Arduino I2C and mod-tc-mk2-31855 [SOLVED]

[enricocas]

Hi everybody,
I'm trying to interface an arduino to the MOD-TC-MK2-31855 sensor board, but I'm having many difficulties getting data. I post here the sketch I wrote. Is it correct, or am I doing something wrong?? I'm getting all 255 int values.
Thank you very much,

Code Select Expand



#include <Wire.h>

void setup(){
  pinMode(A4, INPUT);
  pinMode(A5, INPUT);
  Wire.begin();
  Serial.begin(9600);
}
void loop(){
  Wire.beginTransmission(byte(0x48));
  Wire.write(0x01);
  Wire.write(0xA0);
  Wire.write(byte(0x23));
  Wire.endTransmission();
  //Wire.beginTransmission(byte(0x48));
  Wire.requestFrom(0x48,4);
  //Wire.endTransmission();
  byte c[4];
  int i=0;
  Serial.print("Start geting data");
  while(Wire.available())
  {
    c[i] =Wire.read();
    Serial.print(int(c[i]));
    i++;
  }
  delay(1000);
}




[selfbg]

Hi Enrico,

Replace

Code Select Expand


Wire.write(byte(0x23))
with

Code Select Expand


Wire.write(byte(0x21))


If this doesn't work for you try to reduce slightly I2C speed to 80kHz.
Edit twi.h file (Arduino_dir/libraries/Wire/utilites/):

Code Select Expand


#define TWI_FREQ 80000L


[olimex]

AVR-T32U4 #Arduino Leonardo measure temperatures from -250C to +1600C with thermocouples http://olimex.wordpress.com/2013/05/28/measuring-temperatures-from-250c-to-1600c-with-avr-t32u4-arduino-leonardo-and-mod-tc-mk2-31885-thermocouple/ ...

[enricocas]

Thank you

[jack]

do you know if you can connect together 2or more of mk2 to A4, A5?

[olimex]

yes, many MK2 can be connected on same I2C bus as they could have different addresses

[jack]

how to change address?
do you have a picture of how to connect to arduino? thanks

[jack]

now it works!! WOW

[jack]

sorry, how to change address?