Serin serout problem

[lerameur]

led on RC3,.. do not work

@ DEVICE PIC16F876A , HS_OSC , WDT_OFF , PWRT_ON , BOD_ON , LVP_OFF , PROTECT_OFF
'HS 20mhz, watchdog off, powerup timer on, mclr external, brown out detect on, low volt program off , code protect off

INCLUDE "modedefs.bas"

DEFINE LCD_DREG PORTC ' Set LCD Data port
DEFINE LCD_DBIT 4 ' Set starting Data bit (0 or 4) if 4-bit bus
DEFINE LCD_RSREG PORTB ' Set LCD Register Select port
DEFINE LCD_RSBIT 1 ' Set LCD Register Select bit
DEFINE LCD_EREG PORTB ' Set LCD Enable port
DEFINE LCD_EBIT 0 ' Set LCD Enable bit
DEFINE LCD_BITS 4 ' Set LCD bus size (4 or 8 bits)
DEFINE LCD_LINES 2 ' Set number of lines on LCD
DEFINE LCD_COMMANDUS 2500
DEFINE LCD_DATAUS 250
DEFINE CHAR_PACING 2000

TRISC =0

Pause 1000 ' Wait 1 second

loop:

lcdout $FE,1, "Number: ", dec 55
pause 100

portc.3=0
portc.3=1
pause 300
portc.3=0

goto loop

end

[lerameur]

even this do not work...
compiles and everything, but no action

@ DEVICE PIC16F876A , HS_OSC , WDT_OFF , PWRT_ON , BOD_ON , LVP_OFF , PROTECT_OFF
'HS 20mhz, watchdog off, powerup timer on, mclr external, brown out detect on, low volt program off , code protect off
DEFINE OSC 20
INCLUDE "modedefs.bas"
TRISC =0
loop:

portc.3=1 'Blink led
pause 300
portC.3=0
pause 300

goto loop

end

[skimask]

yes it does oscillate
when I put thisline:

@ DEVICE PIC16F876A , HS_OSC , WDT_OFF , PWRT_ON , BOD_ON , LVP_OFF , PROTECT_OFF

and not:
DEFINE OSC 20

DEFINE OSC 20 is for PBP and it's internal compiler and setting up various timing loops; it doesn't set any config bits anywhere in the PIC.

Leave both in there.

[lerameur]

then why doesn't the program in post 242 work ??

[skimask]

then why doesn't the program in post 242 work ??

osc running at ~20mhz?
are you using a crystal or one of those can oscillators?
all other things being equal, it's probably the programmer's fault (not you, I mean the actual hardware)

[lerameur]

i am using a crystal 20.0Mhz
programmer ? I have another one ...

[lerameur]

ok TRied the easy Prog Programmer,
http://www.embedinc.com/easyprog/index.htm
does not work more, same thing, I meam .. nothing is happening...

[skimask]

ok TRied the easy Prog Programmer,
http://www.embedinc.com/easyprog/index.htm
does not work more, same thing, I meam .. nothing is happening...

Just curious, is the chip a 16F876 or a 16F876A.... there's a difference as far as programming method goes...

[lerameur]

it is the 876A and 877A BOTH

[lerameur]

I also have te Pic18F4685, PBP do not have a file to compile this...
How do I go about making an Hex file out of it ??

[lerameur]

ok I am doing a remote control for my robot I wrote a code below, It seems long, Maybe you have a better idea. I am using two Potentiometer , the values of each will control the left and right motor of the robot:

'Remote control*****************

direction var word : speed var word

Loop:
If (left => 115) AND (left <= 135) AND (right => 115) AND (right <= 135) then
goto stop

If (left => 115) AND (left <= 135) AND (right <= 115) then 'left is stop, right is CCW
goto LeftstopRightCCW

If (left => 115) AND (left <= 135) AND (right => 135) then 'left is stop , right is CW
goto LeftstopRightCW

If (right => 115) AND (right <= 135) AND (right <= 115) then 'right is stop, left is CCW
goto RightstopLeftCCW

If (right => 115) AND (right <= 135) AND (right => 135) then 'right is stop , left is CW
goto RightstopLeftCW

If (left > 135) AND (right > 135) then 'Left Cw & right CW
goto LeftCWRightCW

If (left > 135) AND (right < 135) then 'Left CW & right CCW
goto LeftCWRightCCW

If (left < 135) AND (right > 135) then 'Left CCW & right CW
goto LeftCCWRightCW

If (left < 135) AND (right < 135) then 'Left CCW & right CCW
goto LeftCCWRightCCW

