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May 09, 2012, 05:51 AM
Quad Whisperer
Discussion

Reprogram a brushless ESC to get a brushed ESC with no delays / RC Switch


Hi, I have made a new firmware for the Turnigy Plush 10A brushless ESC (old type) to make it into a no delay, instant reverse, fast response, forward and reverse brushed ESC for RC crawler cars, tanks and other skid steer vehicles. It has a switching frequence of ca 16kHz, so it does not make that annoying whining sound.

Other ESC's can probably be used for higher current capability.

It currently does not have arming, LVC or overtemp protection, but I can add that if there is a interest in it.

Source code is attached. **EDIT**: There is a newer version later in the thread.

Homemade Brushed ESC for crawlers and tanks. (1 min 8 sec)
Last edited by kapteinkuk; May 23, 2012 at 04:14 PM.
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May 09, 2012, 08:09 AM
Tri-Quad-Hexa-Octo-copters!!
Hi Rolf,
This will come in handy for a future project Thanks for posting!
Just FYI Steve also did something like this with Silabs processor fitted ESCs here: https://www.rcgroups.com/forums/show...0&postcount=13
Cheers,
Jim
Quadrocopter and Tricopter Info Mega Link Index
May 09, 2012, 09:06 AM
Registered User
rimshotcopter's Avatar
Please, can you post a wiring diagram of how the ESC is connected to the motor?

Thank you.

Edited: A brushed motor has two poles, so I am confused.
Last edited by rimshotcopter; May 09, 2012 at 09:14 AM.
May 09, 2012, 11:38 AM
Registered User
schumixmd's Avatar
Hi.
That's great Rolf. I have bought an Tunigy 20A Brushed ESC for my mini car project, but it has no reverse and it is very hard to control the card without reverse. So I was searching for this conversion for long time.

my question: will your firmware work with Tunigy Plush 25A and/or Tunigy Plush 6A and/or best option for me TowerPro Mag8 (30A)

thanks
May 09, 2012, 02:33 PM
Quad Whisperer
Quote:
Originally Posted by jesolins View Post
Hi Rolf,
This will come in handy for a future project Thanks for posting!
Just FYI Steve also did something like this with Silabs processor fitted ESCs here: https://www.rcgroups.com/forums/show...0&postcount=13
Cheers,
Jim
Quadrocopter and Tricopter Info Mega Link Index
Ok, I have not seen that one. But anyway, I like to make things myself


Quote:
Originally Posted by rimshotcopter View Post
Please, can you post a wiring diagram of how the ESC is connected to the motor?

Thank you.

Edited: A brushed motor has two poles, so I am confused.
The motor is connected to the two half bridges closest to the battery side of the ESC. (two wires closest to the capacitor)


Quote:
Originally Posted by schumixmd View Post
Hi.
That's great Rolf. I have bought an Tunigy 20A Brushed ESC for my mini car project, but it has no reverse and it is very hard to control the card without reverse. So I was searching for this conversion for long time.

my question: will your firmware work with Tunigy Plush 25A and/or Tunigy Plush 6A and/or best option for me TowerPro Mag8 (30A)

thanks
It should work on a 6A. About the two others I do not know since I do not have the schematics for them.

I'm planning to take a look at the plush 30A. Maybe all the plushes has the same hardware pinout?
May 09, 2012, 02:41 PM
Registered User
There might be a problem with ESCs that use FET drivers as they have a bootstrap capacitor that needs re-charging all the time?
May 09, 2012, 04:21 PM
Quad Whisperer
It will only be a problem when using an all-NFET ESC where the charge pump is driven by the half bridge's output. (HK F-20, F-30 and others).

Whether it uses a driver chip or not is not important.

It will be possible to use an all-NFET ESC if it has a separate charge pump, like the ginormous tower pro 40A heli.
May 09, 2012, 06:52 PM
hacker
You can get a bit of an idea about compatible hardware by looking at http://docs.google.com/spreadsheet/c...jU1YzdBQkZZRlE ... if they work with tgy.hex, they should be compatible.
May 09, 2012, 10:31 PM
If it flies, I will crash it
mxspode's Avatar
Another nice one Rolf. You are a clever boy.

Rob...
May 11, 2012, 05:31 AM
Quad Whisperer
Quote:
Originally Posted by simonk View Post
You can get a bit of an idea about compatible hardware by looking at http://docs.google.com/spreadsheet/c...jU1YzdBQkZZRlE ... if they work with tgy.hex, they should be compatible.
Good idea

Quote:
Originally Posted by mxspode View Post
Another nice one Rolf. You are a clever boy.

Rob...
May 11, 2012, 06:46 AM
Master of Flash
LazyZero's Avatar
Pretty cool project. I was looking for a brushed forward/backward ESC to reanimate a old RC fisher boat with Mabucchi 300 for my son. And was amazed to see that the market decreased dramatically. You only get some overpriced car ESC. I will test after vacations on a RedBrick 25A.

Best Christian
May 11, 2012, 06:35 PM
hacker
btw, if you want a crawler brushless ESC, you can enable RC_PULS_REVERSE in my tree and put it on any flight board

the real question is what can you do with the extra FET channel when using the brushless ESC board as a brushed ESC... dimmable headlights?
May 11, 2012, 07:13 PM
Quad Whisperer
I was thinking using the extra channel for back-up light.
May 14, 2012, 01:58 PM
FPV from Lithuania
vipix's Avatar
Can this software handle 490Hz PWM?
May 15, 2012, 04:29 PM
Quad Whisperer
Yes, no problem.


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