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motor and pic 16f877

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kotsam

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00857a.pdf

i was trying to program dc motors by using h-bridge chip but i didnt success to do it , so please if anybody can send to me the program to find out my mistakes i will be so pleased or to tell me how can i program it, (i'm using assembly not c)

thank you all
 

you may use this link for reference:
**broken link removed**
 

Thank you for quick response
But I’m not using sensors in my program; I would like the motor to go forward and reverse by using h-bridge, and the to produce PWM from the PIC because I didn’t without producing PWM but if I’m not using PWM I can’t control the speed.
 

What is your H-bridge chip?
 

that's my h-bridge : LMD18200
 

Simplest way:
generate periodic interrupt with timer. t1+t2
on interrupt:
increment counter
)compare with set t1 period
if lower contiue ,in not change output state and if is t1+t2 reset counter=0
for controll use 2 pins
in one direction one pin is fixed ti lo(hi) other is pwm in reverse second pin is fixed
first is pwm.
I have assembly file but comments is in macedonian and i can send to You.
 

    K

    kotsam

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to ace1903:

thanks very much and please send the assembly to me i don't worry about the comments becuase i will understand the program from the instruction
 

hi all
i have the same problem and i need todo what kotsam wants to make i'm using the h-bridge l6203 and microcontroller pic16f877 but i'm using c language and the motor rating is 4 A 30 V would anybody send me a scematic of the circuit and the program.

i have made the circuit and the program and it works fine when driving the h bridge non pulsed as a signal from the microcontroller but when i pulse drive it the motor goes crazy and produces noise so i have the feeling that there is something wrong with either.

i have been stuck with this problem for about 2 month. please help me guys
 

hi all
guys i need help with my above problem please help,

thanks
 

hi,
If you heard sound from motor, maybe your pwm frequency is too low.
try to increase it
bye
 

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