In brief:
'Stop '--------------------------------$69 = 01 10 10 01
'Leftwheel =stop : Rightwheel= CCW '--- $A6 = 10 10 01 10
'Leftwheel =stop : Rightwheel= CW '----- $96 = 10 01 01 10
'Leftwheel =CCW : Rightwheel= stop '---- $9a = 10 01 10 10
'Leftwheel =CW : Rightwheel= stop '----- $A5 = 10 10 01 01
'Leftwheel =CW : Rightwheel= CW '---- $66 = 01 10 01 10
'Leftwheel =CW : Rightwheel= CCW '---- $56 = 01 01 01 10
'Leftwheel =CCW : Rightwheel= CW '---- $5a = 01 01 10 10
'Leftwheel =CCW : Rightwheel= CCW '---- $65 = 01 10 01 01

[skimask]

I also have te Pic18F4685, PBP do not have a file to compile this...
How do I go about making an Hex file out of it ??

Upgrade to 2.47...

[skimask]

ok I am doing a remote control for my robot I wrote a code below, It seems long, Maybe you have a better idea. I am using two Potentiometer , the values of each will control the left and right motor of the robot:

'Remote control*****************

direction var word : speed var word

Loop:
If (left => 115) AND (left <= 135) AND (right => 115) AND (right <= 135) then
goto stop

If (left => 115) AND (left <= 135) AND (right <= 115) then 'left is stop, right is CCW
goto LeftstopRightCCW

If (left => 115) AND (left <= 135) AND (right => 135) then 'left is stop , right is CW
goto LeftstopRightCW

If (right => 115) AND (right <= 135) AND (right <= 115) then 'right is stop, left is CCW
goto RightstopLeftCCW

If (right => 115) AND (right <= 135) AND (right => 135) then 'right is stop , left is CW
goto RightstopLeftCW

If (left > 135) AND (right > 135) then 'Left Cw & right CW
goto LeftCWRightCW

If (left > 135) AND (right < 135) then 'Left CW & right CCW
goto LeftCWRightCCW

If (left < 135) AND (right > 135) then 'Left CCW & right CW
goto LeftCCWRightCW

If (left < 135) AND (right < 135) then 'Left CCW & right CCW
goto LeftCCWRightCCW

In brief:
'Stop '--------------------------------$69 = 01 10 10 01
'Leftwheel =stop : Rightwheel= CCW '--- $A6 = 10 10 01 10
'Leftwheel =stop : Rightwheel= CW '----- $96 = 10 01 01 10
'Leftwheel =CCW : Rightwheel= stop '---- $9a = 10 01 10 10
'Leftwheel =CW : Rightwheel= stop '----- $A5 = 10 10 01 01
'Leftwheel =CW : Rightwheel= CW '---- $66 = 01 10 01 10
'Leftwheel =CW : Rightwheel= CCW '---- $56 = 01 01 01 10
'Leftwheel =CCW : Rightwheel= CW '---- $5a = 01 01 10 10
'Leftwheel =CCW : Rightwheel= CCW '---- $65 = 01 10 01 01

You're right. There probably is a better/shorter way to do that.
I'll think about it for a bit and get back to ya.
I take it that the reason you've got 115 and 135 is for a bit of a 'deadband' so the thing doesn't jitter on you?

(see that?, the manchester encoding is handy isn't it?)

How about


'Remote control*****************

direction var word : speed var word
bits var byte
'bits = bit7 bit6 bit5 bit4 bit3 bit2 bit1 bit0
' LCW (-LCW) LCCW -(LCCW) RCW (-RCW) RCCW (-RCCW)
'use odd bits as a direction flag, use the even bits inverted from the others as the same thing, but also as a bit of error detection

TX end...

