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Old 12-19-2020, 11:56 AM   #1
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Default Silent outrunner and ESC for less then $60

Updated: Jan/08/2021

Here is a video I made you can watch too, it also talks about using a flight controller to update and configure the firmware. It is where you would set your motor KV and change the startup power.

Basically you can skip some of the more complicated things and do it all with just the STM32CubeProgrammer with 4wires, and the flight controller using the receiver plug and a battery.

I am basically copying these instructions from my PDF file I shared earlier in a few places. I will try to keep this post updated but if not all the files in my google drive will be the most recent.

This motor HobbyStar 2820 (3542) Brushless Outrunner Motor 1450KV

works pretty good, the big downside is the 5mm shaft. so you need a 5mm pinion.
Holmes Hobbies, and Team Brood both have a wide variety of outrunners with 1/8th pinion shafts but they cost quite a bit more too.


How to program a Airbot wraith32 35A v1 ESC to run the Holmes Hobbies Revolver 1400kv or 1000kv silently.
First off a huge credit goes out to AlkaM from https://www.rcgroups.com/forums/member.php?u=696658 who Designed this firmware, and continues to update and improve it. I am actually older firmware here because I can’t figure the new stuff out yet.
Also Thank You to those who posted in his forums who have preceded me: MadMax, MGeo, possibly others…
The main purpose of this tutorial is to run a Holmes Hobbies Revolver with out all that noise. Other outrunner motors will probably work fine as well. I have only tested this with the 1400kv stubby revolver, and I have heard the 1800kv or higher will suffer in performance. I don’t know why, something to do with loosing torque.
The firmware I am using at the time of writing this does not have the greatest drag brake. I think its just a setting I need to find but… I haven’t found it yet… I’m hoping some one else will make me a nice firmware.bin file I had a different esc earlier that preformed better from a different version of the same opensource firmware and it ran great IMO.
I will not be covering compiling the firmware in depth, but I am using AlkaM’s firmware from here https://github.com/AlkaMotors/AM32-M...r-ESC-firmware and the target used for the wraith is MP6531. When you import it into STM32CubeIDE the project is called F051_II_bi_dir. That’s the quick version… That’s all you get…
Note, I have only tested this with the Airbot wraith32 35A v1, the Airbot wraith32 35A v1 and the 50A Airbot wraith32 Plus.
Step 1: Gather your supplies
You’re going to need a table… and an esc (probably this specific ESC), and a ST-link v2 programmer with jumper wires, a BEC or BUCK converter (to power the servo and reciever), a prototyping breadboard, soldering Iron with a small tip, wires, non acid flux, and a Windows 10 computer.
Recommended optional supplies –a magnifying glass, or a good zoom for your camera (because this crap is tiny!) I use open camera (for android) because it doesn’t fall asleep.


Step 2: Soldering- Part1
We need some tiny wire, I use stranded silicone 22awg wire. Solder wires to SWD (SWDIO), SWC (SWCLK), PWM, + (POS, main positive power in for ESC) and - (GND, main negative power in for ESC).

Plug the Wires into the breadboard, make sure they all have different numbers (same numbers are connected to each other).
Tip: solder short solid wires to the main inputs and outputs to hold the esc to the breadboard. Note I have PWM and +(POS) in different rows. Same for the middle power out wire to the motor (not shown). Also those 2 red and blue wires touching and the white one behind them are no longer used, so ignore them.
Tip: Run Jumper wires to a location on the breadboard that matches the order on your ST-link.
Note to self: consider updating this picture.

Step 3: Download and install Software

STM32CubeProgrammer
We need this to disable write protection on the Option bytes, and to load the firmware. https://www.st.com/en/development-to...l#get-software
I think you need to register or something, but it's free, no credit card, just an annoyance.
Step 4: Connect ST-programmer
Relatively straight forward, make sure you got your wires in the right locations.
4 wires connect to the ST-Link, SWD (SWDIO), SWC (SWCLK), + (POS, 5.0v) and - (GND).
I generally use 5.0v for power, I had issues with 3.3v
Check your wires again, seriously, just do it! Especially the power wire.
Connect the ST-Link to your computer.
(Removed) Step 5: Unlocking something w/ OpenOCD
I am not 100% sure this step is necessary but were doing it because we went through a lot of work installing the software for it already.

