arduino motor shield

i have arduino uno , motor shield connected it. have connected 2 dc motors (those yellow ones arduino car) when put in code turn on motors @ speed works when put commands in if function motors don't work except on pwm 255
here code i'm not professional in can revise
sorry new topic i'm in bit hurry
#include <irremote.h>
#include <servo.h>
#include<wire.h>
int recv_pin = 2;
irrecv irrecv(recv_pin);
decode_results results;
void setup()
{
irrecv.enableirin();

 
  //setup channel a
  pinmode(12, output); //initiates motor channel pin
  pinmode(9, output); //initiates brake channel pin
  //setup channel b
 
  pinmode(13, output); //initiates motor channel pin
  pinmode(8, output);  //initiates brake channel pin
pinmode(11, output);
pinmode(3, output);
serial.begin(9600);

}
void loop() {
if (irrecv.decode(&results)) {
irrecv.resume();
if (results.value == 0xec27d43d){ // type remote forward robot control button hex value in underlined area.

  //motor forward @ full speed
  digitalwrite(12, high); //establishes forward direction of channel a
  digitalwrite(9, low);   //disengage brake channel a
  analogwrite(11, 255);   //spins motor on channel @ full speed

  //motor b backward @ half speed
  digitalwrite(13, high);  //establishes backward direction of channel b
  digitalwrite(8, low);   //disengage brake channel b
  analogwrite(3, 123);    //spins motor on channel b @ half speed
serial.print("naprijed");
 
 

 
 }


else if(results.value == 0x1a422e43){ // type remote left robot control button hex value in underlined area.

digitalwrite(12,high);
digitalwrite(9,low);
analogwrite(3, 123);

serial.print("lijevo");

}

else if(results.value == 0xa23bd824){ // type remote right robot control button hex value in underlined area.


digitalwrite(13,high);
digitalwrite(8,low);
analogwrite(11, 123);
serial.print("desno");

} else if(results.value == 0x86bd99c){ // type remote backward robot control button hex value in underlined area.

digitalwrite(12,low);
digitalwrite(9,low);
digitalwrite(13,low);
digitalwrite(8,low);
digitalwrite(11, 123);
analogwrite(3, 123);
serial.print("natrag");
}
else if(results.value == 0x7295a904){ // type remote stop robot control button hex value in underlined area.

digitalwrite(12,low);
digitalwrite(9,high);
digitalwrite(13,low);
analogwrite(8,high);
serial.print("stop");

}

}

}

your code hard understand. if used names instead of numbers pins:

code: [select]

// arduino motor shield pins
//  channel a: left motor
const int leftbrakepin = 9;  // set low move
const int leftdirectionpin = 12;
const int leftpwmpin = 3;
//  channel b: right motor
const int rightbrakepin = 8;  // set low move
const int rightdirectionpin = 13;
const int rightpwmpin = 11;

always use digitalwrite() brake , direction pins.
always use analogwrite() pwm pins.
don't use "high" , "low" analogwrite().  high 1 mean "very slow".

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