05-03 PWMFrequency
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Revision as of 20:54, 17 September 2014
This example program uses an analog input to control the period of a PWM.
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 | LED |
The following schematic can be used to build the circuit with a BAM210E or BAM210.
Schematic for example 05-03
/*Program Example 5.3: Uses analog input to control PWM period
*/
#include "mbed.h"
PwmOut pwm(PWM1);
AnalogIn Ain(A0);
int main() {
while(1){
pwm.period(Ain/10+0.001); // set PWM period
pwm=0.5; // set duty cycle
wait(0.5);
}
}
PWM1 was captured on the oscilloscope in the image below.
The following image shows the built circuit on a BAM210E.
