Dual Function Key Switches
Dual Function interlock Key Switches is a Key Switches that combines Electric Key Switch and Mechanical Key Lock, which is Simultaneously have power control and could mechanically protect the equipment from invading.
Our company's Key Lock Electrical Switches has mounting dimensions of 12mm and 19mm. This 2 Position Key Switch is widely used in the field of security products, which not only can achieve the function of switching power supply but also could protect customer`s confidential data.Application including buses, cars, motorcycles, ATM and so on.
Below are the specifications:
Electrical and row piece dual function
Zinc alloy die cast housing and cylinder
Barrel chrome or nickel plated standard
Lock case, white iron cover
4 disc tumbler mechanism
Brass tubular keys or Bilateral bilateral milling copper key, nickel plated
The iron bar has a standard size of 13mm or Row Piece, can be made according to customer requirements.
Key may be withdraws in one or both position aSilver terminals and Contacts.
Dual-Function Switches,Dual Push Button Switch,Automatic Transfer Switch,Changeover Switch YESWITCH ELECTRONICS CO., LTD. , https://www.yeswitches.com
Research on Application and Architecture of DSP Technology in Vehicle Positioning Anti-theft System
With the continuous improvement of living standards, cars have become a common asset in many households. As a result, the demand for advanced anti-theft solutions has significantly increased. Although current car alarms on the market are becoming more sophisticated, they still rely largely on traditional methods such as audible alarms and high-voltage shocks. However, with the rapid advancement of technology, car theft techniques have also evolved, making conventional security measures less effective. This growing challenge has made vehicle anti-theft an important area of research for both automotive manufacturers and insurance companies. In response to the rising global trend of car theft, automakers are constantly enhancing their anti-theff technologies, particularly by integrating microelectronics. The development of car anti-theft systems is now moving towards automation and intelligence, offering better protection for vehicle owners.
Since the United States officially launched the GPS system at the end of the last century, GPS technology has been widely adopted across various industries. Today, the GPS market is booming, especially in the field of vehicle positioning and navigation, where it holds the largest share and shows the fastest growth. According to recent statistics, sales of GPS-enabled navigation systems rose from $500 million in 1996 to $3 billion by 2000, and this upward trend is expected to continue. Driven by the potential of this market, many countries around the world are investing heavily in research on vehicle navigation and positioning technologies. In China, GPS-based vehicle tracking and navigation systems are still in their early stages, but specialized applications are already being implemented. For example, government departments use GPS to monitor and control vehicles such as armored trucks, ambulances, buses, police patrol cars, and prison transport vehicles, ensuring real-time tracking and efficient command.
Combining GPS with GSM technology offers a powerful solution for modern vehicle security. While GPS enables accurate global positioning, GSM provides wide coverage and SMS capabilities, allowing vehicle owners to receive real-time updates about their car's status. This integration enhances overall anti-theft performance, making it easier for users to monitor and respond to potential threats quickly.
The system architecture is based on a Digital Signal Processor (DSP) chip, which controls the GPS module, the GSM communication module, and necessary peripheral circuits. The block diagram of the system is shown in Figure 1. The DSP communicates with both the GPS and GSM modules via serial ports. The GSM module is directly connected to the DSP’s serial port, while the GPS module uses an 8251 chip to expand another serial port. The DSP’s I/O ports are multiplexed, allowing them to function as general-purpose inputs/outputs after setting the appropriate control registers.
Once the system is initialized, it continuously receives location data from the GPS receiver and waits for interrupts from user queries or sensor signals. If the system is not armed, it does not process any incoming signals. However, once the arming signal is active, the DSP processes the GPS data, extracting useful information like latitude, longitude, time, and checksums, and stores it in designated memory locations. The GSM module communicates with the DSP through a serial port, using interrupts to trigger actions when abnormal conditions occur, such as the car door opening or the engine starting.
If the DSP detects an engine start, it triggers an interrupt and sends a message to the owner, who can then be alerted. If no response is received, the system will resend the message every five minutes, with a 1-minute interval and a 30-second local alarm. Similarly, power failure or fuel cut-off alerts are immediately transmitted, followed by brake activation after 20 seconds. All these events are accompanied by GPS position data sent to the user for real-time tracking.
When a user sends a query to check the car's status, the system responds accordingly. If the system is not armed, it informs the user that the system is disarmed. If it is armed and functioning normally, it confirms that everything is fine. If there is an issue, the system locks the car and sends a detailed alert to the owner. To unlock the system, the user must send a specific password.
In terms of feasibility, the use of DSP technology offers significant advantages. With its high-speed processing capability, multiple hardware multipliers, and efficient instruction set, the DSP ensures fast and reliable operation. The TMS320LF240, used in this system, is a cost-effective 16-bit fixed-point DSP designed for motor control and other industrial applications. Its limited number of serial ports and external interrupts requires some expansion, but the rest of the I/O ports can be configured as general-purpose inputs/outputs.
GPS technology, developed by the U.S. since 1973 and fully operational by 1994, consists of three main components: satellites, ground control, and user equipment. The basic function of a GPS receiver is to track satellite signals and calculate position based on the C/A code. The system includes a frequency processing circuit, signal processor, and memory for storing location data.
GSM short message service is a key component of the communication system, allowing messages to be sent without establishing a direct connection. The TC35T module, used in this system, facilitates two-way communication between the vehicle and the owner, providing secure, efficient, and low-cost messaging.
In conclusion, this system integrates GPS and GSM technologies to create a smart, automated vehicle anti-theft and positioning solution. By leveraging the power of DSP, it improves both security and functionality, laying a strong foundation for future network-based vehicle management systems.