Read a LM92Temperature Sensor using a PIC16F877 and MATLAB

Reading a LM92 Temperature Sensor using a microcontroller PIC16F877 and display the plot with Matlab

Description

Reading a LM92 sensor temperature using a microcontroller PIC16F877, and using the Matlab to read the serial port and plot the results

Acknowledgements

The author wishes to acknowledge the following in the creation of this submission:
Read LM73 Temperature Sensor

• MATLAB release: MATLAB 7 (R14)
• Other requirements: a PIC16F877

[Sudhir Gupta]

It provides a starting point for Instrument Control ToolBox and RS-232 based data acquisition.

[shashank jain]

It provides a good startup for interfacing...Infact it debbuged my problem.

[Ved Vernekar]

what kind of data is being sent by the PIC?? if hex then wats the range accepted by the matlab code, i want 2 try it out using a comp to simulate the data transmission..... im workin on a similar project but using an 89c52

[wibble blibble]

See "Diode Temperature Sensor using I2C bus & ADM1034" for something similar that uses standard off-the-shelf hardware rather than having to program a PIC. It will work with any I2C sensor or ADC

[Anuradha Nanayakkara]

Hello all,

I need to read my sensor data which comes to the serial port of the PC continuously and plot them real time.
The above program do this only for a limited period of time.

When run with my sensor it gave the following error.

Warning: The input buffer was filled before the Terminator was reached.
Temperature= NaN oC

Can somebody help me to resolve this issue.

Is it ok if i increase the variable i in the following for loop to change from 0:65525(some big value)?
for i= 1 :60 %acquisition of 100 points
    
    data(i)=(str2double(fscanf((s1)))/100); %read sensor
    
    disp(sprintf('Temperature= %3.2f oC' ,data(i)))
  
end

plot(data); %plot 100 points

Also i can't understand how we are getting 100 values becaude we are chaanging i 0:60

Hoping a soon reply.

Thank you.