Scheme introduction:
The passenger car safety belt reminder system is a set of voice reminder device used for operating passenger cars to remind passengers who do not wear safety belts. It includes a number of signal collectors installed under the passenger seats, and a host for signal collection and playing reminder voice. The collector is powered by batteries and connected with two detection switches (one to detect whether the seat is occupied, and the other to detect whether the seat belt is fastened). After someone is seated, the information about not fastening the seat belt is transmitted wirelessly; The host is powered by the DC power supply inside the vehicle, and is connected to an external horn (or connected to the horn through a power amplifier). After receiving the information about the user's seat belt not fastened from the collector, the host will broadcast the corresponding voice to remind the passenger to fasten his seat belt.
Product specifications:
1. Operating frequency: 433.92MHz or 315MHz or other customized frequencies
2. Modulation and demodulation mode: ASK
3. Encoding and decoding method: learning code
4. Mainframe working voltage: DC24V or DC12V
5. Host standby current:<18mA
6. Host receiving sensitivity: - 110dBm
7. Number of collectors supported by the host: 70 (more can be customized)
8. Host external horn: 8 ohms (other resistance values can be customized)
9. Working voltage of collector: DC3V (powered by one CR2032 button battery)
10. Standby current of collector:<0.2uA
11. Transmitter power of collector: 0dBm
12. Communication distance: 50m.
Picture of collector board:
Technical characteristics of the scheme:
1. The unique coding technology is adopted to ensure the reliability and improve the transmission efficiency, which can accommodate 6 collector information within 1 second;
2. The transmitting and receiving frequencies can be customized according to customer requirements to avoid interference of the same frequency;
3. High receiving sensitivity, multiple verification, reliable receiving signal, no error code;
4. The host can easily learn the code of the collector, so that the collector with any number can be added or deleted;
5. The collector battery can last for 3 years;
6. You can modify and add prompt voice, and modify and add functions according to customer needs;
7. The circuit board can be designed according to the customer's housing;
8. Low cost and high cost performance;
9. The product is easy to install and maintain.