Turns out it wasn't necessary...

Step 6: STM32CubeProgrammer

With your ESC and ST-Link connected open STM32CubeProgrammer and click the green connect button in the upper right corner.
1.Click on OB (Option bytes)
2.Select “Read Out Protection” and Set to AA
3.Select “Write Protection” and check all the empty boxes, scroll through, get them all and clickapply.
4.Now do a full chip memory erase

Oh I never told you to download the firmware.bin file… You also will need the interwebs, you probably have that if your made it this far, and the table is probably optional… Download the wraith_crawler_full_x.xx.bin file from (It is just a .bin file It could be called anything.bin) https://drive.google.com/drive/folde...cL?usp=sharing
5.Select Erasing & Programming from the left
6.Browse for the firmware you just downloaded
7.Set the start address to 0x08000000 if it isn’t already
Info: if you have already uploaded a full file you can upload a part file at 0x08008000, the part files do not contain the bootloader. Part files are better uploaded from the configurator though.
8.Check the verify programming box if it isn’t already
9.And start programming (we are not going to do actual programming, were just loading somefirmware, get a hold of yourself man!)

Step 7: Optional Testing
This probably shouldn’t be optional, but I don’t feel like explaining how to connect all your receivers, motors and batteries to the breadboard. I mean really if you made it this far, consider your self a pro! You can do this!
Step 8: Unsolder and Resolder
Unsolder all these wires and pins
As usual you need to solder the positive and negative battery leads on the 2 tab side.
The motor wires go to the 3 tab side (if the motor is going the wrong direction swap any 2 of these wires)
This esc was not designed to power a servo, so only run the ground and PWM to your receiver
Connect all this to your RC car
That’s about it…
If everthing went acording to plan, you should end up with something that looks like this.

Last edited by Voodoobrew; 01-08-2021 at 01:37 AM.
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Old 12-19-2020, 12:08 PM   #2
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Default Re: Silent outrunner and ESC for less then $60

This video shows the approximate performance of the setup, I will upload a video of this exact setup as soon as I can, but the firmware is the same, just slightly different hardware. Should be able to do it this week some time.

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Old 12-19-2020, 12:16 PM   #3
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Default Re: Silent outrunner and ESC for less then $60

Quote:
Originally Posted by Voodoobrew View Post
If everthing went acording to plan, you should end up with something that looks like this.[/COLOR][/SIZE]

That is like some rigs look like even with a brushed setup
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Old 12-28-2020, 02:09 PM   #4
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Thumbs up Re: Silent outrunner and ESC for less then $60

That is one very slow and quiet combo. How is the drag brake? Have you had a chance to put it through its paces yet?
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Old 12-29-2020, 11:45 AM   #5
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Default Re: Silent outrunner and ESC for less then $60

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Originally Posted by Motorider View Post
That is one very slow and quiet combo. How is the drag brake? Have you had a chance to put it through its paces yet?
The active drag brake is pretty good, the regular drag brake seems a bit weaker then my crawlmaster pro 550 but not by much. Its pretty close to holding this truck on a 60 degree incline.
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Old 12-29-2020, 12:06 PM   #6
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Default Re: Silent outrunner and ESC for less then $60

Awesome thread! I may have to tinker with this at some point.
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Old 12-30-2020, 06:57 PM   #7
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Default Re: Silent outrunner and ESC for less then $60

Here is a video of a 55a wraith and the $25 motor. I have it geared at 56:1 which is about the same as an scx10ii with a 10t pinion.

This is what you can expect from the current firmware for cheap

If your wires aren't a wreck like this you did it wrong...

