Interfacing with android app

How to interface thermometer analog data giving input to audio jack of mobile and Matlab application will process and display output in mobile.

Answer 1

[Amish]

Hi Pawan,

To interface a thermometer’s analog data with a mobile device via the audio jack and process it using MATLAB, you can follow these steps:

1. Analog to Audio Signal Conversion: This involves using an operational amplifier (op-amp) to modulate the signal within the audio frequency range.
2. Connect the output of the circuit to the mobile device’s audio jack. You might need a TRRS (Tip-Ring-Ring-Sleeve) connector to ensure proper connection.
3. Install MATLAB Mobile on your device. Ensure you have the necessary support packages for sensor data collection.
4. Use MATLAB Mobile to acquire audio data. You can access the microphone data using the mobiledev object in MATLAB.
5. Process the acquired audio data to extract the temperature information. This might involve filtering and demodulating the signal.

You can refer to the following links for more information.

Sensor Data Collection with MATLAB Mobile:

https://www.mathworks.com/help/matlabmobile/ug/sensor-data-collection-with-matlab-mobile.html

Hope this helps!