aaapa12

I've been researching for a while on how to control 2 leds using Max and Arduino. I just want to control 2 at this point in time.

 and I have tried everything that is in there. I can get the dimmer tutorial posted there to work fine, but I don't even know where to begin so as to control a second led.

Also I have tried Maxuino but I can not find any good tutorials, and it confuses me to no end.

See I don't just want to control leds, I want to put the two on the sliders, and then control the slider using my kinect. I have figured that part out, now I just need to be able to do it for 2 leds instead of one.

I've seen this topic: Here and I have tried everything that is in there. I can get the dimmer tutorial posted there to work fine, but I don't even know where to begin so as to control a second led.

See I don't just want to control leds, I want to put the two on the sliders, and then control the slider using my kinect. I have figured that part out, now I just need to be able to do it for 2 leds instead of one.


controlling-2-leds-using-max-and-arduino

Are you looking to turn the lights on and off, or get them to vary brightness?

I tend to pack the values I want to send to LEDs/servos/motors/whatever in a list, ended by a '\n' so I can parse them at the other end easily. I've also heard good things about the 

 library for parsing comma-separated messages.

Patch for controlling brightness of two LEDs:

EDIT: The delay/speedlim times are pretty arbitrary in those examples. I limit the speed of the messages being sent to the Arduino to prevent the slowdown you get when you fire too many messages at serial, and the delay in the Arduino is a 'best practice' to let the CPU rest.

I tend to pack the values I want to send to LEDs/servos/motors/whatever in a list, ended by a '\n' so I can parse them at the other end easily. I've also heard good things about the Cmd Messenger library for parsing comma-separated messages.

Patch for controlling brightness of two LEDs: 

void setup() {
  pinMode(led1, OUTPUT);
  pinMode(led2, OUTPUT);
  Serial.begin(9600);
}

void loop() {
  if (Serial.available() > 0) {
    led1Brightness = Serial.parseInt();
    led2Brightness = Serial.parseInt();
    if (Serial.read() == '\n') {
      analogWrite(led1, led1Brightness);
      analogWrite(led2, led2Brightness);
    }
    delay(10);
  }
}

EDIT: The delay/speedlim times are pretty arbitrary in those examples. I limit the speed of the messages being sent to the Arduino to prevent the slowdown you get when you fire too many messages at serial, and the delay in the Arduino is a 'best practice' to let the CPU rest.


Medd I'm trying to use your arduino code but it is giving me an error message saying there is an extra \ in the code and highlighting this part:

So I got the code to upload into the arduino, but I can't get the max patcher to communicate to the arduino.

On another note I got The code below to work but I need to control the brightness of the leds, not just turn them on and off.

// constants to hold the output pin numbers:

int currentPin = 0; // current pin to be faded

int brightness = 0; // current brightness level

// if there’s any serial data in the buffer, read a byte:

// respond to the values ‘a’, ‘b’, ‘c’, or ’0′ through ’9′.

// you don’t care about any other value:

if (inByte >= ’0′ && inByte < = '9') {

// map the incoming byte value to the range of the analogWrite() command

brightness = map(inByte, ’0′, ’9′, 0, 255);

// set the current pin to the current brightness:

Edit:
So I got the code to upload into the arduino, but I can't get the max patcher to communicate to the arduino.

/*
Serial RGB LED controller
by Tom Igoe
adaboed by Scott Fitzgerald
Controls three LEDs whose legs are
connected to pins 9, 10, and 11.
*/
// constants to hold the output pin numbers:
const int LEDone = 9;
const int LEDtwo = 10;
const int LEDthree = 11;
int currentPin = 0; // current pin to be faded
int brightness = 0; // current brightness level
void setup() {
// initiate serial communication:
Serial.begin(9600);
// initialize the LED pins as outputs:
pinMode(LEDone, OUTPUT);
pinMode(LEDtwo, OUTPUT);
pinMode(LEDthree, OUTPUT);
}
void loop() {
// if there’s any serial data in the buffer, read a byte:
if (Serial.available() > 0) {
int inByte = Serial.read();
Serial.write(inByte);
// respond to the values ‘a’, ‘b’, ‘c’, or ’0′ through ’9′.
// you don’t care about any other value:
if (inByte == ‘a’) {
currentPin = LEDone;
}
if (inByte == ‘b’) {
currentPin = LEDtwo;
}
if (inByte == ‘c’) {
currentPin = LEDthree;
}
if (inByte >= ’0′ && inByte < = '9') {
// map the incoming byte value to the range of the analogWrite() command
brightness = map(inByte, ’0′, ’9′, 0, 255);
// set the current pin to the current brightness:
analogWrite(currentPin, brightness);
}
}
}

After playing around all day with the codes and upon further research I was able to get everything to communicate just as I wanted them too. Below is the resulting code.

const int LEDone = 9;
const int LEDtwo = 10;

void setup(){
  Serial.begin(9600);
  pinMode(LEDone, OUTPUT);
  pinMode(LEDtwo, OUTPUT);
}

void loop(){
  if(Serial.available()>0){
    int inByte = Serial.read();
    Serial.write(inByte);

    if(inByte =='a'){
      currentPin = LEDone;
    }

    if(inByte == 'b')
    { currentPin = LEDtwo; }

    if (inByte>= 0 && inByte
      brightness = inByte;
      analogWrite(currentPin,brightness);
    }
  }

The error you mentioned in my code happened to me when I pasted my code across as there was weird formatting on the apostrophes in '\n' added by the forum!

Not sure what problem you're having with the Max patch? Did you add the serial port as an argument to the serial object? It all works fine for me.

Controlling 2 LEDs using Max and Arduino