Loop:
bits = %01010101

If (left => 115) AND (left <= 135) then bits.7 = 0 : bits.6 = 1
if (right => 115) AND (right <= 135) then bits.3 = 0 : bits.2 = 1
if (right <= 115) then bits.1 = 1 : bits.0 = 0
If (right => 135) then bits.3 = 1 : bits.2 = 0
If (left <= 115) then bits.5 = 1 : bits.4 = 0
If (left => 135) then bits.7 = 1 : bits.6 = 0
transmit
goto loop


RX end....
In brief:
if bits.7 = bits.6 then bitserror 'bit pairs shouldn't be equal
if bits.5 = bits.4 then bitserror
if bits.3 = bits.2 then bitserror
if bits.1 = bits.0 then bitserror

'Stop '--------------------------------$69 = 01 10 10 01
'Leftwheel =stop : Rightwheel= CCW '--- $A6 = 10 10 01 10
'Leftwheel =stop : Rightwheel= CW '----- $96 = 10 01 01 10
'Leftwheel =CCW : Rightwheel= stop '---- $9a = 10 01 10 10
'Leftwheel =CW : Rightwheel= stop '----- $A5 = 10 10 01 01
'Leftwheel =CW : Rightwheel= CW '---- $66 = 01 10 01 10
'Leftwheel =CW : Rightwheel= CCW '---- $56 = 01 01 01 10
'Leftwheel =CCW : Rightwheel= CW '---- $5a = 01 01 10 10
'Leftwheel =CCW : Rightwheel= CCW '---- $65 = 01 10 01 01

And at the receiver end, the receiver code wouldn't actuate a motor until receiving a few correct codes in a row (a one time code wouldn't trip the motors into running).

Just a quick thought I had...

[lerameur]

I got the module working now, I will be doing some testing thursday.
by the way i wouls like to have a crystal oscillate by itself, How do i do that ? I have a sensor chip that needs to be clocked. I tried connecting it to + and ground but nothing

[skimask]

I got the module working now, I will be doing some testing thursday.
by the way i wouls like to have a crystal oscillate by itself, How do i do that ? I have a sensor chip that needs to be clocked. I tried connecting it to + and ground but nothing

Crystals don't oscillator by themselves. In short, you have to have a small inverting amp, induce a phase shift, and a few other things to get a usable signal from them. Grab the datasheet for a 4066 and see what they do with a crystal and one of those chips. Or just buy a DIP oscillator of the frequency of your choice (Digikey ECS oscillators).

[lerameur]

I got the oscillator goimg, Its square wave, I will be adding a couple of caps and resisor to make it more like a sin wave.

Also I needed more memory for my project so I got the monster Pic18F4685. Iuse the same program as for the Pic16F877a and it gives errors about the nbit number, I guess I have to change all the specification of my program. but I am not sure what; here is the message i am getting after compiling:

C:\PBP>pbp -p18F4685 motorG
PICBASIC PRO(TM) Compiler 2.47, (c) 1998, 2006 microEngineering Labs, Inc.
All Rights Reserved.
PM Assembler 4.08, Copyright (c) 1995, 2006 microEngineering Labs, Inc.
Error 18F4685.INC 14 : [235] Opcode Expected Instead of 'Error: PM does not sup
port this device. Use MPASM.'
Error C:\PBP\MOTORG.ASM 85 : [225] Undefined Symbol 'PORTB'
Error C:\PBP\MOTORG.ASM 86 : [225] Undefined Symbol 'PORTC'
Error C:\PBP\MOTORG.ASM 87 : [225] Undefined Symbol 'TRISB'
Error C:\PBP\MOTORG.ASM 88 : [225] Undefined Symbol 'TRISC'
Error PBPPIC18.LIB 161 : [225] Undefined Symbol 'PORTB'
Error PBPPIC18.LIB 379 : [225] Undefined Symbol 'PORTB'
Error PBPPIC18.LIB 1153 : [200] Instruction Restricted to 14-Bit Core
Error PBPPIC18.LIB 1153 : [218] Address Limit of FFFFh Exceeded
Error PBPPIC18.LIB 1158 : [200] Instruction Restricted to 14-Bit Core
Error PBPPIC18.LIB 1158 : [218] Address Limit of FFFFh Exceeded
Error PBPPIC18.LIB 1281 : [200] Instruction Restricted to 14-Bit Core
Error PBPPIC18.LIB 1281 : [218] Address Limit of FFFFh Exceeded
Error PBPPIC18.LIB 1282 : [200] Instruction Restricted to 14-Bit Core
Error PBPPIC18.LIB 1282 : [218] Address Limit of FFFFh Exceeded
Fatal PBPPIC18.LIB 1282 : [300] Too Many Errors

C:\PBP>

[skimask]

I got the oscillator goimg, Its square wave, I will be adding a couple of caps and resisor to make it more like a sin wave.

