Application of ZigBee Long-Range Positioning in Automatic Bus Stop Announcement for Smart Public Transportation

I. Overview of the Bus Project Background

A company under China Electronics Technology Group Corporation (CETC) has undertaken a smart bus transformation project. The existing bus automatic stop announcement system primarily relies on satellite positioning to determine bus coordinates and issues announcement commands based on these coordinates. However, satellite signals are susceptible to interference from variable environmental conditions, leading to inaccurate positioning and occasional signal drift errors. This can result in weakened or lost satellite signals, causing misreports or missed reports when relying solely on satellite positioning. Our company's ZigBee positioning solution is required to enhance the accuracy and stability of tag reading, thereby compensating for the shortcomings of satellite positioning.

II. West-HN ZigBee-Based Positioning Solution

Install one 4G network card reader at each bus stop.
Install one solar-powered electronic tag on each bus.
While the bus is in motion, its position is tracked via satellite. When the bus approaches within approximately 100 meters of a bus stop, the card reader fixed at the stop immediately reads the signal from the tag attached to the bus and automatically reports it to the bus dispatch system via 4G.
The dispatch system issues commands based on the reported data to the bus announcement system for automatic stop announcements.

III. Logic Diagram for ZigBee-Based Real-Time Monitoring is Shown Below

IV. Product Application Introduction

Active Card Reading Antenna (WE-TX20)

Can simultaneously detect up to 500 electronic tags, with a detection range of up to 150 meters in open areas.
Measures the wireless signal field strength of electronic tags to calculate the actual distance of the tags.
Can simultaneously call 10 tags for audible and visual alerts (applicable only to tags with audio/visual features).
Communicates with other devices using an RS232 asynchronous serial port, with configurable baud rates.
Provides open communication protocols, facilitating user integration of the antenna into their own control equipment.
Outdoor waterproof design; antenna feeder cable can be extended up to 50 meters (at 9600 bps).
Includes an antenna-to-USB evaluation board for connection to a computer, running open-source software to search for nearby tags.
Low-power device, with power consumption not exceeding 1 watt.
Easy and secure installation using 3M adhesive tape or wall mounting via gourd-shaped holes.
Multiple antennas working in coordination enable effective tag positioning.

Electronic Tag Reading Antenna WE-TX20
¥270
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Solar-Powered Electronic Tag (WE-T78)

Wireless transmission power of 100mW, with a transmission range of up to 300 meters in open areas.
Utilizes the globally open 4GHz microwave frequency band, requiring no application or fees.
Solar panel charging current: 60mA on sunny days, 4mA on cloudy/rainy days.
Tag transmits once per second, with an average current draw of less than 1mA, allowing continuous charging even on cloudy/rainy days.
Built-in 120mAH small battery, capable of continuous operation for 120 hours in dark environments.
Features low-voltage alert; after depletion, 2 hours of sunlight restores full charge.
Under low voltage, the tag operates in slow mode, transmitting once every 5 seconds.
IP67 waterproof rating, can withstand prolonged outdoor rain and short-term submersion in water.
Dimensions: Rectangular prism, 83mm x 58mm x 36mm.
Operating temperature: -40℃ to 70℃.

Asset Positioning Solar-Powered Electronic Tag WE-T78
¥68
Add to Cart

Full-Network 4G CAT1 DTU (WE-D541)

Wide voltage power supply: 9~36V.
Software and hardware watchdog protection.
Supports both RS232 and RS485 interfaces.
RS232 port can output 5V to power the WE-TX20.
Supports 4-channel Socket transparent transmission.
Supports empty packet data filtering; empty packets are not reported via 4G.
Supports TCP/UDP/HTTP/MQTT/Peer-to-Peer transmission/SMS transparent transmission.
Supports offline data caching.
Hardware reliability: Reverse connection protection, ESD level 4.
Supports local and remote firmware upgrades.
Supports AT commands via serial port, network, and SMS.
Reserves two IO functions, customizable as dual input, dual output, or 1 input + 1 output.

V. About Hainan West-HN Technology Co., Ltd.

Hainan West-HN Technology Co., Ltd. envisions "making standardization in industrial IoT simpler." Focusing on the IoT industry chain, we continuously conduct R&D in indoor positioning, sensor control, and data transmission products. We adopt a "Lego-like" production approach to precisely meet the diverse yet small-batch demand characteristics of industrial IoT products. We provide solutions for complex environments and personalized needs, truly achieving a new supply-demand relationship with low inventory and high satisfaction.

The company has R&D centers in Shanghai, Suzhou, Chengdu, and Taipei. Upholding the group's nearly 40 years of strong commercial resources and reputation, we firmly believe in the business philosophy of "being experts in the industry." We excel in channels, are sensitive to the market, focus on products, ensure reliability in R&D, stability in production, and quality in sales. We are consistently dedicated to the ultimate satisfaction of personalized scenario requirements for industrial IoT customers.

Regarding products, we have Zigbee positioning products developed by our in-house team over more than 10 years, as well as UWB positioning products developed by teams in Shanghai and Taipei, meeting different customer needs for positioning accuracy. Simultaneously, the company introduces Bluetooth positioning products to complement our self-developed solutions, aiming to comprehensively satisfy the needs of various customers.

In terms of software support, we integrate overall solutions across industries, actively opening interfaces and source code for system integrators to join. This facilitates related software companies in creating case demonstrations based on our products, broadening the application of IoT indoor positioning.

Website Editor-in-Chief: Wu Liying (Ameko Wu)

Content Reviewer: Yao Pinggui (Jimme Yao)

Professional IoT solution equipment supplier

I. Overview of the Bus Project Background

II. West-HN ZigBee-Based Positioning Solution

III. Logic Diagram for ZigBee-Based Real-Time Monitoring is Shown Below