A modular sensor for a vehicle, including a central hub including a low-power MCU with BLE communication capability, a power manager including a rechargeable battery and a charger IC, at least one integrated sensor selected from among an accelerometer, a microphone, a reed switch and a smoke detector IC, and at least one external sensor interface connector configured for I2C communication with, and providing power to, one or more external sensor modules, wherein the MCU receives event data from the at least one integrated sensor or from an external sensor module connected via the I2C communication, selectively manages power supplied to the one or more external sensor modules via the external sensor interface connector, and transmits an alert or data to a paired main vehicle dashcam via BLE based on the event data, the main vehicle dashcam configured to orchestrate responses based on the alert or the data.

A security system circuit for a vehicle includes an electronic main control unit, at least one electronically operated switch, which is arranged on an input line of an electric load of the vehicle. Each electronically operated switch is controlled by the main control unit and is configured to switch between a connected configuration. The electronically operated switch allows electricity to flow through the input line between a main electric power source of the vehicle and the electric load, and a cutoff configuration, where said electronically operated switch prevents electricity from circulating through the input line between the main power source and said electric load, a safety switch, configured to be activated by a user of the vehicle. The safety switch is configured to control the main control unit, so that each electronically operated switch switches to its cutoff configuration when the safety switch is activated.