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get data and plot graph from multiples termocouples in Arduino

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Angel Lira
Angel Lira on 27 Jul 2018
Answered: Gayatri Menon on 31 Jul 2018
Hi guys, I am having a problem trying to figure out how to plot a graph into Matlab of multiple termocouples using OneWire library from Arduino. I am a beginner in this programming stuff so, right now I am stuck on. The arduino reads the data fine, but I don't know how to get this data into Matlab.
Here is the Arduino code: #include OneWire.h #include DallasTemperature.h
// Data wire is plugged into port 2 on the Arduino #define ONE_WIRE_BUS 2
// Setup a oneWire instance to communicate with any OneWire devices (not just Maxim/Dallas temperature ICs) OneWire oneWire(ONE_WIRE_BUS);
// Pass our oneWire reference to Dallas Temperature. DallasTemperature sensors(&oneWire); DeviceAddress addr;
void setup(void) { // start serial port Serial.begin(9600); Serial.println("Dallas Temperature IC Control Library Demo");
// Start up the library
sensors.begin();
}
void loop(void) { // call sensors.requestTemperatures() to issue a global temperature // request to all devices on the bus Serial.print("Requesting temperatures..."); sensors.requestTemperatures(); // Send the command to get temperatures Serial.println("DONE");
for (uint8_t s=0; s < sensors.getDeviceCount(); s++) {
// get the unique address
sensors.getAddress(addr, s);
// just look at bottom two bytes, which is pretty likely to be unique
int smalladdr = (addr[6] << 8) | addr[7];
Serial.print("Temperature for the device #"); Serial.print(s);
Serial.print(" with ID #"); Serial.print(smalladdr);
Serial.print(" is: ");
Serial.println(sensors.getTempCByIndex(s));
}
}
Here is the shame of my Matlab code, where I got it so far: clear global clear a %call library OneWire in Matlab a = arduino('COM3', 'Uno', 'libraries','PaulStoffregen/OneWire'); a.InputBufferSize = 1;%read one byte every time try fopen(arduino); x = linspace(1,100); %100 samples numcols = 1;
catch err fclose(instrfind); error('Make sure you selected the right port'); end
%define pin for sensor addon
sensor = addon(a,'PaulStoffregen/OneWire','D2');
%getting addresses
addr = sensor.AvailableAddresses();
fscanf(a)
%define variables for sensors
%sensorOne = sensor.AvailableAddresses{1};
%sensorTwo = sensor.AvailableAddresses{2};
reset(sensor);
If anyone could shy a light for me, any guidance is welcome. Thanks a lot!

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Accepted Answer

Gayatri Menon
Gayatri Menon on 31 Jul 2018
Hi Angel,
Since you are printing the data to Serial monitor using Arduino IDE, you could create a serial object in MATLAB to read the data transmitted by the Arduino. To read the data transmitted serially from arduino, using a serial object in MATLAB could be a good approach. Please refer to the below link to know more about creating Serial object:
Hope this helps.
Thanks
Gayatri

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