The mercury switch module and the digital 13 interface comes with an LED to build a simple circuit to make a tilt indicator light. Use the LED that comes with the digital 13 interface to connect the mercury tilt switch sensor to the digital 3 interface. When the mercury tilt switch sensor senses a key signal , LED is on, otherwise it is off. That is, when the product is not tilted, the vibration switch is on, the output terminal outputs low level, and the green indicator light is on; when the product is tilted, the vibration switch is off, and the output terminal outputs high level, green The indicator light is on; the output terminal can be directly connected to the single-chip microcomputer, and the high and low level can be detected by the single-chip microcomputer, so as to detect whether the environment is tilted, and play the role of angle tilt alarm!
note:
Mercury is toxic to the human body and the environment, so be careful when using the mercury switch to avoid breaking the glass tube and causing the mercury to leak. If it breaks accidentally, open the windows immediately and ventilate the doors and windows to prevent mercury vapor from being inhaled. At this time, do not use a rag or mop to wipe the scattered mercury, so as not to contaminate more places. The mercury beads can be collected with paper or plastic, etc., placed in an airtight container, and discarded to the designated location. Minimize exposure to mercury.

Module wiring:
1. VCC: connected to the power supply
2. GND: connect to the negative power supply
3. DO: digital signal output