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I'm building a device that uses two ultrasonic sensors to detect objects and provide audio feedback in the form of beeps that get faster the closer an object is. I have two speakers, one for each sensor, but the tone command will only do one set of beeps at a time. I tried to get around this with the Polytone Library and polytone command, but when I go to compile, I get an "exit status 1. Error compiling for board Arduino Uno" message. What am I doing wrong? Is there another way to get both sensors beeping at the same time? Please help!

I'm very new at coding. I tried to put the polytone code in a couple different ways, which I can show if that helps. There's also gyroscope code in there, but I have that working pretty well, so I guess just ignore that.

    #include <digitalWriteFast.h>
#include <Polytone.h>

#include <Wire.h> //library allows communication with I2C / TWI devices
#include <math.h> //library includes mathematical functions


const int MPU=0x68; //I2C address of the MPU-6050
int16_t AcX,AcY,AcZ,Tmp,GyX,GyY,GyZ; //16-bit integers
int AcXcal,AcYcal,AcZcal,GyXcal,GyYcal,GyZcal,tcal; //calibration variables
double t,tx,tf,pitch,roll;


const int anPin1 = 0;
const int anPin2 = 1;
int triggerPin1 = 13;


long distance1, distance2;


//Code Part 2: Level LEDS
// Level LEDs
int levelLED_level = 11;
int levelLED_rollpos = 9;
int levelLED_rollneg = 8;
int levelLED_pitchpos = 12;
int levelLED_pitchneg = 10;
int LED_temp = 7;
Polytone poly;
void setup(){
    Serial.begin(9600);  // sets the serial port to 9600
    pinMode(triggerPin1, OUTPUT);


Wire.begin(); //initiate wire library and I2C
Wire.beginTransmission(MPU); //begin transmission to I2C slave device
Wire.write(0x6B); // PWR_MGMT_1 register
Wire.write(0); // set to zero (wakes up the MPU-6050)  
Wire.endTransmission(true); //ends transmission to I2C slave device
Serial.begin(9600); //serial communication at 9600 bauds


pinMode(levelLED_rollneg, OUTPUT);
pinMode(levelLED_rollpos, OUTPUT);
pinMode(levelLED_pitchpos, OUTPUT);
pinMode(levelLED_pitchneg, OUTPUT);
pinMode(levelLED_level, OUTPUT);



}


void start_sensor(){
  digitalWrite(triggerPin1,HIGH);
  delay(1);
  digitalWrite(triggerPin1,LOW);
}


void read_sensors(){
  /*
  Scale factor is (Vcc/512) per inch. A 5V supply yields ~9.8mV/in
  Arduino analog pin goes from 0 to 1024, so the value has to be divided by 2 to get the actual inches
  /
  distance1 = analogRead(anPin1)1.35;
  distance2 = analogRead(anPin2)*2.092;
}


void print_all(){
  Serial.print("MB1000");
  Serial.print(" ");
  Serial.print(distance1);
  Serial.print("mm");
  Serial.print(" ");
  Serial.print(" ");
  Serial.print("MB1260");
  Serial.print(" ");
  Serial.print(distance2);
  Serial.print("mm");
  Serial.println();
}


//Front sensor ranges
void midiSlowFront() {
  poly.begin(); // Set up polling timer interrupt
  poly.setPins(4,5); // Connect pins 4-5 to positive terminal of speaker/piezo


poly.tone(262);
  delay(2000.0);
  poly.end();
}
void midiFront() {
   poly.begin(); // Set up polling timer interrupt
   poly.setPins(4,5); // Connect pins 4-5 to positive terminal of speaker/piezo
   poly.tone(262);
   delay(500.0);
   poly.end();
}
void midiFastFront() {
   poly.begin(); // Set up polling timer interrupt
   poly.setPins(4,5); // Connect pins 4-5 to positive terminal of speaker/piezo
   poly.tone(262);
   delay(150.0);
   poly.end();
}


//Side sensor ranges
void midiSlowSide() {
   poly.begin(); // Set up polling timer interrupt
   poly.setPins(4,5); // Connect pins 4-5 to positive terminal of speaker/piezo
   poly.tone(440);
   delay(2000.0);
   poly.end();
}
void midiSide() {
   poly.begin(); // Set up polling timer interrupt
   poly.setPins(4,5); // Connect pins 4-5 to positive terminal of speaker/piezo
   poly.tone(440);
   delay(500.0);
   poly.end();
}
void midiFastSide() {
   poly.begin(); // Set up polling timer interrupt
   poly.setPins(4,5); // Connect pins 4-5 to positive terminal of speaker/piezo
   poly.tone(440);
   delay(150.0);
   poly.end();
}


void loop(){
    Wire.beginTransmission(MPU); //begin transmission to I2C slave device
    Wire.write(0x3B); // starting with register 0x3B (ACCEL_XOUT_H)
    Wire.endTransmission(false); //restarts transmission to I2C slave device
    Wire.requestFrom(MPU,14,true); //request 14 registers in total


start_sensor();
read_sensors();
print_all();

