Set.setpwm adafruit library arduino

[Arabmoney]

Hello there,

Im currently working on a project where i need to control the LED brightness with PWM through adafruit library. My issue is that im using this command here "set.setPWM (channelnum, time on, time off) so what i need is to use a time off to set a value of PWM in order to get the right brightness from the LEDs. But I have a sensor as a feedback where i use it to adjust the brightness, so when it is brighter than usual, or dimmer than the required, the PWM need to increment or decrements. So how do i use the command set.setPWM ( 7, 0, 1865) to adjust the PWM ? if( lux < 5483) pwm.setPWM(7, 0, 1865++); else
{ pwm.setPWM(7, 0, 1865--);

[OpusK]

Hello, @Arabmoney

I do not know what the setPWM () function used in adafruit is, but you can also use the analogWrite () function to adjust the brightness of the LED (please see this example)

However, this function is 8 bits resolution. Therefore, if you want higher resolution, please refer to this issue.

[Arabmoney]

Thanks for the quick reply.

I`m a bit concerned about this method as i have an external pwm controller 12channels. Now i do get it each channel working, but the only issue is adjusting one channel only to regulate a temperature or an LED.

#include <Wire.h>
#include <BH1750.h>
#include <Adafruit_PWMServoDriver.h>
Adafruit_PWMServoDriver pwm = Adafruit_PWMServoDriver();

BH1750 lightMeter;

//SDA connected to pin Analog 4
//SCL connected to pin Analog 5
//Gnd >>>Gnd  
 int pwmint = 2048;

void setup()
{
pwm.begin();
pwm.setPWMFreq(1600); 
Serial.begin(115200);
Wire.begin();
lightMeter.begin();
Serial.println(F("BH1750 Test"));
 pwm.setPWM(7, 0, pwmint);
}
void loop()
{

  uint16_t lux = lightMeter.readLightLevel();
  Serial.print("Light: ");
  Serial.print(lux);
  Serial.println(" lx");
  delay(500);
if( lux < 5483) 
{
  pwmint--;
 pwm.setPWM(7, 0, pwmint);

}
else   
{
  pwmint++;
 pwm.setPWM(7, 0, pwmint);
//pwm.setPWM(7, 0, 4096);
//pwm.setPWM(8, 4095,0 );
}
}

}

[OpusK]

Well ... As for how to use Adafruit's library, you can get accurate and quick answers in the official forum. We do not know about the Adafruit library.