Diy esc brushed for car - Page 3 - RC Groups
 Nov 07, 2012, 05:49 AM Registered User I think, with the mixed signal pulse diagrams, circuit works just fine for the tank but not suitable for boat  with the boat, turn left or turn right, only one in two motor activities  with tanks, turn left or turn right, two motor will turn in the opposite direction tanks work with 2 bridge H (use 2 motor ) boat work with 3/2 bridge H (use 2 motor )
Nov 07, 2012, 07:08 PM
Registered User
Quote:
 Originally Posted by rc my life  with the boat, turn left or turn right, only one in two motor activities  with tanks, turn left or turn right, two motor will turn in the opposite direction tanks work with 2 bridge H (use 2 motor ) boat work with 3/2 bridge H (use 2 motor )
I think both works the same
 Nov 08, 2012, 10:57 PM Registered User when the boat is running high speed, if you want to change the direction (mixed signal as diagrams), two motor will spin in opposite directions. and the boat will turn 180 degrees. the result is flipping boat if you want to run two motor boats, you need to install the feature mix the signals site built circuit control two motor for boats, http://julnet.ch/index.php?option=co...iques&Itemid=2 and this is the most perfect motor control circuit, but it is very difficult to implement http://evei.ru/?p=1623 install software Last edited by rc my life; Nov 09, 2012 at 12:27 AM.
 Nov 10, 2012, 12:04 AM Registered User hi ?
 Nov 10, 2012, 12:06 AM Registered User sites you recommend, it is complex and expensive. for me, just pic is enough thank you
 Nov 11, 2012, 12:40 AM Registered User it is your choice, design of bruce Abbott is enough.
 Nov 12, 2012, 10:16 AM Registered User hi bruce abbot I wonder about the brakes for motor mode, the short-circuit method two fet low (connected to GND) braking force depends on the internal resistance of the FET? Small Ohm resistor, braking sharply. large resistor Ohm, weak brakes?  any other factors?
Nov 12, 2012, 06:46 PM
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Quote:
 Originally Posted by future88 braking force depends on the internal resistance of the FET?
Lower FET resistance will improve braking force, but normally it is much lower that the internal resistance of the motor, so the effect should be small.

Here is the latest version of my code, with Timer1 gate used to capture the incoming servo pulse (giving a smoother throttle with less jitter). Turns out the reason I was having trouble getting this to work was that MPLAB Sim doesn't properly simulate the Timer1 gate when it is steered to GP3. My code works fine in an actual device, but the simulated timer wouldn't count!

NOTE: as with the previous version, this HEX file was assembled in 'simulate' mode, so low voltage cutoff and throttle arming are disabled.
 Nov 13, 2012, 08:18 PM Registered User thanks bruce abbot I connect pin 6 to pin 1, because low voltage cutoff mode only works well with the small motor. but for large motor, when it works, it significantly reduced volt battery, so pic cut off power we can use this device to take on the job for the pic, and the pic will work less new version using 12f617, as you said low voltage cutoff mode disabled. so why not use pin 6 to display a LED. LED is turned on in regime forward, reverse or brake., and blinks when the pulse signal loss? of course, this is just my comments , for a more complete version,
Nov 14, 2012, 05:24 PM
We want... Information!
Quote:
 Originally Posted by future88 new version using 12f617, as you said low voltage cutoff mode disabled. so why not use pin 6 to display a LED. LED is turned on in regime forward, reverse or brake., and blinks when the pulse signal loss?
Good idea!

Since the high-side outputs already reflect which direction the motor is going, I simply connected the forward and reverse LEDs to pins 3 and 7. I used pin 6 to turn on the brake LED. On loss of signal the brake LED flashes rapidly.