Go Back   EcoModder Forum > EcoModding > Fossil Fuel Free > Open ReVolt: open source DC motor controller
Register Now
 Register Now
 

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 07-14-2009, 07:55 PM   #2011 (permalink)
EcoModding Lurker
 
Join Date: Jun 2009
Location: Isle of Man
Posts: 8
Thanks: 0
Thanked 1 Time in 1 Post
Hi Squiggles, I see you made the same mistake I made at first (5V / 10K + 1K).
It's actually 0.455mA!!
When I ran the numbers I thought as well as developing a wonderful controller, the group had also invented a magical current vanisher too!

Rob

  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 07-14-2009, 08:13 PM   #2012 (permalink)
PaulH
 
MPaulHolmes's Avatar
 
Join Date: Feb 2008
Location: Maricopa, AZ (sort of. Actually outside of town)
Posts: 3,832

Michael's Electric Beetle - '71 Volkswagen Superbeetle 500000
Thanks: 1,362
Thanked 1,202 Times in 765 Posts
Thanks you guys for fixing my mistake! R12 is after R11. I'm such a whippersnapper! Yes, it is good to assume they are set to output. Man, that has been a problem for maybe 1.5 months. Holy cow! "Oh no! It's latching up!" Idiot!@! aaaaaaaaaaaaaahhhhhhhhhhhhh!!!

I'm putting together a basic serial output thing right now for tuning the PI loop. I'm really looking forward to seeing what sort of data comes from that.
__________________
kits and boards
  Reply With Quote
Old 07-14-2009, 09:05 PM   #2013 (permalink)
EcoModding Lurker
 
Join Date: Jun 2009
Location: Isle of Man
Posts: 8
Thanks: 0
Thanked 1 Time in 1 Post
Hi Paul, as an aside. The HIN202CP rs232 tx/rx that you've specced isn't lead free.
It might be worthwile checking the entire BOM to make sure.
I'm concerned that disgruntled controller manufacturers might point the finger and effectively block export of any kit sales, certainly to Europe anyway!

cheers Rob
  Reply With Quote
Old 07-14-2009, 09:58 PM   #2014 (permalink)
PaulH
 
MPaulHolmes's Avatar
 
Join Date: Feb 2008
Location: Maricopa, AZ (sort of. Actually outside of town)
Posts: 3,832

Michael's Electric Beetle - '71 Volkswagen Superbeetle 500000
Thanks: 1,362
Thanked 1,202 Times in 765 Posts
Lead never hurt anyone, well except for lead bullets and poisonous paint and poison water and birth defects and stuff like that.

How do you guys fish over there without sinkers??!
__________________
kits and boards
  Reply With Quote
Old 07-14-2009, 10:40 PM   #2015 (permalink)
MAD Modder
 
Join Date: May 2008
Location: NorCal
Posts: 70
Thanks: 0
Thanked 3 Times in 3 Posts
Quote:
Originally Posted by MPaulHolmes View Post
Lead never hurt anyone, well except for lead bullets and poisonous paint and poison water and birth defects and stuff like that.

How do you guys fish over there without sinkers??!
Ha!

But seriously, the EU is big on not letting Chinese kids die from open lead fires caused by old equipment recycling, the solution? No lead in old equipment.

Probably best to spec it without, or fail to include it and label the kit "ROHS RS-232 free"

I am glad to see it coming along, I hope that guy with the new controller has a chance to test it

  Reply With Quote
The Following User Says Thank You to nubie For This Useful Post:
mpgmike (01-12-2022)
Old 07-14-2009, 10:58 PM   #2016 (permalink)
EcoModding Lurker
 
Join Date: Jun 2009
Location: Isle of Man
Posts: 8
Thanks: 0
Thanked 1 Time in 1 Post
yes yes very drole, but as it happens ..

No fishing weights made of lead may be used except those of 0.06 grams or less and those of more than 28.35 grams.
We haven't got any fish left anyway, the French and Russians have nicked them all!

