Motorcycle Alarm

Any number of normally open switches may be used. Fit the mercury switches so that they close when the steering is moved or when the bike is lifted off its side-stand or pushed forward off its centre-stand. Use micro-switches to protect removable panels and the lids of panniers etc. While at least one switch remains closed, the siren will sound. About two minutes after the switches have been opened again, the alarm will reset.

The circuit described involves a security system designed for motorcycles, utilizing normally open switches to detect unauthorized movement or tampering. The use of mercury switches is particularly advantageous in this application due to their sensitivity to tilt and motion. These switches are strategically positioned to close the circuit when the motorcycle is either steered or lifted from its resting position. This ensures that any movement triggers the alarm system, enhancing security.

In addition to the mercury switches, micro-switches are incorporated to monitor removable components such as panels and panniers. These switches serve as an additional layer of security, ensuring that any unauthorized access to these areas will trigger the alarm.

The alarm system is designed to be active as long as at least one switch remains closed, indicating that the motorcycle is in a state of potential tampering or movement. The siren will sound immediately upon the closure of any switch, alerting the owner and potentially deterring thieves.

To ensure that the alarm does not become a nuisance, a reset feature is included. The system is programmed to automatically reset approximately two minutes after all switches have been opened, allowing the owner to resume normal operation without constant alarm activation. The overall design emphasizes reliability and ease of use, making it suitable for various motorcycle models.

This circuit can be implemented using basic electronic components such as resistors, a siren, and a microcontroller or relay to manage the logic of the switches and the alarm system. Proper placement and calibration of the switches are critical for optimal performance and reliability.Any number of normally open switches may be used. Fit the mercury switches so that they close when the steering is moved or when the bike is lifted off its side-stand or pushed forward off its centre-stand. Use micro-switches to protect removable panels and the lids of panniers etc. While at least one switch remains closed, the siren will sound. About two minutes after the switches have been opened again, the alarm will reset. 🔗 External reference