Does anyone know the communication principle of the shared bicycles we ride every day?

• 1. Smart car lock
• 2. Chip power supply
• 3. Scan code to unlock
• 4. Payment system
• 5. Bluetooth module
• 6. GPS positioning
• 7. Internet of Things Technology

What is the communication principle of the shared bicycles we often ride? Does anyone understand it? Below, the Baolan editor will take you through it.

1. Smart car lock

The core hardware of shared bicycles is the smart lock, which is mainly used to implement control and positioning functions.

The car lock integrates an embedded chip (communication module), GPS module and IoT SIM card.

Smart lock manufacturers integrate a SIM card with an independent number into the lock, maintain communication capabilities with the cloud through 2G, 3G, and 4G networks, and promptly report the vehicle's location (GPS information) and vehicle's current status (locked status or use status) ) report to the cloud.

2. Chip power supply

The communication module of the bicycle requires power to work. There is a coil device on the bicycle. When the pedal is turned, the coil is also rotated to cut the magnetic field lines. The bicycle relies on pedaling and at the same time charges the battery through the power generation device.

3. Scan code to unlock

Each bicycle has a unique QR code label. Open the APP on your mobile phone to scan the code and connect to the bicycle through Bluetooth. After obtaining the QR code information of each bicycle, it will be sent to the cloud backend management system through the mobile phone network. The cloud system sends the unlocking instruction to the communication module of the bicycle. After receiving the instruction, the central control unit of the bicycle lock will turn on the electromechanical locking device.

4. Payment system

The cloud platform management terminal calculates the usage time of the bicycle through the unlocking and locking time, matches the corresponding deduction amount, and connects with the backend management system of WeChat or Alipay on the mobile phone to complete the deduction.

5. Bluetooth module

Shared bicycles that communicate between the SIM card and the cloud backend require network operators to provide services. If the signal of the bicycle is not good in a relatively remote suburb, the smart bicycle lock chip cannot receive the unlocking instructions from the cloud backend, resulting in unlocking failure.

At this time, you need to use Bluetooth communication. The cloud server scans the QR code through the mobile phone APP to obtain the bicycle information. The server will send the bicycle unlocking key to the mobile phone, and the mobile phone will pair the key with the electronic lock of the bicycle through Bluetooth. Once the key is successfully matched, the chip will start the unlocking process. Since Bluetooth does not need to rely on the network system, and Bluetooth has the characteristics of accuracy and speed in short-range transmission, the success rate of unlocking will be faster than that of network unlocking.

6. GPS positioning

1. The Meituan Bicycle APP obtains the location of the mobile phone in real time, and the map shows the movement trajectory of the mobile phone.

The mobile phone must be at parking point P. The bicycle can be locked remotely at any location;

If the mobile phone is not at parking point P, the car cannot be locked regardless of whether the car is at point P or not;

Maybe in urban high-rise areas, some chip platforms may have inaccurate GPS positioning. The phenomenon is that the mobile phone is at the parking point P, but the actual location reported by the mobile phone is not at the parking point P. This causes the Meituan APP to think that the mobile phone is not in the electronic fence area and prompts for illegal parking. deduction;

2. Qingju Bicycle APP obtains the location of the bike for positioning.

When scanning the code to unlock, if the person is more than ten meters away from the car, the car can be opened by clicking the confirm unlock button on the APP, or even by entering the number to unlock;

When the car is locked, the same person is more than ten meters away from the car, and the person next to the car closes the car, and the other end of the APP simultaneously displays the end of the trip;

7. Internet of Things Technology

The Internet of Things technology in shared bicycles is mainly divided into three types: 2G communication module, Bluetooth, and NB-IOT.

The advantages of NB-IOT are wider coverage, connection to more devices, and lower power consumption, making it the mainstream in the development of shared bicycles.

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