i try again but it still give's wrong value while i did the wire connection better?
Please anyone help me!

i make one pin output and take out by a jumper wire then measure it by mutlimeter.
i connect them relay and they can't swith the relay but when i connect directly the relay to 5+ it switch.
before i did this and there was no problem//

yes, all pins have the same problem and here the sketch:

Code:

int pin1= 11;
int pin2= 12;
int pin3= 13;
int counter = 0;
void setup(){
 Serial.begin(9600);
pinMode(pin1, OUTPUT);
pinMode(pin2, OUTPUT); 
  pinMode(pin3, OUTPUT);
 
}
 void loop() {
   int input = Serial.read();
   
   if (input == '3') {
      if (counter == 0) {
      Serial.print("on");
    analogWrite(pin3, 255);
     delay(5000);
      counter++;
      input = 0;
      }
   }
    if (input == '4') {
      if (counter == 0) {
     digitalWrite(pin3, LOW);
     Serial.print("low");
     counter++;
     input = 0;
      }
   }
    if (input == '1') {
       if (counter == 0) {
      Serial.print("1");
     digitalWrite(pin1, HIGH);
     
     delay(150);
      digitalWrite(pin1, LOW);
       counter++;
       input = 0;
       }
   }
    if (input == '2') {
       if (counter == 0) {
      Serial.print("2");
     digitalWrite(pin2, HIGH);
     delay(50);
      digitalWrite(pin2, LOW);
      delay(50);
      digitalWrite(pin2, HIGH);
     delay(50);
      digitalWrite(pin2, LOW);
       counter++;
       input = 0;
       
       }
       
   }
   counter = 0;
   }
   

hi there
i have a problem with arduino when i checked output of digital pin it gave me 4.2v instead of 5v, and i need 5v,any solution?
i don't know what is wrong, thanks for helping!
best regards

Please some answers?

thanks for all replay but i have a question about the range
does anyone know more about this sensor technically??

i just connected by jumber wire and breadboard

what should i do to make it better?

ah sorry here
https://www.sparkfun.com/products/10904

but the red rgb is 255,0,0
like if you put a red paper will it also be 255,0,0 or different because i think the light also effect it
thanks for helping me bro

can your give me the sketch?

yellow paper

Code:

Red: 210 Green: 392 Blue: 136
Red: 180 Green: 336 Blue: 119
Red: 190 Green: 350 Blue: 119
Red: 180 Green: 336 Blue: 119

red paper

Code:

Red: 100 Green: 140 Blue: 731
Red: 100 Green: 140 Blue: 612
Red: 100 Green: 140 Blue: 476
Red: 100 Green: 140 Blue: 357
Red: 100 Green: 154 Blue: 306
Red: 100 Green: 154 Blue: 238
Red: 100 Green: 140 Blue: 170

does it need to be in a dark room or the room light doesn't affect it?
does it need to switch on the led on the board, or not?
please explain more clearly cuz i'm a newbie

could give an anther code example and can you give sketch if you can
with my best regards

thanks for replaying, i just test some sticker papers , 5 cm away from the sensor

Hello everyone
i bought a HDJD-S822 Color Sensor from sparkfun. I search the hole internet but i found just one code for it

Code:

/*
An Arduino code example for interfacing with the
HDJD-S822-QR999 Color Sensor.  Put an object in front of the
sensor and look at the serial monitor to see the values the sensor
is reading.  Scaling factors and gains may have to be adjusted
for your application.

by: Jordan McConnell
 SparkFun Electronics
 created on: 1/24/12
 license: OSHW 1.0, http://freedomdefined.org/OSHW
 
Connect the gain pins of the sensor to digital pins 7 - 12 (or ground).
Connect the led pin to digital 13.
Connect Vr to analog 0, Vg to analog 1, and Vb to analog 2.
*/

// Define pins
const int ledpin = 13;
const int GSR1 = 12;
const int GSR0 = 11;
const int GSG1 = 10;
const int GSG0 = 9;
const int GSB1 = 8;
const int GSB0 = 7;

int redpin = A0;
int greenpin = A1;
int bluepin = A2;

// Sensor read values
int red = 0;
int green = 0;
int blue = 0;

void setup()
{
  Serial.begin(9600);

  pinMode(ledpin, OUTPUT);
  pinMode(GSR1, OUTPUT);
  pinMode(GSR0, OUTPUT);
  pinMode(GSG1, OUTPUT);
  pinMode(GSG0, OUTPUT);
  pinMode(GSB1, OUTPUT);
  pinMode(GSB0, OUTPUT);

  // Turn on the LED
  digitalWrite(ledpin, HIGH);
 
  // Set the gain of each sensor
  digitalWrite(GSR1, LOW);
  digitalWrite(GSR0, LOW);
  digitalWrite(GSG1, LOW);
  digitalWrite(GSG0, LOW);
  digitalWrite(GSB1, LOW);
  digitalWrite(GSB0, LOW);
}

void loop()
{
 
  // Read sensors
  // On page 7 of the datasheet, there is a graph of the
  // spectral responsivity of the chip.  Scaling factors were
  // selected based on this graph so that the gain of each
  // color is closer to being equal
  red = analogRead(redpin) * 10;
  green = analogRead(greenpin) * 14;
  blue = analogRead(bluepin) * 17;

  // Print values to the serial monitor
  Serial.print("Red: ");
  Serial.print(red, DEC);
  Serial.print("\t\tGreen: ");
  Serial.print(green, DEC);
  Serial.print("\tBlue: ");
  Serial.println(blue, DEC);

  delay(200);
}

i connected the pins as it says then i get this result now i don't know what to do with these?

Code:

Red: 20 Green: 350 Blue: 153
Red: 20 Green: 364 Blue: 153
Red: 10 Green: 280 Blue: 119
Red: 0 Green: 336 Blue: 221
Red: 0 Green: 336 Blue: 221
Red: 160 Green: 336 Blue: 204
Red: 160 Green: 336 Blue: 204
Red: 150 Green: 294 Blue: 170
Red: 170 Green: 336 Blue: 204
Red: 160 Green: 308 Blue: 187
Red: 180 Green: 378 Blue: 255
Red: 170 Green: 336 Blue: 204
Red: 170 Green: 336 Blue: 221
Red: 170 Green: 336 Blue: 204
Red: 180 Green: 364 Blue: 238
Red: 170 Green: 336 Blue: 204
Red: 180 Green: 378 Blue: 238
Red: 170 Green: 336 Blue: 204
Red: 180 Green: 37

i want to make something like when it detect red write in serial monitor red, same for other colors?
Please help me and i will be thanks full
thanks for replaying