Also I needed more memory for my project so I got the monster Pic18F4685. Iuse the same program as for the Pic16F877a and it gives errors about the nbit number, I guess I have to change all the specification of my program. but I am not sure what; here is the message i am getting after compiling:

C:\PBP>pbp -p18F4685 motorG
PICBASIC PRO(TM) Compiler 2.47, (c) 1998, 2006 microEngineering Labs, Inc.
All Rights Reserved.
PM Assembler 4.08, Copyright (c) 1995, 2006 microEngineering Labs, Inc.
Error 18F4685.INC 14 : [235] Opcode Expected Instead of 'Error: PM does not sup
port this device. Use MPASM.'
Error C:\PBP\MOTORG.ASM 85 : [225] Undefined Symbol 'PORTB'
Error C:\PBP\MOTORG.ASM 86 : [225] Undefined Symbol 'PORTC'
Error C:\PBP\MOTORG.ASM 87 : [225] Undefined Symbol 'TRISB'
Error C:\PBP\MOTORG.ASM 88 : [225] Undefined Symbol 'TRISC'
Error PBPPIC18.LIB 161 : [225] Undefined Symbol 'PORTB'
Error PBPPIC18.LIB 379 : [225] Undefined Symbol 'PORTB'
Error PBPPIC18.LIB 1153 : [200] Instruction Restricted to 14-Bit Core
Error PBPPIC18.LIB 1153 : [218] Address Limit of FFFFh Exceeded
Error PBPPIC18.LIB 1158 : [200] Instruction Restricted to 14-Bit Core
Error PBPPIC18.LIB 1158 : [218] Address Limit of FFFFh Exceeded
Error PBPPIC18.LIB 1281 : [200] Instruction Restricted to 14-Bit Core
Error PBPPIC18.LIB 1281 : [218] Address Limit of FFFFh Exceeded
Error PBPPIC18.LIB 1282 : [200] Instruction Restricted to 14-Bit Core
Error PBPPIC18.LIB 1282 : [218] Address Limit of FFFFh Exceeded
Fatal PBPPIC18.LIB 1282 : [300] Too Many Errors

C:\PBP>

Check your PBP manual. You can't use the assembler that comes with PBP, gotta use MPASM for the PIC18Fxxxx parts.

[lerameur]

O ok, because i saw the .BAS and .INC files, so I thougt it would take it.
alright

[lerameur]

HI,
I am almost finish writing my code and I get an error at the receivring end, I have an LCDout and the sending end, it good number, but at the receiving end the information is confused.
meaning the Left is showing the same thing as the sending left.
But the right is showing me number like 12421 (pot at center). I encode and decode he same way, This is weird. what also struck me is that number 12421 is constant, so that when I move my pot there is a variation from 12542 to 12288 .
I also flipped the serin line for left and right and i get the same result..
(the sending and show number varying between 0 to 255)
here is a snippet of the code:

right var word : left var word : temp var word : counter var byte
rightold var word : leftold var word : speedright var word : speedleft var word
loop:
waitfor55:
serin portb.2 , n2400 , temp
if temp <> $55 then goto waitfor55

waitforaa:
serin portb.2 , n2400 , temp : if temp <> $aa then goto waitforaa

serin portb.2, n2400, rightold.LowBYTE : serin portb.2, n2400, rightold.HighBYTE
serin portb.2, n2400, leftold.LowBYTE : serin portb.2, n2400, leftold.HighBYTE

For counter=0 TO 7 'decoding
left.0[counter]=leftold.0[counter*2]
right.0[counter]=rightold.0[counter*2]
Next counter

Lcdout $fe, 1 'Clear screen
Lcdout "Left: ", Dec left
Lcdout $fe, $C0, "Right: ", DEC right
Pause 100

before you ask, here is my sending part:

send:
Lcdout $fe, 1 'Clear screen
Lcdout "Left: ", Dec left
Lcdout $fe, $C0, "Right: ", DEC right

serout portb.2, n2400,[$55,$55,$55,$55,$55,$55,$55,$55,$aa]

serout portb.2, n2400,[rightnew.LowBYTE,rightnew.HighBYTE]
serout portb.2, n2400,[leftnew.LowBYTE,leftnew.HighBYTE]

goto loop
end

[lerameur]

it works now, changed some word to byte ...

