8 years, 5 months ago.  This question has been closed. Reason: Off Topic

QEI.h on LPC1768

Hello guys!

I've learned about QEI and l've tried to check encoder pulses using QEI.h file

Even though my encoder pulses per revolution is 1200, I've just got only 600 pulses per one revolution.

I'm just wondering why I didn't get the 1200 pulses... I just think I've still got X2_ENCODER value not X4_ENCODER value.

So could you check my code and tell me why haven't I got the right values?

Thanks.

Charlie.

---- code-----

1. include "QEI.h"

1. include "mbed.h"

AnalogIn ain(p20);

PwmOut INA(p21); InputA(Clockwise rotating)

PwmOut INB(p23); InputB(Counterclockwise rotating)

PwmOut PWM(p22); pwm outputs

Serial pc(USBTX,USBRX); tx,rx

QEI Wheel(p13, p14, NC, 1200, QEI::X4_ENCODING);

/* Function prototype */

void motorControl(bool dir, float pwmVal);

int main()

{

int data;

while(1)

{

float i; PWMduty

i = ain;

data = ain *100;

motorControl(1,i); Clockwise rotating

pc.printf("Pulses is: %d PWMduty : %d %% \n\r",Wheel.getPulses(),data);

wait_ms(100);

}

}

This is a motor control function which controls

the speed and direction of a motor

void motorControl(bool dir, float pwmVal)

{

PWM.write(0); Duty cycles are initially zero

PWM.period_ms(1);

if(dir==1) forward direction

{

INA.write(1);

INB.write(0);

PWM.write(pwmVal);

}

else if(dir==0) reverse direction

{

INA.write(0);

INB.write(1);

PWM.write(pwmVal);

}

}