The DO200 Parking Occupation Sensor is an intelligent device designed to detect the occupancy of parking spaces. It employs a hybrid detection method, combining both geomagnetic and ultrasonic technologies, to achieve high accuracy in determining whether a parking space is occupied. This dual-sensor approach enhances reliability and minimizes false readings.
Function Description:
The primary function of the DO200 sensor is to monitor the occupancy status of a parking space and report this information. It operates by continuously sensing changes in its environment. When a vehicle enters or exits the parking space, the sensor detects these changes and transmits the updated status.
- Geomagnetic Detection: The sensor measures changes in the Earth's magnetic field. When a large metallic object, such as a vehicle, parks over the sensor, it causes a perturbation in the magnetic field, which the sensor identifies as an occupied state. The default detection interval for geomagnetic changes is 10 seconds, allowing for quick response to vehicle presence.
- Ultrasonic Detection: In addition to geomagnetic sensing, the DO200 uses ultrasonic waves to measure the distance to the bottom of a vehicle. If the measured distance falls within an effective range of 0-50 cm, the parking space is considered occupied. This method provides an independent verification of occupancy, further improving accuracy. The default ultrasonic detection interval is 10 minutes.
- Heartbeat Reporting: The sensor periodically reports heartbeat data to confirm its operational status and connectivity. The default heartbeat reporting interval is 24 hours.
- Low Battery Alarm: To ensure continuous operation and facilitate timely maintenance, the DO200 is equipped with a low battery alarm feature. It triggers an alarm when the battery level drops below 20%.
- Self-Test Function (Self-Calibration): The device includes a self-calibration function that runs periodically to reduce errors and maintain accuracy over time. The default self-test interval is 24 hours (1440 minutes). These parameters, including detection intervals and alarm thresholds, can be modified via serial port (TTL) commands or through a dedicated platform, offering flexibility for various deployment scenarios.
Important Technical Specifications:
While specific detailed technical specifications like dimensions, weight, and battery type are not explicitly listed in the provided manual, the following can be inferred or are directly stated:
- Detection Technologies: Geomagnetic and Ultrasonic.
- Geomagnetic Detection Interval (Default): 10 seconds.
- Ultrasonic Detection Interval (Default): 10 minutes.
- Ultrasonic Effective Detection Distance: 0-50 cm (for occupied status).
- Heartbeat Reporting Interval (Default): 24 hours.
- Low Battery Alarm Threshold (Default): 20%.
- Self-Test/Self-Calibration Interval (Default): 24 hours (1440 minutes).
- Communication: NB-IoT (Narrowband Internet of Things).
- SIM Card Type: MICRO card.
- Power Supply: Battery-powered (implied by "connect the power supply" and "disconnect the battery").
Usage Features:
The DO200 is designed for straightforward installation and operation:
- NB-IoT Connectivity: The sensor utilizes NB-IoT for communication, enabling wide-area coverage and low power consumption, which is ideal for smart parking applications. Users need to install a MICRO SIM card into the device, ensuring the card's frequency band matches that of the device. The manual provides clear instructions and an image for SIM card installation, emphasizing correct position and orientation.
- Initialization: The device requires initialization after installation. This is done by moving a magnet around the probe one turn and then removing it. This action restarts the device. Upon successful reboot, the device reports its status, including being "moved" and its current full/empty state. This initialization step is crucial for the sensor to begin accurate operation.
- Quick Start Guide: The manual provides a step-by-step quick start guide for setting up and testing the sensor:
- Open the case and install the SIM card.
- Connect the power supply.
- Set the APN (Access Point Name).
- Restart the sensor using a magnet and verify data reception.
- Perform an actual parking space test.
- Actual Parking Space Test: This involves powering on the device, closing the casing, installing it in a parking space (referencing an Installation Manual not provided here), restarting and initializing it with a magnet, and then observing data reports on the platform as a vehicle drives in and out of the space. This process helps confirm the sensor's functionality in a real-world scenario.
Maintenance Features:
The DO200 incorporates features that simplify maintenance and ensure long-term reliability:
- Parameter Configuration: Key operational parameters can be adjusted via serial port (TTL) commands or a platform. This allows administrators to fine-tune the sensor's behavior to specific environmental conditions or operational requirements, such as modifying detection intervals or alarm thresholds.
- Low Battery Alarm: The automatic low battery alarm (at 20% charge) provides an early warning, enabling proactive battery replacement or recharging before the device ceases to function.
- Self-Calibration: The periodic self-calibration function helps maintain the sensor's accuracy over time by automatically correcting for potential drift or environmental changes, reducing the need for manual recalibration.
- Restart Mechanism: The magnet-based restart mechanism is a simple and effective way to reset the device, which can be useful for troubleshooting or re-initialization without needing to physically access internal components.
- Battery Management Note: The manual advises against frequently plugging and unplugging the battery during restarts, suggesting that the magnet reset is the preferred method. It also recommends disconnecting the battery and capacity when the sensor is not in use to preserve battery life.
In summary, the DO200 Parking Occupation Sensor is a robust and intelligent solution for smart parking systems, offering high accuracy through its dual-sensor technology, flexible configuration, and user-friendly maintenance features. Its NB-IoT connectivity ensures efficient and reliable data transmission, making it suitable for a wide range of smart city applications.
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