YupiMamut

Hi I'm currently working on a project which consists of a digital theremin that works with two motion sensors one controlling pitch and one controlling volume. Basically I am using two arduinos one for each sensor and am trying to make them communicate with max using serial ports. I have managed to get them working separately but not when I plug them in together. When I plug them in together only one communicates with max. I think it must be a problem with how I'm using the serial ports but I've been investigating for ages and haven't found a solution. Any help would be much appreciated. Thanks in advance.

Here is the max patch I'm currently using:

And this is the code used for programming the different arduinos:

#define echoPin 4 // 4 pin, connect to echo

#define trigPin 5 // 5 pin, connect to trig

pinMode(echoPin, INPUT); // define 4 pin to in

pinMode(trigPin, OUTPUT); // define 5 pin to out

#define echoPin 6 // 6 pin, connect to echo

#define trigPin 7 // 7 pin, connect to trig

pinMode(echoPin, INPUT); // define 6 pin to in

pinMode(trigPin, OUTPUT); // define 7 pin to out

-Arduino1:
#define echoPin 4 // 4 pin, connect to echo
#define trigPin 5 // 5 pin, connect to trig

void setup() {
  Serial.begin(9600);
  pinMode(echoPin, INPUT); // define 4 pin to in
  pinMode(trigPin, OUTPUT); // define 5 pin to out
}

void loop() {
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  long duration = pulseIn(echoPin,HIGH);
  long distancia = duration /29 / 2 ;

-Arduino2:
#define echoPin 6 // 6 pin, connect to echo
#define trigPin 7 // 7 pin, connect to trig

void setup() {
  Serial.begin(9700);
  pinMode(echoPin, INPUT); // define 6 pin to in
  pinMode(trigPin, OUTPUT); // define 7 pin to out
}

void loop() {
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  long length = pulseIn(echoPin,HIGH);
  long distance = length /29 / 2 ;

Gettng two independent arduinos to communicate with max through serial