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"measure temperature from i2c device using arduino hardware".

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HI, I am trying to read a data from tmp102 sensor with MATLAB by using arduino board. Here I am using I2C communication Before this I was able to read many sensor data with MATLAB by using arduino board with I2C communication. but for tmp102 sensor I am able to read the address and follow the data and write the required bytes, but when I read I am getting error "Failed to read 2 uint8 value(s) from the device." The code used is :
clear all clc a = arduino();
addrs = scanI2CBus(a)
tmp102 = i2cdev(a, '0x48')
write(tmp102, 0, 'uint8');
data = read(tmp102, 2, 'uint8');
temperature = (double(bitshift(int16(data(1)), 4)) + double(bitshift(int16(data(2)), -4))) * 0.0625
writeRegister(tmp102, 1, hex2dec('60B0'), 'uint16');
pause(0.25);
data = readRegister(tmp102, 0, 'int16');
temperature = double(bitshift(bitand(data, hex2dec('FFF8')), -3)) * 0.0625
writeRegister(tmp102, 1, hex2dec('60A0'), 'int16');
clear tmp102 a
Please help to resolve this issue. I am using MATLAB 2018b
Thanks saketh
  2 Comments
TAMALAMPUDI VENKATA SAI SAKETH REDDY
Iam using the code and connections which was given in the link provided by the mathworks https://www.mathworks.com/help/supportpkg/arduinoio/examples/measure-temperature-from-i2c-device-on-arduino-hardware.html?prodcode=ML .But Iam getting an error"Failed to read 2 uint8 value(s) from the device" when i running the code in the matlab version 2018b with arduino uno board.And while running the code Iam getting 0x0 empty cell array in the address place.Can you resolve the code and give the correct code.
thank you

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Answers (3)

Madhu Govindarajan
Madhu Govindarajan on 20 Mar 2019
What is the Arduino board using and does your hardware setup look similar to the one shown here - https://www.mathworks.com/help/supportpkg/arduinoio/examples/measure-temperature-from-i2c-device-on-arduino-hardware.html?prodcode=ML
  2 Comments
Madhu Govindarajan
Madhu Govindarajan on 21 Mar 2019
What happens if you remove the following three lines of code and run the rest of the code? -
write(tmp102, 0, 'uint8');
data = read(tmp102, 2, 'uint8');
temperature = (double(bitshift(int16(data(1)), 4)) + double(bitshift(int16(data(2)), -4))) * 0.0625

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TAMALAMPUDI VENKATA SAI SAKETH REDDY
it was giving an error "failed to read int16 values from register 0".sir our project final review date was ahead. Can u please give the correct code to get output. Thank you for the response

Madhu Govindarajan
Madhu Govindarajan on 22 Mar 2019
Can you try with other arduino boards or other sensors? That code works for me on the Arduino and TMP102 sensor.
  4 Comments
Madhu Govindarajan
Madhu Govindarajan on 27 Mar 2019
Try testing it from Arduino IDE itself and if that also does not work then you know the sensor is not working. If that works, reach out to MathWorks Technical Support.

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