Hello everyone,
I am planning to do a board game with RGB LEDs, I've installed everything using only 4 RGB LEDs, however I want to use more (about 25 RGB LEDs), and each one has 3 output pins for R, G and B.
So in order to do that I am using 16 channel analog multiplexer.
I never used a multiplexer, and I got the code online, I tried to light up one RGB LED, but it's not working properly. I'm not sure what I'm doing wrong. As far as I know, I should get the right channel of the pin with s0, s1, s2 & s3 then write the value to sig.
At first the RGB did not light up, then I put delay(250), and it started lighting up each color separately (R then delay by 250 and G ... ).
this is the code:
int s3 = 6;
int s2 = 7;
int s1 = 8;
int s0 = 9;
int muxChannel[16][4]={
{0,0,0,0}, //channel 0
{1,0,0,0}, //channel 1
{0,1,0,0}, //channel 2
{1,1,0,0}, //channel 3
{0,0,1,0}, //channel 4
{1,0,1,0}, //channel 5
{0,1,1,0}, //channel 6
{1,1,1,0}, //channel 7
{0,0,0,1}, //channel 8
{1,0,0,1}, //channel 9
{0,1,0,1}, //channel 10
{1,1,0,1}, //channel 11
{0,0,1,1}, //channel 12
{1,0,1,1}, //channel 13
{0,1,1,1}, //channel 14
{1,1,1,1} //channel 15
};
int controlPin[] = {s0, s1, s2, s3};
int sig = 5;
int led3[6] = {8, 9, 10, 0, 0, 0};
void setup()
{
pinMode(s0, OUTPUT);
pinMode(s1, OUTPUT);
pinMode(s2, OUTPUT);
pinMode(s3, OUTPUT);
digitalWrite(s0, LOW);
digitalWrite(s1, LOW);
digitalWrite(s2, LOW);
digitalWrite(s3, LOW);
pinMode(sig, OUTPUT);
Serial.begin(9600);
}
void loop()
{ setCol(led3, 150, 0, 0);
delay(100);
}
void setCol(int* led, int r, int g, int b) {
for(int i = 0; i < 4; i ++){
digitalWrite(controlPin[i], muxChannel[led[0]][i]);
}
analogWrite(sig, r);
delay(250);
for(int i = 0; i < 4; i ++){
digitalWrite(controlPin[i], muxChannel[led[1]][i]);
}
analogWrite(sig, g);
delay(250);
for(int i = 0; i < 4; i ++){
digitalWrite(controlPin[i], muxChannel[led[2]][i]);
}
analogWrite(sig, b);
delay(250);
}
how do I make this work, how can I connect RGB LED with this multiplexer properly?
Tried hours looking online but no luck.
Thank you
It "kind of" worked at the time. So since a 470 Ohm resistor is not an entirely unusual value for a LED resistor, if you want to light one LED, that is not too bad. But when you want to multiplex them, one sixteenth of that average current will indeed be rather dim.