//Acceleration data correction
AcXcal = -950;
AcYcal = -300;
AcZcal = 0;

//Temperature correction
tcal = -1600;

//Gyro correction
GyXcal = 480;
GyYcal = 170;
GyZcal = 210;


//read accelerometer data
AcX=Wire.read()&lt;&lt;8|Wire.read(); // 0x3B (ACCEL_XOUT_H) 0x3C (ACCEL_XOUT_L)  
AcY=Wire.read()&lt;&lt;8|Wire.read(); // 0x3D (ACCEL_YOUT_H) 0x3E (ACCEL_YOUT_L)
AcZ=Wire.read()&lt;&lt;8|Wire.read(); // 0x3F (ACCEL_ZOUT_H) 0x40 (ACCEL_ZOUT_L)

//read temperature data
Tmp=Wire.read()&lt;&lt;8|Wire.read(); // 0x41 (TEMP_OUT_H) 0x42 (TEMP_OUT_L)

//read gyroscope data
GyX=Wire.read()&lt;&lt;8|Wire.read(); // 0x43 (GYRO_XOUT_H) 0x44 (GYRO_XOUT_L)
GyY=Wire.read()&lt;&lt;8|Wire.read(); // 0x45 (GYRO_YOUT_H) 0x46 (GYRO_YOUT_L)
GyZ=Wire.read()&lt;&lt;8|Wire.read(); // 0x47 (GYRO_ZOUT_H) 0x48 (GYRO_ZOUT_L)

//temperature calculation
tx = Tmp + tcal;
t = tx/340 + 36.53; //equation for temperature in degrees C from datasheet
tf = (t * 9/5) + 32; //fahrenheit

//get pitch/roll
getAngle(AcX,AcY,AcZ);

//printing values to serial port
Serial.print(&quot;Angle: &quot;);
Serial.print(&quot;Pitch = &quot;); Serial.print(pitch);
Serial.print(&quot; Roll = &quot;); Serial.println(roll);

Serial.print(&quot;Temperature in celsius = &quot;); Serial.print(t);  
Serial.print(&quot; fahrenheit = &quot;); Serial.println(tf);  

if ((roll &lt; 7.00) &amp;&amp; (roll &gt; -7.00) &amp;&amp; (pitch &gt; -7.00) &amp;&amp; (pitch &lt; 7.00)){
digitalWrite(levelLED_rollpos, LOW);
digitalWrite(levelLED_rollneg, LOW);
digitalWrite(levelLED_level, HIGH);
digitalWrite(levelLED_pitchpos, LOW);
digitalWrite(levelLED_pitchneg, LOW);
}

if (roll &gt; 7.01) {
// Turn on Pos Roll LED
digitalWrite(levelLED_rollpos, HIGH);
digitalWrite(levelLED_rollneg, LOW);
digitalWrite(levelLED_level, LOW);
digitalWrite(levelLED_pitchpos, LOW);
digitalWrite(levelLED_pitchneg, LOW);
}

if (roll &lt; -7.01) {
//Turn on Neg Roll LED
digitalWrite(levelLED_rollpos, LOW);
digitalWrite(levelLED_rollneg, HIGH);
digitalWrite(levelLED_level, LOW);
digitalWrite(levelLED_pitchpos, LOW);
digitalWrite(levelLED_pitchneg, LOW);
}

if (pitch &lt; -7.01) {
//Turn on Neg Pitch
digitalWrite(levelLED_rollpos, LOW);
digitalWrite(levelLED_rollneg, LOW);
digitalWrite(levelLED_level, LOW);
digitalWrite(levelLED_pitchpos, LOW);
digitalWrite(levelLED_pitchneg, HIGH);
}

if (pitch &gt; 7.01) {
//Turn on Pos Pitch
digitalWrite(levelLED_rollpos, LOW);
digitalWrite(levelLED_rollneg, LOW);
digitalWrite(levelLED_level, LOW);
digitalWrite(levelLED_pitchpos, HIGH);
digitalWrite(levelLED_pitchneg, LOW);
}

if ((pitch &gt; 7.01) &amp;&amp; (roll &gt; 7.01)){
digitalWrite(levelLED_rollpos, HIGH);
digitalWrite(levelLED_rollneg, LOW);
digitalWrite(levelLED_level, LOW);
digitalWrite(levelLED_pitchpos, HIGH);
digitalWrite(levelLED_pitchneg, LOW);
}

