INA219 Current Sensor Integration with MATLAB

Hi There,

I am trying to use a INA219 current sensor to obtain the voltage and current and thus power from a Solar Panel. This chip works with an arduino. I have coded in arduino and got the values i require however when I try to read these values on MATLAB I cannot get it to work.

The Code that I have written is Here:

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

clc clear all

a = arduino;

INA219 = '0x40';

INA219_ADC_CH0 = '40'; % getBusVoltage_V

INA219_ADC_CH1 = '41'; % getVoltage_mV

INA219_ADC_CH3 = '43'; % getCurrent_mA

i2c = i2cdev(a,INA219);

disp(['getBusVoltage_V ', 'getVoltage_mV', 'getCurrent_mA']);

while 1

getBusVoltage_V = read_adc(i2c,hex2dec(INA219_ADC_CH0));

pause(0.5);

getVoltage_mV = read_adc(i2c,hex2dec(INA219_ADC_CH1));

pause(0.5);

getCurrent_mA = read_adc(i2c,hex2dec(INA219_ADC_CH3));

pause(0.5);

disp([getBusVoltage_V,getVoltage_mV,getCurrent_mA]);

end

function adc = read_adc(dev,config)

write(dev,config);

read(dev, 3);

out = read(dev, 3);

adc = out;

end

~~~~~~~~~~~~~~~~~~~~~~~~~~~

Where the output is:

   60     0     0

    31     3     0

   255   255   255.

I was expecting an output of roughly:

2.46 0.03 0.07
*obtained from my arduino code.

I cannot seem to find where I've gone wrong, perhaps my limited knowledge in the area. Any help you could provide to rectify this would be great.

Regards,

Jayden

[Martin Blocher]

Hi there, I'm having the same problem, did you get it to work? If so, please let me know, thank you.

[Raul Ballesteros]

I have the same problem If find the solution Please share the vos es Thanks

[Gongyan Du]

I have the same problem

Answer 1

[Gongyan Du]

Have you solved this problem, can you share it?

Answer 2

[David Fournier]

My solution to this problem was to program the arduino to output the values from the INA219 in a comma separated format on the serial port, then just read them from the serial port in MATLAB. If anyone has the solution to just do this in MATLAB, please post!

Arduino code snippet

shuntvoltage = ina219.getShuntVoltage_mV();

busvoltage = ina219.getBusVoltage_V();

current_mA = ina219.getCurrent_mA();

power_mW = ina219.getPower_mW();

loadvoltage = busvoltage + (shuntvoltage / 1000);

Serial.print(busvoltage); Serial.print(",");

Serial.print(shuntvoltage);Serial.print(",");

Serial.print(loadvoltage);Serial.print(",");

Serial.print(current_mA);Serial.print(",");

Serial.println(power_mW);

delay(1000);

MATLAB App code snippet

methods (Access = private)

function results = serial(app)

% Define the serial port and baud rate

port = "COM6"; % Change this to your Arduino's port

baudRate = 9600;

% Create a serialport object

app.arduinoObj = serialport(port, baudRate);

% Configure the terminator to match the Arduino's serial output

configureTerminator(app.arduinoObj, "LF");

% Flush any old data

flush(app.arduinoObj);

end

function results = plot(app)

% Read line of data

line = readline(app.arduinoObj);

% Split the line into multiple values

values = str2double(split(line, ','));

% Append data

app.data = [app.data; values']; % you definitely need the apostrophe here!

app.time = [app.time; datetime("now")];

disp (app.data); % This line just prints data to the workspace for troubleshooting

% Plots data to an Axes figure called UIAxes

plot (app.UIAxes, app.time, app.data);