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Search took 0.01 seconds. Search: Posts Made By: DJBecker
Forum: Open ReVolt: open source DC motor controller 03-16-2012, 01:49 PM
Replies: 7,381
Views: 2,410,154
Posted By DJBecker
Which firmware has tachometer input support? I...

Which firmware has tachometer input support? I didn't realise that it had been added.

When we added tachometer code I tried several approaches. I found that using an input capture pin was...
Forum: Open ReVolt: open source DC motor controller 02-14-2012, 06:29 PM
Replies: 7,381
Views: 2,410,154
Posted By DJBecker
Be very, very careful if you use a serial...

Be very, very careful if you use a serial bootload on the AVR.

We built our first controller around the Arduino Mega board, with signal conditioning and the CAN controller on a shield and a...
Forum: Aerodynamics 01-30-2012, 03:50 PM
Replies: 12
Views: 5,272
Posted By DJBecker
Hmmm, I know this type of patent. "It...

Hmmm, I know this type of patent.

"It probably doesn't work. We certainly haven't shown it does. But if it does work and someone figures it out how to make it practical, they'll have to pay us...
Forum: Open ReVolt: open source DC motor controller 01-18-2012, 09:24 AM
Replies: 7,381
Views: 2,410,154
Posted By DJBecker
We've had failures like that. The cause was...

We've had failures like that.

The cause was the MOSFETs shorting the gate to the drain during failure, applying pack voltage to the gate driver circuit. The underlying cause was counterfeit IR...
Forum: Open ReVolt: open source DC motor controller 01-14-2012, 12:40 AM
Replies: 7,381
Views: 2,410,154
Posted By DJBecker
It doesn't look as if we took any pictures that...

It doesn't look as if we took any pictures that show the finished result. We were trying to get the same same effect as PowerTab or SuperTab part -- a wide, flat tab for both the source and drain...
Forum: Open ReVolt: open source DC motor controller 01-13-2012, 07:29 PM
Replies: 7,381
Views: 2,410,154
Posted By DJBecker
Our motor control board is based on a STM32...

Our motor control board is based on a STM32 processor in a 64 pin package. The lower section is has a 5V regulator and CAN transceiver. It's isolated from the upper section with a DC-DC converter...
Forum: Open ReVolt: open source DC motor controller 01-11-2012, 06:06 PM
Replies: 7,381
Views: 2,410,154
Posted By DJBecker
Our controller has software-only overcurrent...

Our controller has software-only overcurrent control, which means we are much more careful about it. (Plus we had two batches of counterfeit IR MOSFETs which caused us to rewrite the limit code a...
Forum: Open ReVolt: open source DC motor controller 11-07-2011, 08:41 AM
Replies: 7,381
Views: 2,410,154
Posted By DJBecker
Are these two, three or four pin fans? Two...

Are these two, three or four pin fans?

Two pin fans take just +12V. A few have external thermal sensors on a short wire that influences the speed, but most spin at full speed all of the time.
...
Forum: Open ReVolt: open source DC motor controller 09-16-2011, 10:05 AM
Replies: 13
Views: 3,612
Posted By DJBecker
The DC-DC converter will have a high frequency...

The DC-DC converter will have a high frequency triangle wave of 10mV-100mV superimposed on it's output. If it's higher (it likely is, or you wouldn't have mentioned it), check for a problem in the...
Forum: Open ReVolt: open source DC motor controller 08-06-2011, 12:39 PM
Replies: 436
Views: 84,649
Posted By DJBecker
There is pretty much only one choice for an...

There is pretty much only one choice for an add-on CAN controller chip. The MCP2515. It connects to a 4 wire SPI bus. The Cougar board has almost every signal needed on the ISP programming header...
Forum: Open ReVolt: open source DC motor controller 08-06-2011, 12:05 PM
Replies: 14
Views: 7,006
Posted By DJBecker
Everything is Open Source -- GPL for the...

Everything is Open Source -- GPL for the firmware.

I've put most of the CAN related code on

obd2-instruments - Automotive CAN bus implemention including OBD2 reporting and gauge/display drivers...
Forum: Open ReVolt: open source DC motor controller 08-03-2011, 06:31 PM
Replies: 436
Views: 84,649
Posted By DJBecker
I'll complete this translation if others find it...

I'll complete this translation if others find it useful:

cougarlcd.c - obd2-instruments - Automotive CAN bus implemention including OBD2 reporting and gauge/display drivers - Google Project...
Forum: Open ReVolt: open source DC motor controller 06-22-2011, 07:13 PM
Replies: 7,381
Views: 2,410,154
Posted By DJBecker
We've switched over to the STM32 series, with the...

