05-03 PWMFrequency
From Manuals
(Difference between revisions)
(Created page with 'This example program uses an analog input to control the period of a PWM. /*Program Example 5.3: Uses analog input to control PWM period …') |
|||
| (4 intermediate revisions not shown) | |||
| Line 1: | Line 1: | ||
This example program uses an analog input to control the period of a PWM. | This example program uses an analog input to control the period of a PWM. | ||
| + | The signals used for this example are listed below: | ||
| + | {| border="1" cellpadding="5" cellspacing="2" align="center" style="text-align: center;" | ||
| + | |+ align="bottom"|'''Signals Used and Connector Locations for Example 05-03''' | ||
| + | |'''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. | ||
| + | [[Image:BAM210_05_03_SCH.png|center|alt=BAM210|frame|<div align="center">'''Schematic for example 05-03''']] | ||
| + | |||
| + | <div style="text-align: left;"> | ||
/*Program Example 5.3: Uses analog input to control PWM period | /*Program Example 5.3: Uses analog input to control PWM period | ||
*/ | */ | ||
| Line 15: | Line 48: | ||
} | } | ||
| - | [[Image: | + | PWM1 was captured on Channel 1 of the oscilloscope and AIN1 on channel 2 in the image below. |
| + | [[Image:BAM210_05_03.png|center|]] | ||
| - | + | The following image shows the built circuit on a BAM210E. | |
| - | [[Image: | + | [[Image:BAM210_PWMPulse.jpeg|center|]] |
Current revision as of 14:48, 18 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 Channel 1 of the oscilloscope and AIN1 on channel 2 in the image below.
The following image shows the built circuit on a BAM210E.
