11 years, 2 months ago.

Led Brightness control program - class doubts

host terminal LED dimmer control

1. include "mbed.h"

Serial pc(USBTX, USBRX); tx, rx

PwmOut led(LED1);

float brightness=0.0;

int main() { pc.printf(“Control of LED dimmer by host terminal\n\r");

pc.printf("Press 'u‘ = brighter, 'd‘ = dimmer\n\r");

while(1) {

char c = pc.getc();

wait(0.001);

if((c == 'u') && (brightness < 0.1))

{ brightness += 0.001; led = brightness; }

if((c == 'd') && (brightness > 0.0))

{ brightness -= 0.001; led = brightness; }

pc.printf("%c %1.3f \n \r",c,brightness); } }

Here in this program how does "float brightness" gets updated with the Led's brightness.

In my version, I had included the following: float brightness = 0.0; brightness = led but this statement seems absurd due to two different kind of variables.

Can anyone say how does brightness in the original source gets updated? please send the link of the library which mentions so.

Thanks