Mobile app backend (using MIT App Inventor).
App icon.
Mobile app published in the MIT App Inventor Gallery.
The mobile app functions are:
Display the capacity in real time through Bluetooth connection with the Arduino board.
Issue an alarm if negative capacity is detected or the maximum capacity is exceeded.
Make a phone call to the user when the maximum capacity is reached.
Send the data to a Google Sheet to create a historical record of the capacity.
By clicking here, you'll get to the MIT App Inventor Gallery, in which the mobile app is published so that you can import it to your account and download it!