Gd day to all,
I’m trying to install a brushless system on a 1/24 slot car.
My main problem is to modify esc setting in order to turn off the radio signal.
I have checked blheli suite but it doesn't offer such option.
Is there any chance to access to such funtion with arduino uno?
Tnks n best rgds
Max
The ESC is unlikely to support such functionality as it expects a 50Hz PWM input signal. You could consider using an Arduino to convert the voltage from the track into a 50Hz PWM signal to feed the ESC, but of course, a Uno would not fit in the car so you would need to consider an alternative
The UNO might not fit, but another Arduino board would easily, and the ESC.
It's been some time, never mind how long precisely, since my slot cars days. Please give us an idea of what you have available in the car while racing.
What voltage and how is throttle setting delivered to the car?
I look forward to googling a few keywords you might supply as to the current standards and state of the art.
This sounds very possible to do and kinda fun. The Arduino may even be able to synthesize modern control protocols for the ESC, which in this case might or might not give the same advantages.
How big is the car? I took a stab and figure it's 20 cm long?
You could certainly do some proof of concept experiments with the UNO if you don't wanna invest in a smaller format board.
a7
I think this can be done without Arduino.
Get the tiniest servo tester you can find, something like this: Mini servo tester pwm digital display pulse width frequency displayer with 3v to 8v light indicator Sale - Banggood.com-arrival notice-arrival notice
Turn it all the way up and connect to the ESC. So now the ESC will always be set to maximum speed. Now you control the power with your regular slot car controller, and the ESC will follow.
Something like this?
*Edit - this might not work as an ESC calibrates the throttle range in the same way.
Hi,
How do you aim to change the speed of the BLDC motor?
Just changing the supply voltage will not result in any or very little reliable speed control.
Have you tried this before mounting it in a car?
Can you please post a schematic of how you will connect it into a car?
Can you please post specs/data on the motor and ESC?
Thanks.. Tom... 
ciao to all, and tnks for your kind replay.
Some guys have hacked the firmware of Castle Creation Talon25 esc, and they modifyed the firmware turning off the throttle pwm pulse setting it always turned on, so as soon as
you apply a tension on the track braid the motor is starting to spin.
But this method at the time being is working only with talon25, i was wondering if it is possible trought arduino board read any esc firmware and then try to modify it.
Answered your own question!
We also still curious about what is delivered to the car on the track, power and data.
Too bad I'm too lazy to google. Hint @libeccio…
a7
if you are able to turn off the pwm input and set it always open, as soon as you apply any voltage to the track braid the motor will start spin.
here a youtube video link Brushless Slot Car Racing - YouTube
Hi,
So how is speed controlled, have they done more hacking than just bypassing the PWM input?
If you vary the slot voltage to control speed, is it a PWM controlled current or analog controlled current?
I gather what you want to do is;
Place an Arduino in the car to provide the PWM control signal to the ESC.
You will need to provide some sort of regulated supply to the Arduino so it is running with 5V or 3V3 supply as you wind up the slot current.
The Arduino then reads the slot voltage, which is possibly proportional to required speed and converts that to a PWM speed signal for the ESC.
You may have to have a Lipo on board and run a low current type Arduino based controller, even a ATtiny might be able to do the job.
Tom...
It's 2022. I suspicion that this is no longer how slot cars work.
Suspicion and hope. 
a7
Not really sure how well an ESC would work with a varying voltage, normally with an on-board speed control you would want to run full voltage on the track and vary the speed by sending a data signal over the track voltage (similar to the DCC system used for model trains).
Well someone has to ask the hard questions, rather than assume.
Tom...
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