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        Cool DIY Brushless Speed Control

#1 zagisrule! Dec 22, 2003 11:45 AM

DIY Brushless Speed Control
Hi Everybody,

I know there are alot of people out there that want a BL design that they can build to play around with. I think it is time we fill that desire and get some out there!

I think we should all throw around ideas and get this done. I have the ability to do *some* PIC programming, hardware design, PCB design, schematic capture and drawing, and have a few ideas how we can get this done. I can also build and test designs. I have PIC and AVR programming equipment too. If we pool together our knowlege I have no doubt that we can get this done.

What does everyone think? I am aware that there is a thread in the "Indoor and Micro Flight" forum, but that thread seems to be aimed at producing a specialized control that is for use on some of the home-brew motors they are making. I am also aware of Takao Shimizu's free design and some of the other German designs that are not "free." I think that the design that we do should be free for everyone that wants it, I am tired of seeing designs that you have to pay for.

Good idea?


#2 mmormota Dec 22, 2003 02:06 PM

I think that the firmware for the controller is rather complicated. It is not only routine, needs a lot of ideas, trial-error efforts and a lot of work.

Developing a good firmware and publishing it for free would be a really great gift to the community.

Takao published a new circuit diagram, it is elegant, simple, practical. As he wrote, the firmware is already working, but the receiver interface part is not ready. If he will be so kind to publish it too, then the job is easy, we need only slight modifications for different power levels, different cutoff voltages etc.

#3 soren Dec 22, 2003 03:53 PM


If you want to build your own controllers - look here:


These are super controllers !!!
I have build - and are flying - more than 25 of these controllers....
Jo, that make the program for these controllers is a wise man......

Good luck


#4 zagisrule! Dec 22, 2003 04:11 PM

Where might I find Takao's new schematic?

I am impressed that Takao is so generous as to share his designs so freely.

Speedy-BL designs are only available for purchase, right? I am confused as to whether or not they are free or not.


#5 Ron van Sommeren Dec 22, 2003 05:01 PM

Matt, the Speedy BL design is free. You can buy it as a kit. You've probably seen these links, six diy brushless ESC designs, including Takao Shimizu's design:

Met vriendelijke groet ;) Ron van Sommeren
diy outrunner brushless e-motor discussion.
Electric fly-in & lrk meet, June 27th, 2004, Nijmegen, the Netherlands.

#6 mmormota Dec 22, 2003 05:34 PM


Matt, the Speedy BL design is free. You can buy it as a kit.
Are you sure it is free? Schematics? Code to burn in? I didn't found them.

#7 mmormota Dec 22, 2003 05:45 PM


Where might I find Takao's new schematic?

I am impressed that Takao is so generous as to share his designs so freely.
He published it in the One hour CDRom... #2 topic:


#8 zagisrule! Dec 22, 2003 08:20 PM

Looks great! It will be possible to build that design very small, because it eliminates the quad op-amp that the previous version used.


#9 PDK Dec 22, 2003 09:53 PM


Sounds like a good idea to me. I would love to help. Unfortunatly I am not much help on the technical side. I can swing a soldering iron and make a pcb though.

I will follow this thread closely.

Good luck

#10 hadihf Jan 15, 2004 01:51 AM

A DIY Controller...
1 Attachment(s)
Any feedback and comments???

#11 mmormota Jan 15, 2004 06:38 AM

The pcb nice and small. Please give some details...

#12 hadihf Jan 15, 2004 07:46 AM

DIY Controller Schematic
1 Attachment(s)
It is at www.bldc.de but is poor quality...I have redrawn it more clearly. The source is also posted at this site but you need to register first.


#13 hadihf Jan 15, 2004 07:50 AM

DIY Controller
1 Attachment(s)
Here is PCB top...:)

#14 mmormota Jan 15, 2004 08:48 AM

Thank you for the fast reply.
This is a free design?
The code is available too?
How can I register there? (I can't speak German)

How is it working?

#15 whanderson Jan 15, 2004 09:17 AM

Free, open, and registration free schematics, source code, and design info (all written in English) is at:

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