Having some problems with Serial.write in Arduino - arduino

Question

I'm learning Arduino and programming some basic stuff just to exercise, but I'm stuck with a RGB LED. I'll link the code in order for you to see what's happening.
int RGB_R = A5,
RGB_G = A4,
RGB_B = A3;
void setup() {
pinMode(RGB_R, OUTPUT);
pinMode(RGB_G, OUTPUT);
pinMode(RGB_B, OUTPUT);
Serial.begin(9600);
}
void loop() {
for(int i = 0; i < 256; i++){
Serial.write(i);
for(int j = 0; j < 256; j++){
for(int k = 0; k < 256; k++){
RGB_COLOR(i,j,k);
}
}
}
}
void RGB_COLOR(int R, int G, int B){
analogWrite(RGB_R, R);
analogWrite(RGB_G, G);
analogWrite(RGB_B, B);
}
I want to change the color of the RGB slowly as i, j and k increment, but it's changing between 2 colors. Another problem that I'm having is that I can't print in Serial what's the value of i, j and k.
Hope you guys can help me.

Answer 1

you have to provide some delay after setting the RGB_COLOR
because the code excuted fast and you can't see the change add a delay function it will be slower changeing
void loop() {
for(int i = 0; i < 256; i++){
for(int j = 0; j < 256; j++){
for(int k = 0; k < 256; k++){
// sending data to pc
Serial.print("\ti= ");Serial.print(i);
Serial.print("\tj= ");Serial.print(j);
Serial.print("\tk= ");Serial.println(k);
// change the data
RGB_COLOR(i,j,k);
delay(100); // wait for 100 ms
}
}
}
}
update :
you have to connect pins on PWM pin ... if you use arduino uno it will be (10,11,6,5,3) and change the connection
int RGB_R = 10,
RGB_G = 11,
RGB_B = 6;
the full code
connect the pins on (10,11,6) ... because analogWrite only work correctlly with pwm pins
int RGB_R = 10,
RGB_G = 11,
RGB_B = 6;
void setup() {
pinMode(RGB_R, OUTPUT);
pinMode(RGB_G, OUTPUT);
pinMode(RGB_B, OUTPUT);
Serial.begin(9600);
}
void loop() {
for(int i = 0; i < 256; i++){
for(int j = 0; j < 256; j++){
for(int k = 0; k < 256; k++){
// sending data to pc
Serial.print("\ti= ");Serial.print(i);
Serial.print("\tj= ");Serial.print(j);
Serial.print("\tk= ");Serial.println(k);
// change the data
RGB_COLOR(i,j,k);
delay(100); // wait for 100 ms
}
}
}
}
void RGB_COLOR(int R, int G, int B){
analogWrite(RGB_R, R);
analogWrite(RGB_G, G);
analogWrite(RGB_B, B);
}