We've switched over to the STM32 series, with the STM32f105 installed on our current board.

They give you another factor of 10 in speed, and probably an additional factor of 10 in pain to program...
Forum: Open ReVolt: open source DC motor controller 05-30-2011, 09:51 AM
Replies: 164
Views: 51,919
Posted By DJBecker
That's not quite the same as desaturation...

That's not quite the same as desaturation detection.

Desaturation detection samples the voltage drop across the device when it's supposed to be fully on. If it rises above the desired level, you...
Forum: Open ReVolt: open source DC motor controller 05-23-2011, 11:24 AM
Replies: 7,381
Views: 2,410,154
Posted By DJBecker
My reading of the Cougar source code has the HPL...

My reading of the Cougar source code has the HPL / High Pedal Lockout check being done independently of the PRECHARGE_WAIT / contactor timeout. Someone that doesn't understand the delay, or just...
Forum: Open ReVolt: open source DC motor controller 05-15-2011, 10:10 AM
Replies: 7,381
Views: 2,410,154
Posted By DJBecker
The URL for those parts didn't work. But I'm...

The URL for those parts didn't work. But I'm guessing that it's a capacitive line filter, not a transformer. If so, you are implementing a capacitor level shifter.

That's good for a local...
Forum: Open ReVolt: open source DC motor controller 05-10-2011, 01:29 PM
Replies: 436
Views: 84,649
Posted By DJBecker
That's the expected behavior for software-driven...

That's the expected behavior for software-driven BMW fuel gauges.

The instrument cluster computer has special code to make a better guess at the actual fuel level. It appears to have been added...
Forum: Fossil Fuel Free 05-03-2011, 12:39 PM
Replies: 385
Views: 117,557
Posted By DJBecker
You forgot to add the caveat "with a suitably...

You forgot to add the caveat "with a suitably large inductor". I'm sure you know this, but not the casual reader.

Without output smoothing, the Cougar will have bad behavior with many batteries. ...
Forum: Open ReVolt: open source DC motor controller 02-18-2011, 01:54 PM
Replies: 7,381
Views: 2,410,154
Posted By DJBecker
How much? You should probably put a $$...

How much?

You should probably put a $$ amount on all of the boards, just in case there are people that want to slip a few more orders in before they wake in China.
Forum: Open ReVolt: open source DC motor controller 01-31-2011, 11:50 AM
Replies: 31
Views: 17,975
Posted By DJBecker
Hmmm, is there a wiki page for this yet? I've...

Hmmm, is there a wiki page for this yet? I've read the Cougar code pretty carefully and could likely add some useful info.

The comment about "a weird pot that doesn't close or open all the way"...
Forum: Open ReVolt: open source DC motor controller 01-20-2011, 11:56 AM
Replies: 7,381
Views: 2,410,154
Posted By DJBecker
I can see that as an issue. We are wiring...

I can see that as an issue. We are wiring directly to the power device pins, which puts extra material high up on the leg of the device. That reduces the resistance and provides a heftier thermal...
Forum: Open ReVolt: open source DC motor controller 12-17-2010, 01:33 AM
Replies: 7,381
Views: 2,410,154
Posted By DJBecker
It's not very difficult to have an AVR use a...

It's not very difficult to have an AVR use a Microchip MCP2515 CAN controller over SPI. And the chip is very inexpensive -- Avnet has them $1.72 in a DIP, with the MCP2551 transceiver costing only...
Forum: Open ReVolt: open source DC motor controller 12-04-2010, 08:47 AM
Replies: 7,381
Views: 2,410,154
Posted By DJBecker
I should have mentioned my requirements for the...

I should have mentioned my requirements for the RPM estimation, since they are more demanding than some might expect. We can't just count rotations and report the counter value a minute later. We...
Forum: Open ReVolt: open source DC motor controller 12-03-2010, 09:31 AM
Replies: 7,381
Views: 2,410,154
Posted By DJBecker
That's the table approach. Just pick a few point...

That's the table approach. Just pick a few point to measure the temperature response, build a table, and interpolate between the values. You can do a higher-order interpolation, but just a linear...
Forum: Open ReVolt: open source DC motor controller 12-03-2010, 02:50 AM
Replies: 7,381
Views: 2,410,154
Posted By DJBecker
The Cougar board uses a NTC thermistor. It's...

The Cougar board uses a NTC thermistor. It's inexpensive and easy to design around, but it's not linear. Combined with the loose tolerance of the surrounding resistors, you won't be able to do a...
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