Sticking to the controller though, the 'Pb free' thing of course relates to the soldering as well, a real pain trying to achieve a nice joint on heat hungry components.
  Reply With Quote
Old 07-15-2009, 11:39 PM   #2017 (permalink)
PaulH
 
MPaulHolmes's Avatar
 
Join Date: Feb 2008
Location: Maricopa, AZ (sort of. Actually outside of town)
Posts: 3,832

Michael's Electric Beetle - '71 Volkswagen Superbeetle 500000
Thanks: 1,362
Thanked 1,202 Times in 765 Posts
I'm getting 4000 samples of the current per second through the serial port at 19.2 kbps. I'm just sending a raw number that is from 0 to 213 (about), where 0 means 0 amps, and 213 means 500 amps (about). I'm sending no CR or LF. The truly awesome "realterm" program that I'm using adds spaces between the data, and then I can put it in Excel or something and see some graphs. Oh ya! A step response with maybe 10000 data points is going to be nice! I thought 19.2 was going to be too slow! haha!

I also changed the program to make the current reading more exact. Before it was off by about 7 amps. I was using vRef = 2.5v, but the datasheet showed that there was a bit of variation possible, so I did a sample of the current at 0 amps (16 reads) and averaged them, which now shows 0 amps right now on the serial terminal (before it said 7 amps), which it IS! I don't have that dang thing hooked up to a car! There's no current going through it!

I want to make a database of motors, and the optimal P and I for each motor, given a persons preference for how the throttle should feel. As Adam was saying, various "profiles"! ya!

Here are a couple pictures of the setup in the room (I also added 32 other pictures of Ben's assembly. Some of it wasn't photographed because I ran out of stupid batteries!!!!!!!!! makes me mad):

Ben's Open Revolt Cougar Controller, battery for powering it, stk500, oscilloscope, serial port plug thing.


What's this? Motor current being blasted to the screen at 4000 samples per second? I think it is! ya!
__________________
kits and boards
  Reply With Quote
Old 07-16-2009, 08:06 AM   #2018 (permalink)
EcoModding Lurker
 
blowncurtice's Avatar
 
Join Date: Mar 2009
Location: Victoria Australia
Posts: 30
Thanks: 0
Thanked 4 Times in 2 Posts
I have just finished a new Australian Parts list and cost. does not include the two boards, I am hoping that those will be organised in the US.
John
Attached Files
File Type: zip Cougar Controller Parts List Aus 2C.zip (8.1 KB, 106 views)
  Reply With Quote
Old 07-16-2009, 01:12 PM   #2019 (permalink)
EcoModding Lurker
 
Join Date: Apr 2009
Location: Maine
Posts: 26
Thanks: 0
Thanked 1 Time in 1 Post
Quote:
Originally Posted by MPaulHolmes View Post
I disabled all pull up resistors (Thanks, JayC), and the dang blasted thing still didn't work! monkey poo! I thought that would be it for sure! But then I added a temporary pull down resistor from PIN 5 of U5B to Ground (is that redundant? hehe), and it seems to work! Maybe I'll just solder a 2 or 3k resistor there and test that monkeypoo out!
just read this and haven't read forward yet, so maybe you have it now, but this sounds to me like you had an unexpected load / resistance imbalance. The added resistor may be fixing the problem, but I would look further to find the cause of the imbalance; you may just have to change the value of an existing pull up of pull down.
__________________
"Experience is something you get right after you need it !"

http://www.diyelectriccar.com/garage/cars/143

http://www.diyelectriccar.com/forums...tor-32083.html
  Reply With Quote
Old 07-16-2009, 01:28 PM   #2020 (permalink)
EcoModding Lurker
 
Join Date: Apr 2009
Location: Maine
Posts: 26
Thanks: 0
Thanked 1 Time in 1 Post
I just read up to here and I see you got the over current latch up issue fixed, so I guess disregard my last.

As far as current sensors go, I wish there was a reasonably priced hall sensor for 1000A so far all I can find is like $100. I am probably going to read of of my shunt instead, but at 75mv full scale, that is going to be difficult to get an accurate trip point set. Any recommendations for either option?

__________________
"Experience is something you get right after you need it !"

http://www.diyelectriccar.com/garage/cars/143

http://www.diyelectriccar.com/forums...tor-32083.html
  Reply With Quote
Reply  Post New Thread


Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
Paul and Sabrina's Cheap 3 Phase Inverter (AC Controller) with Field Oriented Control MPaulHolmes Fossil Fuel Free 3431 05-04-2022 06:43 PM
Paul & Sabrina's Cheap EV Conversion MPaulHolmes Fossil Fuel Free 542 11-12-2016 10:09 PM
Three Dirt Cheap DIY Electric Cars - Part 5 SVOboy EcoModder Blog Discussion 0 12-12-2008 05:10 PM



Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com