Thanks a lot, I will check it on the weekend... you will hear from me !!

Hi,
I have two MLX90614 sensors and wanna connect both on the i2cbus. How can I change the address of one of these parts ? I use the i2cmaster from peter fleury (thx!) and have found a codepart in a forum. There is mentioned the address 0x2E for the address register, in the datasheet I have read the address 00Eh - what is correct ?? Does anybody have experiences (and a tested code) for this intention ??

// Now change address. First erase
i2cstartwait(dev+I2CWRITE);  //send start condition and write bit
i2cwrite(0x2E);  //send command for device to return address
i2cwrite(0x00);  // send low byte zero to erase
i2cwrite(0x00);  //send high byte zero to erase
i2cwrite(0x6F);  // send PEC
i2cstop();  //Release bus, end transaction
delay(100); // then wait 10ms

// Then write new address
i2cstartwait(dev+I2CWRITE);  //send start condition and write bit
i2cwrite(0x2E);  //send command for device to return address
i2cwrite(0x50);  // send low byte of address
i2cwrite(0x00);  //send high byte of address
i2cwrite(0x63); // send PEC
i2cstop(); //Release bus, end transaction
delay(100); // then wait 10ms

thanks a lot. I have to detect this hotter space, the temperature is not relevant. Therefore I thought there works simply components like fotoresistors...

I have to detect heat in the range of approx. 50° C and a distance between 10 - 30 cm. I have already read the options TPA81 and Melexis MLX90614-boards with their price between 40 - 80 €. 

Is there a possibility to connect only a TPS334 (thermopile sensor) or MLX90614ESF-AAA components ? They should give a return value (voltage!) for my analog-input (or with i2c?), in the program I will convert this value into a approx. temperature. Has anybody experience with such a (cheaper) approach ?

Thanks in regard