led lights 12 volts flickers :o

Other Hardware General Electronics
1

Hello,
I am a total novice when it comes to electronics
Have connected a light strip 12 volts to the Arduino and using tip31 to fade up the light, everything works until the maximum light reached, then flicker only

I have a 1k resistor between pin 9 from the Arduino Nano touch base on tip31

that I can think of is that you should use something else instead of tip31 but have not a clue what
Some kind soul to help me

// Hasse
This is the code i use

int led = 9; // the PWM pin the LED is attached to
int brightness = 0; // how bright the LED is
int fadeAmount = 1; // how many points to fade the LED by

// the setup routine runs once when you press reset:
void setup() {
// declare pin 9 to be an output:
pinMode(led, OUTPUT);
brightness = 0; // to start things off
while (brightness < 255) { // this loops until the condition is true
analogWrite(led, brightness);

// change the brightness for next time through the loop:
brightness = brightness + fadeAmount;

// wait for 30 milliseconds to see the dimming effect
delay(30);
}

}

// the loop routine runs over and over again forever:
void loop() {
// set the brightness of pin 9:
analogWrite(led, brightness);

// change the brightness for next time through the loop:
brightness = brightness + fadeAmount;

}

2

Please read this

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 // Hasse
This is the code i use

int led = 9;           // the PWM pin the LED is attached to
int brightness = 0;    // how bright the LED is
int fadeAmount = 1;    // how many points to fade the LED by

// the setup routine runs once when you press reset:
void setup() {
  // declare pin 9 to be an output:
  pinMode(led, OUTPUT);
brightness = 0; // to start things off
while (brightness < 255) {  // this loops until the condition is true
    analogWrite(led, brightness);   

  // change the brightness for next time through the loop:
  brightness = brightness + fadeAmount;

  // wait for 30 milliseconds to see the dimming effect   
  delay(30); 
}

}

// the loop routine runs over and over again forever:
void loop() {
  // set the brightness of pin 9:
  analogWrite(led, brightness);

  // change the brightness for next time through the loop:
  brightness = brightness + fadeAmount;

  
  }
3 
int led = 9;           // the PWM pin the LED is attached to
int brightness;    // how bright the LED is
void setup() 
{
  pinMode(led, OUTPUT);
}

void loop() 
{
  for (brightness = 0; brightness < 256; brightness ++)
  {
    analogWrite(led, brightness);
    delay(30);
  }
  
  for (brightness = 254; brightness > 0; brightness --)
  {
    analogWrite(led, brightness);
    delay(30);
  }
}
4

This revision looks better --

extern const uint8_t gamma[];
int led = 9;           // the PWM pin the LED is attached to
int brightness;    // how bright the LED is
int corrected;
void setup() 
{
  pinMode(led, OUTPUT);
}
void loop() 
{
  for (brightness = 0; brightness < 256; brightness ++)
  {
    corrected = pgm_read_byte(&gamma[brightness]);
    analogWrite(led, corrected);
    delay(5);
  }
  
  for (brightness = 254; brightness > 0; brightness --)
  {
    corrected = pgm_read_byte(&gamma[brightness]);
    analogWrite(led, corrected);
    delay(5);
  }
}
const uint8_t PROGMEM gamma[] = {
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2,
2, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 5, 5, 5,
5, 6, 6, 6, 6, 7, 7, 7, 7, 8, 8, 8, 9, 9, 9, 10,
10, 10, 11, 11, 11, 12, 12, 13, 13, 13, 14, 14, 15, 15, 16, 16,
17, 17, 18, 18, 19, 19, 20, 20, 21, 21, 22, 22, 23, 24, 24, 25,
25, 26, 27, 27, 28, 29, 29, 30, 31, 32, 32, 33, 34, 35, 35, 36,
37, 38, 39, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 50,
51, 52, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 66, 67, 68,
69, 70, 72, 73, 74, 75, 77, 78, 79, 81, 82, 83, 85, 86, 87, 89,
90, 92, 93, 95, 96, 98, 99,101,102,104,105,107,109,110,112,114,
115,117,119,120,122,124,126,127,129,131,133,135,137,138,140,142,
144,146,148,150,152,154,156,158,160,162,164,167,169,171,173,175,
177,180,182,184,186,189,191,193,196,198,200,203,205,208,210,213,
215,218,220,223,225,228,231,233,236,239,241,244,247,249,252,255};
5

thx, work like a charm, but how should i do for the light to stay bright, not fade up and start over

6

how should i do for the light to stay bright, not fade up and start over

extern const uint8_t gamma[];
int led = 9;           // the PWM pin the LED is attached to
int brightness;    // how bright the LED is
int corrected;
boolean flag = false;
void setup() 
{
  pinMode(led, OUTPUT);
}
void loop() 
{
  if(flag == false)
  {
    for (brightness = 0; brightness < 256; brightness ++)
    {
      corrected = pgm_read_byte(&gamma[brightness]);
      analogWrite(led, corrected);
      delay(5);
    }
    flag = true;
  }
}

const uint8_t PROGMEM gamma[] = {
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2,
2, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 5, 5, 5,
5, 6, 6, 6, 6, 7, 7, 7, 7, 8, 8, 8, 9, 9, 9, 10,
10, 10, 11, 11, 11, 12, 12, 13, 13, 13, 14, 14, 15, 15, 16, 16,
17, 17, 18, 18, 19, 19, 20, 20, 21, 21, 22, 22, 23, 24, 24, 25,
25, 26, 27, 27, 28, 29, 29, 30, 31, 32, 32, 33, 34, 35, 35, 36,
37, 38, 39, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 50,
51, 52, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 66, 67, 68,
69, 70, 72, 73, 74, 75, 77, 78, 79, 81, 82, 83, 85, 86, 87, 89,
90, 92, 93, 95, 96, 98, 99,101,102,104,105,107,109,110,112,114,
115,117,119,120,122,124,126,127,129,131,133,135,137,138,140,142,
144,146,148,150,152,154,156,158,160,162,164,167,169,171,173,175,
177,180,182,184,186,189,191,193,196,198,200,203,205,208,210,213,
215,218,220,223,225,228,231,233,236,239,241,244,247,249,252,255};
7

Runaway Pancake u are the man, thx a lot
work wounderful :slight_smile:

thx again

//Hasse

8

A 1k base resistor for a TIP31.
How long is that LED strip.
30cm?

You should use a logic level mosfet with 220ohm gate resistor and 10k bleed resistor (pin to ground).
And a supply that can handle the current of the strip.
Post links.
Leo..