The application is intended primarily for EPT drivers ... on a night shift.
The application triggers an alarm in the event of failure of the phone / tablet battery charging.
Loss of charging (230V in the socket) may be caused by the stoppage of the main converter of the traction vehicle (voltage loss in the traction network). Waking up an alarm on the phone is supposed to ... draw attention.
Requirements for proper operation:
1. the application must be active on the screen of the phone / tablet (it does not work in the background and with the screensaver active);
2. if the phone / tablet is powered from the 230V socket - the alarm will be triggered when the 3 × 400 / 230V converter is stopped;
3. if the phone / tablet is powered from the USB socket on the vehicle - the EPT batteries must be "disconnected" to activate the alarm (if the power supply of the USB socket does not depend on the operation of the main converter).