if ((roll &gt; 7.01) &amp;&amp; (pitch &lt; -7.01)){
 digitalWrite(levelLED_rollpos, HIGH);
digitalWrite(levelLED_rollneg, LOW);
digitalWrite(levelLED_level, LOW);
digitalWrite(levelLED_pitchpos, LOW);
digitalWrite(levelLED_pitchneg, HIGH);
}

if ((roll &lt; -7.01) &amp;&amp; (pitch &lt; -7.01)){
 digitalWrite(levelLED_rollpos, LOW);
digitalWrite(levelLED_rollneg, HIGH);
digitalWrite(levelLED_level, LOW);
digitalWrite(levelLED_pitchpos, LOW);
digitalWrite(levelLED_pitchneg, HIGH);
}

if ((roll &lt; -7.01) &amp;&amp; (pitch &gt; 7.01)){
 digitalWrite(levelLED_rollpos, LOW);
digitalWrite(levelLED_rollneg, HIGH);
digitalWrite(levelLED_level, LOW);
digitalWrite(levelLED_pitchpos, HIGH);
digitalWrite(levelLED_pitchneg, LOW);
}

if (tf &gt; 72.00){
  digitalWrite(LED_temp, HIGH);
}

if (tf &lt; 72.00){
  digitalWrite(LED_temp, LOW);
}

if((distance1 &gt; 24)){
midiSlowFront();
}
if((distance1 &lt; 24) &amp;&amp; (distance1 &gt; 12)){
midiFront();
}
if(distance1 &lt; 12){
midiFastFront();
}
if(distance2 &gt; 24){
midiSlowSide();
}
if((distance2 &lt; 24) &amp;&amp; (distance2 &gt; 12)){
midiSide();
}
if(distance2 &lt; 12){
midiFastSide();
}



delay(150);
}


//function to convert accelerometer values into pitch and roll
void getAngle(int Ax,int Ay,int Az) {
    double x = Ax;
    double y = Ay;
    double z = Az;


pitch = atan(x/sqrt((y*y) + (z*z))); //pitch calculation
roll = atan(y/sqrt((x*x) + (z*z))); //roll calculation

//converting radians into degrees
pitch = pitch * (180.0/3.14);
roll = roll * (180.0/3.14) ;



}

EDIT: Here's the stuff before the error message, my bad!



In file included from C:\Users\Documents\Arduino\polytonetest\polytonetest.ino:1:0:


C:\Users\Documents\Arduino\libraries\arduino-polytone-master\src/digitalWriteFast.h:25:0: warning: "digitalPinToTimer" redefined


#define digitalPinToTimer(P) \


In file included from sketch\polytonetest.ino.cpp:1:0:


C:\Program Files (x86)\Arduino\hardware\arduino\avr\cores\arduino/Arduino.h:180:0: note: this is the location of the previous definition


#define digitalPinToTimer(P) ( pgm_read_byte( digital_pin_to_timer_PGM + (P) ) )


In file included from C:\Users\Documents\Arduino\libraries\arduino-polytone-master\src\Polytone.h:11:0,


             from C:\Users\Documents\Arduino\libraries\arduino-polytone-master\src\Polytone.cpp:7:




C:\Users\Documents\Arduino\libraries\arduino-polytone-master\src\digitalWriteFast.h:25:0: warning: "digitalPinToTimer" redefined


#define digitalPinToTimer(P) \


In file included from C:\Users\Documents\Arduino\libraries\arduino-polytone-master\src\Polytone.h:10:0,


             from C:\Users\Documents\Arduino\libraries\arduino-polytone-master\src\Polytone.cpp:7:




C:\Program Files (x86)\Arduino\hardware\arduino\avr\cores\arduino/Arduino.h:180:0: note: this is the location of the previous definition


#define digitalPinToTimer(P) ( pgm_read_byte( digital_pin_to_timer_PGM + (P) ) )


libraries\arduino-polytone-master\Polytone.cpp.o (symbol from plugin): In function `Polytone::begin()':


(.text+0x0): multiple definition of `t'


sketch\polytonetest.ino.cpp.o (symbol from plugin):(.text+0x0): first defined here


C:\Users\Documents\Arduino\libraries\arduino-polytone-master\src\Polytone.cpp:18:15: warning: type of 't' does not match original declaration [-Wlto-type-mismatch]


unsigned long t = 0;


           ^




C:\Users\Documents\Arduino\polytonetest\polytonetest.ino:12:8: note: type 'double' should match type 'long unsigned int'


double t,tx,tf,pitch,roll;


    ^




C:\Users\Documents\Arduino\polytonetest\polytonetest.ino:12:8: note: 't' was previously declared here


C:\Users\Documents\Arduino\polytonetest\polytonetest.ino:12:8: note: code may be misoptimized unless -fno-strict-aliasing is used


collect2.exe: error: ld returned 1 exit status
Kaytee
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