What exactly is the communication principle of the shared bicycle we often ride, has anyone understood it? The following Baolan Xiaobian will take you to understand.
1. Smart car locks
The core hardware of shared bicycles is the smart lock, which is mainly used to realize control and positioning functions.
An embedded chip (communication module), GPS module and IoT SIM card are integrated into the lock.
By integrating a SIM card with an independent number in the lock, smart lock manufacturers maintain communication capabilities with the cloud through 2G, 3G, and 4G networks, and timely report the vehicle's location (GPS information) and vehicle's current status (lock status or use status) to the cloud.
Second, chip power supply
The bicycle's communication module needs power supply to function. There is a coil device on the bicycle, and the pedal is also rotating the coil to do the cutting magnetic induction line movement, and the bicycle is to charge the battery through the power generation device while pedaling.
3. Scan the code to unlock
Each bicycle has a unique QR code label, the mobile phone opens the APP to scan the code, connects with the bicycle through Bluetooth, and obtains the QR code information of each bicycle, which will be sent to the background management system in the cloud through the mobile phone network. The cloud system sends the unlock command to the communication module of the bicycle, and after receiving the command, the central control unit of the lock will open 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 background management system of WeChat or Alipay on the mobile phone to complete the deduction.
5. Bluetooth module
If the signal of the bicycle is not good in a more remote suburb, the bicycle smart lock chip cannot receive the unlocking instruction of the cloud background, which will lead to unlocking failure.
At this time, it is necessary 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 unlock key to the mobile phone, the mobile phone will pair the key to the electronic lock of the bicycle through Bluetooth, and the chip will start the unlock procedure when the key matches successfully. Since Bluetooth does not need to rely on the network system, and Bluetooth has the characteristics of accuracy and fast speed in short-distance 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 running track of the mobile phone is presented on the map.
The mobile phone must be in the parking point P, the bicycle is in any position, and the car can be locked from a distance;
If the mobile phone is not parked at point P, whether the car is at point P or not, the car cannot be locked;
It may be in urban high-rise areas, some chip platforms will have the problem of GPS positioning inaccuracy, the phenomenon is that the mobile phone is parking at point P, but the location reported by the actual mobile phone is not at point P of parking, causing the Meituan APP to think that the mobile phone is not in the electronic fence area, prompting illegal parking fees;
2. The orange bicycle APP obtains the location of the car for positioning.
When scanning the code to unlock the lock, the distance between the person and the car is more than ten meters, click the APP to confirm the unlock button to open the car, and even enter the number to unlock the lock can be opened;
When the lock is closed, the same person is more than ten meters away from the car, the person next to the car is locked, and the APP at the other end shows the end of the trip at the same time;
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, more connected devices, and lower power consumption, which has become the mainstream of the development of shared bicycles.
Sharp car positioner