Reactive lightning

Other Hardware LEDs and Multiplexing
1

Hi

I´m trying to controll an pwm output but i´m not abel to make it fade the way i want.

I´m using a ldr to read the light intensity and i want the led to fade when the value gets to high. I want the led to fade down a bit and when the light intensity value sinks i want the led to fade up.

Anyone got any ide of solving this??

2

enough ideas,

can you post your code written so far?
it is easier to see deltas on your own code.

3

It´s not much but it´s a start i think..

const int sensorlightPin = A0 ;       // Sensor Light
const int sensorheatPin = A1 ;        // Sensor Heat
const int analogOutPin = 5;           // Led 
const int ledoutvaluemin = 150;       // Led min 
const int ledoutvaluemax = 1024;      // Led max 
const int ledheatmax = 512;           // Led max Temp
const int sensorlightmax = 950;       // Sensor Light max
const int fade = 10;                  // Fade



int sensorlightvalue = 0;       // Variabel Sensor light
int sensorheatvalue = 0;        // Variabel Heat
int ledoutvalue = 0;            // Variabel Led 
int lastreading = 0;            // Lastreading Light
int ledoutvalue1 =0;            // 0-255 PWM Led



void setup() { 

  Serial.begin(9600);
}


void loop () {
  
 sensorlightvalue = analogRead(sensorlightPin);  // Read Light
 sensorheatvalue= analogRead(sensorheatPin);   // Read Temp
 lastreading = analogRead(sensorlightPin);      // Read lastreading Light
 delay(10);



if (sensorlightvalue > sensorlightmax) 



 if (sensorheatvalue > ledheatmax) {
   ledoutvalue = ledoutvaluemin;
 }
 
  else if (sensorlightvalue > sensorlightmax)
 {ledoutvalue = lastreading - fade;}  
  
  
 
  else ledoutvalue= ledoutvaluemax;
  ledoutvalue1 = map(ledoutvalue, 0, 1023, 0, 255);
  
  
  
  analogWrite(analogOutPin, ledoutvalue1);
 
 
 
 
 Serial.print ("SensorLight = ");
 Serial.print (sensorlightvalue);
 Serial.print ("\t SensorTemp = ");
 Serial.println (sensorheatvalue);
 Serial.print ("LedValue = ");
Serial.println (ledoutvalue);
Serial.print ("PWM led = ");
Serial.println (ledoutvalue1);
 
 delay (200);
  
}
4

it is quite a lot already

Please use [ code] tags --> # button above smileys (you can still modify your post)

you have to learn to use good layout : TIP use CTRL-T in the IDE and see what happens,

I'll have a look at the code

5

refactored to only your requirements in your first post
removed unneeded comments as you use good variable names.

const int sensorlightPin = A0 ;
const int analogOutPin = 5;
const int sensorlightmin = 200; 
const int sensorlightmax = 950; 
const int fade = 100;       

void setup() 
{ 
  Serial.begin(9600);
}


void loop () 
{
  // I´m using a ldr to read the light intensity 
  int sensorlightvalue = analogRead(sensorlightPin);
  int ledoutvalue = sensorlightvalue;

  // i want the led to fade when the value gets to high
  if (sensorlightvalue > sensorlightmax)
  {
    ledoutvalue = sensorlightvalue - fade;
  }

  // and when the light intensity value sinks i want the led to fade up
  if (sensorlightvalue < sensorlightmin)
  {
    ledoutvalue = sensorlightvalue + fade;
  }

  // adjust the value to the output range
  ledoutvalue = map(ledoutvalue, 0, 1023, 0, 255);
  // and apply to the LED
  analogWrite(analogOutPin, ledoutvalue);

  Serial.print ("SensorLight = ");
  Serial.print (sensorlightvalue);
  Serial.print ("LedValue = ");
  Serial.println (ledoutvalue);

  delay (1000);
}
6

Thank you !!

Works great but i´m having one more issue and it´s to make the led fade ( smooth or stepwise) up and down. Any advice ?

7

make fade a formula instead of a constant. make it depend on the amount above the max or min.

  if (sensorlightvalue > sensorlightmax)
  {
    fade = 4 * (sensorlightvalue  - sensorlightmax);
    ledoutvalue = sensorlightvalue - fade;
  }