05-02 PWMPulse
From Manuals
This example uses an analog input to control the duty cycle of a PWM in a fixed period.
The signals used for this example are listed below:
| Signal | LPC4330 PIN NAME | BAM210E | BAM210 | BAM200E | BAM200 | Used for |
| A0 | P7_4 | J8-1 | J8-1 | S4-3 | S4-3 | Potentiometer |
| PWM1 | P1_7 | J9-3 | J9-3 | S2-3 | S2-3 | Oscilloscope |
The following schematic can be used to build the circuit with a BAM210E or BAM210.
Schematic for example 05-02
/*Program Example 5.2: Uses analog input to control PWM duty cycle, fixed period
*/
#include "mbed.h"
PwmOut pwm(PWM1);
AnalogIn Ain(A0); //defines analog input on A0
int main() {
while(1){
pwm.period(0.010); // set PWM period to 10 ms
pwm=Ain; //Analog in value becomes PWM duty, both are type float
wait(0.1);
}
}
PWM1 was captured on Channel 1 of the oscilloscope and AIN1 on channel 2 in the image below.
The following image shows the built circuit on a BAM210E.