[lerameur]

Hey , I just realize that after running my receiving circuit for a minute or so , he Lm7805 gets very hot, Is this normal ?. on my sending circuit it stays cool.
I have on the receiving, an lcd, the receiving RF module, a Pic16F877a and an H-Bridge.. The H bridge is running directly from the battery for the Vs. everything is battery operated

[keithdoxey]

Hey , I just realize that after running my receiving circuit for a minute or so , he Lm7805 gets very hot, Is this normal ?. on my sending circuit it stays cool.
I have on the receiving, an lcd, the receiving RF module, a Pic16F877a and an H-Bridge.. The H bridge is running directly from the battery for the Vs. everything is battery operated

Does the LCD have a backlight ?

If so, try running it from the unregulated power supply after increasing the resistor accordingly.

[lerameur]

yes it does have a backlioght.
The supply is a 12v battery cannot put that directly on thebattery

[keithdoxey]

yes it does have a backlioght.
The supply is a 12v battery cannot put that directly on thebattery

Do you have a series resistor between your 5v supply and the LCD backlight?

If not it will be drawing excessive current which will definately be why the 7805 is cooking.

If you do have a resistor, then increase its value and drive the backlight from the 12v supply. Search for threads about "backlight", one just resurfaced in the last couple of days.

[lerameur]

i have a potenetiometer between the 5 v and the LCD, I swiched to the 12v with the pot, and the LCD is finished

[keithdoxey]

i have a potenetiometer between the 5 v and the LCD, I swiched to the 12v with the pot, and the LCD is finished

Sorry to hear that you toasted the LCD but I didnt suggest running the LCD from the 12v supply.... just the backlight.

If you had read the other threads about this you would see the reason behind it. The LCD only takes a couple of milliamps but the backlight takes 50-80mA which is a lot of extra for the regulator to handle.

The backlight doesnt need a regulated supply, just a current limited one hence the use of a series resistor which you calculate according to the forward voltage of the backlight , the required current through the backlight and the maximum voltage of the unregulated supply.

[lerameur]

a ok , i get it,
By the way , anybody knows why My h_bridge, L298N get really really hot even with a heat sink and just 1.8 amp ?and yes it is connected to the 12v battery. Getting hot, and its not working anymore...

[Archangel]

a ok , i get it,
By the way , anybody knows why My h_bridge, L298N get really really hot even with a heat sink and just 1.8 amp ?and yes it is connected to the 12v battery. Getting hot, and its not working anymore...

Hi Leramuer, sounds like the magic smoke escaped from that device. 12v x 1.8 a
= 21.6 watts, I assume thats the running current under normal load. That figure increases exponentialy when you reverse direction and that's a whole lot of heat. What do you have for a heat sink? Maybe in addition to more heat sink you should put in a thermal shutdown circuit.
JS

[skimask]

a ok , i get it,
By the way , anybody knows why My h_bridge, L298N get really really hot even with a heat sink and just 1.8 amp ?and yes it is connected to the 12v battery. Getting hot, and its not working anymore...

If it was me doing a project needing an H-bridge, I'd skip the H-bridge and just go with a set up using a bunch of logic-level N-channel enhancement mode MOSFETs (try saying that 3 times fast), or P-channel, whatever. That way I know for sure I can drive whatever it is I need to drive. And if the MOSFETs get too hot even after putting a heatsink on them, you can always parallel them. Which gets me to thinking...have you tried paralleling a couple of L298N's? I haven't read the datasheet, don't know if it's possible (or even wise)...might work though.

And 12v @ 1.8a does = 21.6watts, but only if the L298N has resistance across it, zero resistance = zero load. Maybe the L298N isn't being driven hard enough. (Sounds like it's time to get my butt over to the datasheets so I know what I'm talking about here).

[lerameur]

I have a big ass heat sink, about 9 times he size of the chip.
I believe I was under th wattage recommended (or maybe just on it, cause the battery was fully charged at 12.85 and @ 1.9 amp 24.7 watt.
would that of killed it.

I looked at comse circuit for making my own H-bridge, but is seems a bit messy.
I have some IRFZ44N N mos, maybe get their brother P's and work with that, you have any schematic ?
I found this: http://www.armory.com/~rstevew/Publi...d/nch-brdg.htm
but I dont know


update:
I tried one IRFZ44N , it become very hot with just 5watt. I know I can put a heat sink, but this thing is suppose to support 94 watt. Is there somehting I am not getting ??

[lerameur]

to go back to my LCD problem , I am not using backlight. I thought you where refering to the contrast adjustment. nothing is connected to th backlight supply. IS this ,my problem , From the other post you mentionned, The gentlemen did not have a problen and the backlight was not connected. Mine does.

