One of 10 educational circuit boards we designed for a private training institution. The circuit monitors an external tilt sensor connected via a screw terminal; when the sensor detects tilting, it triggers a transistor that switches on a 2.3kHz piezo buzzer, producing an audible warning. A separate terminal connection allows the sensor to be mounted away from the board, wherever needed.
Our customer's goal was to teach students how an external sensor is wired into a circuit and interfaced, the logic of transistor switching, and how a piezo buzzer is driven, through a concrete example. We handled the full schematic and PCB design ourselves, using a screw terminal for the sensor connection to make assembly easy and flexible for students.
After the needs analysis, we designed the circuit connecting an external tilt sensor to a transistor switching stage and a buzzer output. We added a separate terminal block for the sensor connection and a reverse-polarity protection diode on the power input. We delivered the schematic and PCB design to the training institution.
