Temperature App Development - Code 3 of 3
Code Insert 1 Voltage = 5; % Placeholder for Voltage TempK = 298; % Place Holder for Temp in Kelvin switch app.UnitsDropDown.Value %Identifying what to reference case "Voltage" % When the string is "Voltage" app.TempLabel.Text = num2str(Voltage,3); % Convert the value to a string and assign to the label. Precision 3 case 'Celsius' % When the string is "Celsius" TempC = TempK - 273.15; % Convert Kelvin to Celsius app.TempLabel.Text = num2str(TempC,3); % Convert the value to a string and assign to the label. Precision 3 case 'Fahrenheit' % When the string is "Fahrenheit" TempF=((TempK -273.15)*1.8)+32; % Convert Kelvin to Fahrenheit app.TempLabel.Text = num2str(TempF,3); % Convert the value to a string and assign to the label. Precision 3 end Code Insert 2 app.a = arduino(); % Connects the Arduino app.TakeReadingA0Button.BackgroundColor = [0.30,0.75,0.93]; % Changes color of button after connection Code Insert 3 volts = readVoltage(app.a,'A1'); % Get value from the digital pin an store it in digital R2=10000; % the value of the precision resistor temp0 = 298.15; % reference temperature (25 C), in Kelvin res0 = 10000; % resistance at reference temperature, in Ohms B = 3950; % thermistor B parameter, in Kelvin current=volts/R2; % calculate the current using Ohm's law Resistance=(5-volts)/current; % find the resistance of the thermistor recip_temp = 1/temp0 + log(Resistance/res0)/B; % Calculate the reciprocal of the TempK TempK = 1./recip_temp; % Calculate Temp in Kelvin switch app.UnitsDropDown.Value % Identifying what to reference case "Voltage" % When the string is "Voltage" app.TempLabel.Text = num2str(volts,3) % Convert the value to a string and assign to the label. Precision 3 case "Celsius" % When the string is "Voltage" TempC = TempK -273.15 % Convert to Celsius app.TempLabel.Text = num2str(TempC,3) % Convert the value to a string and assign to the label. Precision 3 case "Fahrenheit" % When the string is "Voltage" TempF=((TempK -273.15)*1.8)+32; % Convert to Fahrenheit app.TempLabel.Text = num2str(TempF,3) % Convert the value to a string and assign to the label. Precision 3 end
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