I. Project design background and overview
This project is a GPS positioning program based on SLH microcontroller. Through the position coordinates provided by the GPS, in addition to the positioning, the sunrise and sunset times can also be calculated. This time is then used as a basis for control of some timing controllers. For example, street lights, turned on at sunset and closed at sunrise. This can save the trouble of manually switching the lights, and can also save unnecessary power. At the same time, we also added the NRF24LO1 wireless module, which can wirelessly transmit position coordinates, patterns and other data to other devices that match the good address. This can achieve the purpose of multi-purpose, and also save the total cost of the system. For the convenience of use, the display uses the 12864 display, and various menus and mode selections have been added to the program. And parameter setting function. Make it even more powerful.
Second, the project design principle
1, an overview of the principle
The principle of this project is based on the serial communication and IO control functions of SLH single-chip microcomputer, which integrates GPS, RF, DS1302, LCD and other modes into one. Thereby achieving geolocation. Wireless communication. Real Time Clock. And LCD monitors and other functions.
2, the hardware design principle
The hardware schematic is shown below.
Figure 1. Single chip and GPS
In Figure 1, in order to power the RF and LCD, an LDO is used to convert the 5V voltage to 3.3V. GPS uses a 4P plug to facilitate computer serial port debugging. The exclusion is used for the DS1302 pull position mentioned later. High level reset, the crystal oscillator is used at 11.0592MHz.
Figure 2. DS1302 and NRF24L01 
Figure 3. LCD 
Figure 4. Button
Note that the IO of the DS1302 preferably has a pull-up resistor, otherwise it will be a small pit from time to time.
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