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Oct 07, 2012, 11:24 AM
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Discussion

Diy esc brushed for car


hello, esc brushed on http://homepages.paradise.net.nz/bhabbott/bridge.html
i use very good,but it is no brake,
i want diy esc brushed car with break
thanks you very much
Last edited by fantasy1988; Dec 02, 2016 at 09:28 AM.
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Oct 07, 2012, 11:34 AM
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.....
Last edited by fantasy1988; Dec 02, 2016 at 09:28 AM.
Oct 07, 2012, 08:48 PM
Registered User
hi,this is board esc brushed 7,2v
Last edited by fantasy1988; Oct 10, 2012 at 12:55 AM.
Oct 07, 2012, 09:19 PM
Registered User
i am use lm2576 bec 3a,and 6 fet 3205, pic 12f675,mc34063
very good but no brake.
Oct 08, 2012, 06:18 AM
We want... Information!
Bruce Abbott's Avatar
How do you want the brake to work?

1. Reverse throttle = Brake only.

2. First application of reverse throttle = Brake. Back to neutral and then reverse throttle again = Reverse.

3. Brake at neutral, reverse throttle = instant Reverse.
Oct 08, 2012, 07:01 AM
Registered User
thanks Bruce aboott
i want brake same esc brushed 320a car





2. First application of reverse throttle = Brake. Back to neutral and then reverse throttle again = Reverse.
Last edited by fantasy1988; Feb 13, 2017 at 09:24 AM.
Oct 08, 2012, 09:40 AM
Registered User
schematic esc brushed car no break
Oct 08, 2012, 04:05 PM
We want... Information!
Bruce Abbott's Avatar
It's just a firmware change, the circuit is the same.

NOTE: I have only tested it on a breadboard. Everything seems to work, but I can't guarantee that it's bug free!

Here's the asm source and hex file for a 12F675.
Oct 08, 2012, 06:08 PM
Registered User
Thanks, Bruce abbott
I will use the following and report the results
Oct 09, 2012, 01:59 AM
Registered User
Quote:
Originally Posted by Bruce Abbott View Post
How do you want the brake to work?

1. Reverse throttle = Brake only.

2. First application of reverse throttle = Brake. Back to neutral and then reverse throttle again = Reverse.

3. Brake at neutral, reverse throttle = instant Reverse.
Well, I am missing option
4. advanced sensing of rotation, where instant move to reverse throttle would proportionaly brake at limited brake force, and after it really stops, then goes reverse - gently to save gears. The same for transition from reverse to forward.
Because 1. is not applicable for car/ship, 2 needs hard to find center of throttle, and 3. would strip the gears instantly.
Oct 09, 2012, 02:21 AM
Registered User
Quote:
Originally Posted by coro View Post
Well, I am missing option
4. advanced sensing of rotation, where instant move to reverse throttle would proportionaly brake at limited brake force, and after it really stops, then goes reverse - gently to save gears. The same for transition from reverse to forward.
Because 1. is not applicable for car/ship, 2 needs hard to find center of throttle, and 3. would strip the gears instantly.
hello coro,
use the brake like esc 320A is very good, I almost completed the circuit like this esc, but I do not know the program change ASM 12F675
i will build esc for car 1/10 runs well
Oct 09, 2012, 02:33 AM
Registered User
My esc circuit has the following components

mc3406 create 20 volt activate sources fet h profile because I use a 7.2 V battery.
20 -7.2 to 12.8v the size of fet run well

LM2576 Creating 5 v 3a

opto lm 324 fet driver from chip 12f675

runs very well, but there is no compression braking is not perfect
Oct 24, 2012, 10:41 PM
Registered User

change PWM frequency in Bruce's PIC12F675 code


Hi Bruce,
I made an ESC with your PIC12F675 HEX and it is woking fine. The PWM frequency is around 2.7KHz. Is it possible to change the PWM frequency to around 600Hz, 300Hz or 70 Hz, some brushed motor works well under lower PWM frequency.

Sam
Oct 28, 2012, 06:46 AM
Registered User
hi bruce abbott
after a long time of check, circuit runs fine foward,reverse and brake, but I see the program appear some errors

1 pulse limit your program 1.8ms...........1.5ms.............1.2ms

if run forward too 1.8 or run reveser than 1.2 servo control pulse, the circuit automatically cut off, and set the initial state to the joystick in neutral position 1.5 This affects the speed when I'm playing
very difficult to adjust max 1.8ms and min 1.2ms of tranmiter 27mhz for car
So, if the pulse exceeds 1.8, or 1.2, motor max speed foward ,or max speed revese.,do not cut off

2 as txtchain said, 2.7khz frequency is relatively high, change down from 100Hz to 600Hz. some brushed motor works well under lower PWM frequency.
Last edited by fantasy1988; Feb 13, 2017 at 09:25 AM.
Oct 28, 2012, 09:46 PM
Registered User
we are looking forward to your early reply.
thank you bruce abott


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