Last edited by Voodoobrew; 12-30-2020 at 07:00 PM.
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Old 12-31-2020, 03:40 AM   #8
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Default Re: Silent outrunner and ESC for less then $60

Me likey��
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Old 12-31-2020, 05:22 AM   #9
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Default Re: Silent outrunner and ESC for less then $60

Very nice, i cant find any fault on this combo, once the esc is already built that is..super cool
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Old 12-31-2020, 06:35 AM   #10
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Default Re: Silent outrunner and ESC for less then $60

Oh man this is too cool.
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Old 12-31-2020, 09:10 AM   #11
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Default Re: Silent outrunner and ESC for less then $60

Quote:
Originally Posted by cartronicshn View Post
Very nice, i cant find any fault on this combo, once the esc is already built that is..super cool
This esc is mostly unrelated to the Holmes Hobbies esc if that's what you are referring to. It's open source firmware on an off the shelf esc.

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Old 12-31-2020, 12:38 PM   #12
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Default Re: Silent outrunner and ESC for less then $60

I updated the Dixie Horn to sound close the the original
https://youtu.be/XHcDa8yTEbI
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Old 01-03-2021, 06:29 PM   #13
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Default Re: Silent outrunner and ESC for less then $60

Ever run one of your outrunners on a tekin esc? When I swapped my tekin esc out for a castle, it got a whole lot louder. Just curious if the outrunner would be quiter on a tekin. (I don't own any outrunners to test).

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Old 01-04-2021, 05:32 AM   #14
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Default Re: Silent outrunner and ESC for less then $60

I don't have any tekin. Their esc's are over 10x the price of these so there is zero chance I will be purchasing one to find out. $15 vs $200 esc. Can the tekin lay golden eggs? I get buying nice things. But honestly I have as much fun shopping and fiddling with rc as I do driving them. Tekin limits the amount of shopping I can do...

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Old 01-06-2021, 03:55 PM   #15
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Default Re: Silent outrunner and ESC for less then $60

So here are 2 Videos using the stock BLHeli32 Firmware so you can see, the Wraith32 or other Quadcopter ESC's aren't terrible ESC's if you don't want to go through the work of reprograming them.

Youtube - Wraith32 35A Stock Firmware


Youtube - Overpriced Crawler ESC Rant
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Old 01-25-2021, 06:41 PM   #16
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Default Re: Silent outrunner and ESC for less then $60

Update: I got some IFlight 50A Sussex ESC's they take different firmware but they work just as good as the wraiths. But only $18 for the 50A version. There is also an 80A version that would work the same, but I have not tested it.
I put the needed firmware on the google drive.
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Old 02-12-2021, 10:43 AM   #17
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Default Re: Silent outrunner and ESC for less then $60

I have ordered one of these ESC to give it a shot.
My main concern is the programing. Still have to order one of those ST-Link. A cheap one from ebay is enough?
I will be trying it on a bit higher Kv Outrunner (2200kv), lets see how it will work...

Thank you for all the work you've put in to this!
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Old 02-14-2021, 05:23 AM   #18
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Yea, just the cheap ST-Link from ebay is what I use.
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Old 02-20-2021, 09:52 AM   #19
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Default Re: Silent outrunner and ESC for less then $60

I have done everything to program the esc and it all looks good. When I plug in a battery it comes on for a short moment, chimes, and powers off. Can you help me please?
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Old 02-21-2021, 10:58 AM   #20
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Default Re: Silent outrunner and ESC for less then $60

Decided to take a second whack at this. Thank you much for sharing all the files and this tutorial.

This time seems to be more successful than last time. I get the dixie tune on start up but nothing beyond that. Thinking I fried the esc at some point? Never smelled like burning and never got any magic smoke though. The only sign of a fried esc is the indicator LEDs light up real bright when battery is first plugged in then fade like a cap going. But it will do this everytime I plug in.

Thanks much for the help in advance. Really would like to get the two escs Ive been tinkering with going.
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