CompletedBike Locator -Air780EG
PRO
Bike Locator -Air780EG
License
：GPL 3.0
Description
1. Project Introduction
1.Using the HeZhou Air780EG module, supporting LTE Cat.1 + GNSS communication, supporting Beidou + GPS dual-mode satellite positioning, supporting LBS positioning, with a sleep power consumption of about 10ua, supporting secondary development.
2. The platform supports uploading one's own location information once every 10min-24H, and users can set the sleep time. 500mAh can be used for one month. Users can access the device by themselves after authorization, and support satellite maps and trajectory review.
3. The shell is waterproof and can be installed to any position on the bicycle with straps.
4. More features are supported. It is recommended to use the Air780EP + cheating software GPS solution, which has lower sleep power consumption, more accurate positioning, and supports WIFI positioning.
2.Open source license
Schematics, PCB, and code (Doodle Smart Platform + Genie IoT Access) are completely open source, but individuals are not allowed to create, sell, or resell materials. If you need to use them, please indicate the source.
Latest code address: https://github.com/fairycloudpublic/FairyCloud_AIR780EGRL_PUBLIC
Exchange experience QQ group: 630017549 (Note, Li Chuang Open Source Platform)
3. Function introduction
Apple TAG is based on Bluetooth and requires the use of nearby Apple phones. Huawei TAG is the same. Only independent locators can withstand the test. The 780EG supports Beidou/GPS dual-mode positioning, with a satellite positioning error of about 5 meters and a search time of about 40S (first time).
Positioning difference:
|
GPS/BDS |
Base station |
WIFI |
|
The highest accuracy, only outdoor positioning, small error. |
According to the rough positioning of the base station location of 4g network, the error is the largest. |
Search location by scanning nearby WIFI name, signal strength, BSSID identification information, etc. |
The hardware is relatively simple, and the antenna part is briefly introduced:
780EG supports active and passive GNSS antennas. This project uses active antennas and LAN amplification, with a gain of more than 6 times that of traditional passive antenna signals.
Power switching circuit:
The current on the equipment is large, and power failure may occur when the battery is not connected. Therefore, the following circuit is used to ensure stable power supply
This circuit is a simple power switching circuit, usually used to switch between two power sources to ensure that the device can seamlessly switch to the backup power supply (VBAT) when the main power supply (VCC) fails. Specifically:
Q1 (AO3401A) : This is a P-channel MOSFET. When VCC4 provides voltage, the gate voltage of the MOSFET is lower than the source voltage, the MOSFET is turned on, and the VBAT is connected to the load through the MOSFET.
D1 (SS14) : This is a Schottky diode used to prevent current from flowing back from VBAT to VCC4. When the voltage of VCC4 is higher than VBAT, the Schottky diode is reverse biased, preventing current from flowing.
U2 (1N4007W) : This is a common rectifier diode used to prevent current from flowing back from VCC to VBAT. When the VCC voltage is higher than VBAT, the rectifier diode is forward biased, allowing current to flow from VCC to VBAT.
The working process is as follows:
When VCC4 voltage is normal, MOSFET Q1 is turned on, VBAT is connected to the load through Q1, and the load is powered by VCC4.
When the VCC4 voltage drops or fails, MOSFET Q1 is turned off, and VBAT is connected to the load through D1 and U2, and the load is powered by VBAT.
D1 and U2 ensure that current can only flow from VCC to VBAT, preventing reverse current flow.
4. Introduction to Mini Program Platform:
1. No need to install APP, WeChat Mini Program can be viewed in real time
2. View device battery level, real-time location, historical trajectory, remote control, vector map, etc
3. The platform is built independently, with extremely low latency, meeting the needs of a large number of devices
GPS positioning
LBS positioning (indoor)
WIFI positioning (only 780EP)
Real-time, historical trajectory
5. Deployment and use:
Software environment configuration - see previous project
Own Cloud as a Service
Directly modify projectConfig.lua in the Code to complete, supporting four platforms
Choose one of the following four, and then start configuring
-- ① fairycloud
-- ② Alibaba Cloud Ali Cloud Aliyun aliyuncs
-- ③OneNET onenet
Build your own server privatecloud
Serverless
Provide firmware, burn it yourself and start using it without configuration modification
6. Demonstration video:
Designed by 智能制造工作室 (from OSHWHub)
Design Drawing
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