Hotel ultrasonic interference detection system based on ultrasonic probe DSP interference US0012

The circuit consists of the US0012 ultrasonic interference detection system, as illustrated in the accompanying figure. When the SEL40k termination is set to high, it selects a clock frequency of 40kHz. The US0012 module can perform several tasks: it provides a 40kHz clock frequency, adjusts the sensitivity of the US0012, and receives alarm signals generated by the US0012 to initiate appropriate actions via the controller. The configuration of the 40kHz ultrasonic transmitter and receiver is adapted for the US0012 sensor, which is mounted atop a column to enhance the coverage area. When not connected to an external input amplifier, the effective detection range for vehicles can reach up to 35 meters. C1 is a capacitor on the side, selected for high-speed sensitivity with a value of 270pF. C2 and C3 serve as power supply decoupling capacitors. The bias circuit for the preamplifier is formed by C4 and R1. The RX receiver should be connected using shielded cable, with the shield grounded to RXGND to minimize interference. To protect the chip from strong interference, a double limiter diode can be connected to the input pin for overvoltage protection.

The US0012 ultrasonic interference detection system is designed to operate efficiently in environments where ultrasonic signals are utilized for object detection. The selection of a 40kHz frequency is critical, as it is commonly used in various ultrasonic applications, ensuring reliable performance while minimizing interference from other sources.

The placement of the sensor at an elevated position allows for a broader detection area, making it suitable for applications in traffic monitoring or security systems where vehicle detection is essential. The effective range of up to 35 meters indicates that the system can cover substantial distances, which is advantageous in open spaces.

Capacitors C1, C2, and C3 play vital roles in the circuit's performance. C1, with its 270pF rating, enhances the circuit's high-speed sensitivity, allowing for rapid response to detected ultrasonic signals. C2 and C3 are critical for stabilizing the power supply, ensuring that fluctuations do not affect the performance of the US0012 module.

The biasing network composed of C4 and R1 is essential for setting the appropriate operating point of the preamplifier, which amplifies the received signals for further processing. Proper grounding of the RX receiver through shielded cable is crucial to prevent noise pickup, which could lead to false alarms or missed detections.

Incorporating a double limiter diode at the input pin serves as an essential protective measure against voltage spikes, safeguarding the circuit's integrity. This design consideration is particularly important in environments prone to electrical noise or where the detection system may be exposed to harsh conditions. Overall, the US0012 ultrasonic interference detection system is a robust solution for reliable object detection in various applications. Circuit constituted by the US0012 and P ultrasonic interference detection system is shown in Fig. When SEL40k termination high, select 40kHz clock frequency. P can use to compl ete the following tasks: first, to provide US0012 40kHz clock frequency; a second set US0012 sensitivity; third, receiving the alarm signal US0012 issued and perform the appropriate action by the controller. The 40kHz ultrasonic transmitter and receiver configuration sensor US0012 adaptation. The sensor is mounted on top of a column, you can increase the coverage area. When not connected to an external input amplifier effective detection distance of the vehicle interior up to 35m.

C1 for the side of the capacitor CAP, choose to take the high-speed sensitivity when C1 270pF. C2 and C3 are power supply decoupling capacitors. Bias circuit preamplifier composed by C4 and R1. RX receiver to the end of the lead should adopt shielded cable, the shield connected RXGND end. To avoid strong interference is detected and damage the chip, if necessary, double limiter diode connected to the input pin, from the overvoltage protection effect.