Wire and Servo library conflict?

Projects Programming
1

Hello,
I have a project that reads data from a TPA81 thermopile using I2C and it moves a servo based on the readings. When the Wire commands are in the code the servos don't respond to Servo.write() commands. If I remove the Wire commands then the servos will responds as expected.

I'm using an Uno and compiling on a verion 1.0.1.

Am I missing something or do the Wire.h and Servo.h libraries not work together? The code is below:

#include <Servo.h>
#include <Wire.h>
#define TPA81ADDR (0xd0>>1)

int pixel[9] = {0};
Servo panservo;

void setup() 
{ 
  Wire.begin();        // join i2c bus (address optional for master) 
  Serial.begin(9600);  // start serial for output 
  Serial.print("starting TPA81 test\n");
  panservo.attach(9); //attach servo to pin 9
  panservo.write(90); //set the inital servo position to 90 degrees

} 
 
void loop() 
{
  byte b; // used to store data from TPA81
  int i; //used for counting in for loops

   for (i=1; i<=9; i++)
  {
    Wire.beginTransmission(TPA81ADDR);  //Begin Communication with TPA81    
    Wire.write(i);    //Send reg to TPA81
    Wire.endTransmission();
    Wire.requestFrom(TPA81ADDR, (int) 1); //Request 1 byte
    //while(Wire.available() < 1);    //wait for byte to arrive
    while(Wire.available())
    b = Wire.read(); // receive a byte as character 
    pixel[i] = b;  //create an array of the pixels 
  } 

  panservo.write(45);
  delay(1000);
  panservo.write(135);
  delay(1000);

} //end main loop
2

Have you checked if you get any response from your sensor?

I use Servo and Wire together in another project and never got a problem, so it's not a fundamental problem.

3

Yes, the sensor data reads fine. I can put servo command prior to the Wire command and the servos will respond. The servos won't respond after the wire commands.

Even when attached to different pins the servos don't respond.

4

OK, so I tried removing the FOR loop that collects all the sensor data and now the servos respond. Is there something wrong with the way I'm retrieving the all the data from the sensor?

5

Solved. I was overrunning the data array.