[skimask]

I have a big ass heat sink, about 9 times he size of the chip.
I believe I was under th wattage recommended (or maybe just on it, cause the battery was fully charged at 12.85 and @ 1.9 amp 24.7 watt.
would that of killed it.

I looked at comse circuit for making my own H-bridge, but is seems a bit messy.
I have some IRFZ44N N mos, maybe get their brother P's and work with that, you have any schematic ?
I found this: http://www.armory.com/~rstevew/Publi...d/nch-brdg.htm
but I dont know


update:
I tried one IRFZ44N , it become very hot with just 5watt. I know I can put a heat sink, but this thing is suppose to support 94 watt. Is there somehting I am not getting ??

Well, like I said, the only way something can dissipate heat is if it has resistance in the first place, zero ohms across a device = zero volts dropped across it = zero watts dissipated in it. If that MOSFET is a standard MOSFET, and you're driving it with 5v, it isn't going to work very well. You need a logic level MOSFET, one that's designed to be driven with 5v. And monster heat sinks only work well up to a point. You can only get rid of so much heat so fast, they got limits too.
Why not post a schematic...we'll get a better idea of what you're up to. (on a side note, I haven't gotten over to the L298N datasheet yet).

[lerameur]

well eventually I would like to use 15v at 2 amps, so that h-bridge might to be ideal for now.
To follow your idea on using MOSfet, I found a web site talking about the IRF540, which is very similar to the one I have IRFZ44N., Except they use Pmos also, I guess I can use 4 Nmos and using an inverter instead of using 2 Nmos and 2 Pmos.

[lerameur]

what about driving one L298 per motor instead of two motors ?
will it be creating less heat ?

[Archangel]

I have a big ass heat sink, about 9 times he size of the chip.

Sounds good, how about some "B/A" bypass capacitors, or snubber diodes to protect those transistors, motors throw off some outrageous spikes which may well cause your bridge to get "Kentucky Fried".

what about driving one L298 per motor instead of two motors ?
will it be creating less heat ?

Always better, I think.

[skimask]

well eventually I would like to use 15v at 2 amps, so that h-bridge might to be ideal for now.
To follow your idea on using MOSfet, I found a web site talking about the IRF540, which is very similar to the one I have IRFZ44N., Except they use Pmos also, I guess I can use 4 Nmos and using an inverter instead of using 2 Nmos and 2 Pmos.

You got it, for the most part. In the end, you get 2 control lines, one for on/off, and one for direction. But, you will have to use 2 N's and 2 P's and an inverter (which you can also use a couple of small MOSFETs and a couple of resistors and make your own inverter from components rather than a 7404), N channel on top, P channel on bottom. Remember (in basic terms), N channel MOSFETs work by applying a ground to a circuit, P channel's apply power to the circuit.

And yes, some snubber caps and protection diodes, just in case. Motors are ugly in some ways...

[lerameur]

I put back the circuit together with one L298.
added caps, Its really hard to make them stick onto the motors, any thoughts?
Also it was not working at first, I realized that my Pic chip was not putting some pins at high. I changed the program so the pin output went from portC to portD and it worked. I reprogrammed the chip a few times, those couple of pins on PortC are not working no more. Can I revived them ? what happened..

[skimask]

I put back the circuit together with one L298.
added caps, Its really hard to make them stick onto the motors, any thoughts?
Also it was not working at first, I realized that my Pic chip was not putting some pins at high. I changed the program so the pin output went from portC to portD and it worked. I reprogrammed the chip a few times, those couple of pins on PortC are not working no more. Can I revived them ? what happened..

Post your circuit, otherwise it's hopeless...

[lerameur]

basically I am driving the h_bridge directly from microcontroller. Some one told me to use an opto coupler. BUt the output of the microcontroller is hooked up to the enable of the h-bridge, how can that fry my pins. I just fried my ccp pin..
Also, would it be better to use a seperate power supply for the controlelr and h-bridge?

[skimask]

basically I am driving the h_bridge directly from microcontroller. Some one told me to use an opto coupler. BUt the output of the microcontroller is hooked up to the enable of the h-bridge, how can that fry my pins. I just fried my ccp pin..
Also, would it be better to use a seperate power supply for the controlelr and h-bridge?

Like I said, post the circuit! We can hook you up with good info much quicker that way.