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Old Oct 07, 2012, 12:24 PM
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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,because i donot know write ASM for 12f675
help me diy esc brushed car with break
thanks you very much
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Old Oct 07, 2012, 12:34 PM
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help me
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Old Oct 07, 2012, 09:48 PM
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hi,this is board esc brushed 7,2v
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Last edited by fantasy1988; Oct 10, 2012 at 01:55 AM.
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Old Oct 07, 2012, 10:19 PM
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i am use lm2576 bec 3a,and 6 fet 3205, pic 12f675,mc34063
very good but no brake.
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Old Oct 08, 2012, 07:18 AM
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Bruce Abbott's Avatar
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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.
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Old Oct 08, 2012, 08:01 AM
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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.

you can write code Asm or C for 12f675 or 16f688 ? thank you very much
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Last edited by fantasy1988; Oct 08, 2012 at 08:11 AM.
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Old Oct 08, 2012, 10:40 AM
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schematic esc brushed car no break
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Old Oct 08, 2012, 05:05 PM
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Bruce Abbott's Avatar
Hastings, New Zealand
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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.
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Old Oct 08, 2012, 07:08 PM
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Thanks, Bruce abbott
I will use the following and report the results
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Old Oct 09, 2012, 02:59 AM
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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.
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Old Oct 09, 2012, 03:21 AM
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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
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Old Oct 09, 2012, 03:33 AM
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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
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Old Oct 24, 2012, 11:41 PM
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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
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Old Oct 28, 2012, 07:46 AM
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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.

thank you very much
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Last edited by fantasy1988; Oct 28, 2012 at 09:05 PM.
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Old Oct 28, 2012, 10:46 PM
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we are looking forward to your early reply.
thank you bruce abott
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