

Re: Open Source Arduino transmitter/receiver for (V)ESC

The VESC already has support for the nrf24l01+. Only the nunchuk interface is implemented, but it is easy to extend the code to get data back from the nrf. To connect the nrf to the VESC: CE -> Tied to VCC CSN -> The servo input (you have to remove the lowpass filter on the servo input) SCK -> The A...
by vedder
Jun 10 2015 7:03am
Forum: Stand-up E-scooters and E-skateboards
Topic: 10S custom skate ESC: testers wanted!
Replies: 1520
Views: 222151

Re: 10S custom skate ESC: testers wanted!

@vedder: from your bootloader scheme description, my VESC should be stuck at point 1 (98% shown) and then normal operation should resume upon next startup - which is not the case (blue LED on, USB port not recognized, board power consumption around 20mA @12V once capacitor charged) I suspect the 98...
by vedder
Jun 07 2015 2:07pm
Forum: Stand-up E-scooters and E-skateboards
Topic: 10S custom skate ESC: testers wanted!
Replies: 1520
Views: 222151

Re: 10S custom skate ESC: testers wanted!

It is difficult to tell from one of the photos, but it looks like the short pin on one of the FETs (the one between all source pins) is shorted shorted with one of the source pins. The short pin is drain, and if you short it with source the FET will become shorted. If that is the case, it is what ca...
by vedder
Jun 06 2015 7:24pm
Forum: Stand-up E-scooters and E-skateboards
Topic: 10S custom skate ESC: testers wanted!
Replies: 1520
Views: 222151

Re: 10S custom skate ESC: testers wanted!

Tried to make photos but the flash always gave reflections and focus problems with my smartphone, will try again tomorrow in bright daylight. But I checked for continuity between the leftmost pin of the FETs and the other pins before switching it on for the first time, because on one FET it looked ...
by vedder
Jun 06 2015 5:10pm
Forum: Stand-up E-scooters and E-skateboards
Topic: 10S custom skate ESC: testers wanted!
Replies: 1520
Views: 222151

Re: 10S custom skate ESC: testers wanted!

Thanks for your help. Just found one post by kwoolf1: I had the faint clicking problem with no detection. 777arc helped me and here's what worked in this order: 1. Disconnect everything from the VESC - motor wires, power cables, usb, everything. 2. Hook it all back together. 3. Launch BLDC_Tool. 4....
by vedder
Jun 06 2015 7:18am
Forum: Stand-up E-scooters and E-skateboards
Topic: 10S custom skate ESC: testers wanted!
Replies: 1520
Views: 222151

Re: 10S custom skate ESC: testers wanted!

How long is the wiring from the remote reciever to the vesc? I had a cable that was about 10" and this happened to me when testing if I gave it alot throttle quickly. I shortened the cable to about 4" and never had the problem again. Thanks silvasol, that helped! Shortened it and also made sure wit...
by vedder
Jun 04 2015 1:53pm
Forum: Stand-up E-scooters and E-skateboards
Topic: Adding Hall sensors for VESC?
Replies: 11
Views: 4141

Re: Adding Hall sensors for VESC?

Yes, the hybrid implementation is quite simple (not that simple though, some RPM filtering and a hysteresis is required). What I do have to spend more time on is testing the hall sensor implementation in general since I haven't done much of that. I would also like to implement an automatic mapping u...
by vedder
Jun 04 2015 1:18pm
Forum: Stand-up E-scooters and E-skateboards
Topic: 10S custom skate ESC: testers wanted!
Replies: 1520
Views: 222151

Re: 10S custom skate ESC: testers wanted!

Ahh, this is so complicated. I thought there is just active and regenerative braking from reading this thread. Now there is also just shorting the windings :) Not sure what my Mamba does, all I know is, the brakes make this squealing sound and it is powerful and smooth. Patrick from Castle said som...
by vedder
Jun 04 2015 3:40am
Forum: Stand-up E-scooters and E-skateboards
Topic: 10S custom skate ESC: testers wanted!
Replies: 1520
Views: 222151

Re: 10S custom skate ESC: testers wanted!

So there are 8 ceramic capacitors that need to be replaced on onloop's VESCs, is that right? Yes For a skateboard I think active braking is enough (you can't brake hard anyway because you'd fall off) for an onroad R/C car I am not sure. From what I understand, with active braking the currents are r...
by vedder
Jun 04 2015 2:26am
Forum: Stand-up E-scooters and E-skateboards
Topic: Adding Hall sensors for VESC?
Replies: 11
Views: 4141

Re: Adding Hall sensors for VESC?

Right now, all 120 degree configurations should work and making it work for 60 degree spacing should be easy. I would like to implement a hybrid mode that uses sensors on low speed and sensorless when going faster since sensorless is better then. Sensors that work with other common ESCs should also ...
by vedder
Jun 03 2015 2:29am
Forum: Stand-up E-scooters and E-skateboards
Topic: 10S custom skate ESC: testers wanted!
Replies: 1520
Views: 222151

Re: 10S custom skate ESC: testers wanted!

Vedder I did not for the initial test of just turning it on with the extra voltage(I had one for the 12V). Can the ESC just blow if you forget it even though there is no load on it? If so, darn my excitement and lack of capacitors :D oh well a chance to improve my soldering skills, I guess. Any tip...
by vedder
Jun 02 2015 4:59pm
Forum: Stand-up E-scooters and E-skateboards
Topic: 10S custom skate ESC: testers wanted!
Replies: 1520
Views: 222151

Re: 10S custom skate ESC: testers wanted!

akiraEC wrote:Hi Ben,
Would you also suggest to replace the 3V3 regulator ?
I think the one that you have should be fine. I changed to a lower dropout regulator just in case because there was little margin between 5V and 3.3v.