In this project, I decided to explore how Arduino can communicate with Max and help create interesting integrated systems. The class discussions and patches sparked the idea of using frequency domain processing to control a system linked to Arduino. With a little experience in Arduino and looking up on tutorials and help from professor Jesse Stiles, TA Jeena Yin, Youtube, help forums, I could get together a system where 8 LEDs react to the sounds being passed into Max. The core ideas used were-
- Using jit.scanwrap to get the a 1 by 8 matrix of values relating to the amplitudes in the various frequency bins. These 8 values would compared to a threshold value to determine which LEDs to light up.
- The conditions would output a 0(LED off) or a 1(LED on) for all the 8 values in the matrix. These 8 values would each tell determine the state of their corresponding LED. In order to do so, these values needed to be passed into Arduino board through the serial port connected to it.
- Due to restrictions on passing a value greater than 255 or passing separate values under the time constraint, passing something like 11000001 was not possible. Finding out about these restrictions led me to think of a way to pass an 8 digit number into the Arduino. Then I thought that a binary number can represent a decimal number which could be passed into Arduino. An 8 digit binary number cannot go over the value 256 which was perfect.
- In the patch, the encapsulated code takes in the 8 digit binary number and converts it to a decimal number which is then sent to the Arduino board
- For the Arduino board, the code I wrote takes input from Serial Port and converts it back into an array of binary numbers. The code for this was more than the knowledge of Arduino I had, so I took it from an Arduino forum from the post by ‘guix ‘ who is an Edison member of the Arduino community- https://forum.arduino.cc/index.php?topic=333006.0
- The array used the resulting 8 digits of 0s and 1s to determine which LEDs would be on.
The following code is the Max patch-
<pre><code>
———-begin_max5_patcher———-
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———–end_max5_patcher———–
</code></pre>
The following code is the Arduino code-
int led1=1;
int led2=1;
int led3=1;
int led4=1;
int led5=1;
int led6=1;
int led7=1;
int led8=1;
//2 is on state, 1 is off state
void setup() {
// put your setup code here, to run once:
pinMode(2,OUTPUT);
pinMode(3,OUTPUT);
pinMode(4,OUTPUT);
pinMode(5,OUTPUT);
pinMode(6,OUTPUT);
pinMode(7,OUTPUT);
pinMode(8,OUTPUT);
pinMode(9,OUTPUT);
pinMode(10,OUTPUT);
pinMode(11,OUTPUT);
Serial.begin(9600);
}
void loop() {
// put your main code here, to run repeatedly:
if (Serial.available()){
int x=Serial.read();
uint8_t bitsCount = sizeof( x ) * 8;
char val[ bitsCount + 1 ];
uint8_t i = -8;
while ( bitsCount– )
val[ i++ ] = bitRead( x, bitsCount ) + ‘0’;
val[ i ] = ‘\0′;
if (val[0]==’1′){
led1=2;
}else {
led1=1;
}
if (val[1]==’1′){
led2=2;
}else {
led2=1;
}
if (val[2]==’1′){
led3=2;
}else {
led3=1;
}
if (val[3]==’1′){
led4=2;
}else {
led4=1;
}
if (val[4]==’1′){
led5=2;
}else {
led5=1;
}
if (val[5]==’1′){
led6=2;
}else {
led6=1;
}
if (val[6]==’1′){
led7=2;
}else {
led7=1;
}
if (val[7]==’1’){
led8=2;
}else {
led8=1;
}
}
//Serial.println(led2);
if (led1==2){
digitalWrite(2,HIGH);
}else{
digitalWrite(2,LOW);
}
if (led2==2){
digitalWrite(3,HIGH);
}else{
digitalWrite(3,LOW);
}
if (led3==2){
digitalWrite(4,HIGH);
}else{
digitalWrite(4,LOW);
}
if (led4==2){
digitalWrite(5,HIGH);
}else{
digitalWrite(5,LOW);
}
if (led5==2){
digitalWrite(6,HIGH);
}else{
digitalWrite(6,LOW);
}
if (led6==2){
digitalWrite(7,HIGH);
}else{
digitalWrite(7,LOW);
}
if (led7==2){
digitalWrite(8,HIGH);
}else{
digitalWrite(8,LOW);
}
if (led8==2){
digitalWrite(9,HIGH);
}else{
digitalWrite(9,LOW);
}
}
To show the LEDs in action, here is some videos of the LEDs reacting to the songs played as well as the code and patch used-
Hope you enjoyed!