1. Design requirements and goals
This system consists of STC89C52 single-chip microcomputer circuit + GPS module circuit + GSM module SIM800A + indicator light circuit + power supply circuit.
1. After the system is powered on, it sends a text message to a specific mobile phone number. The content of the text message is the current latitude and longitude information of the system. It is sent every 40 seconds.
2. If you need to send the latitude and longitude information immediately, just press the onboard button to send the latitude and longitude data immediately without waiting for 40 seconds.
3. The SMS sending and initialization are indicated by status indicator lights.
4. The GSM module is SIM800A, which is fully compatible with the SIM900A circuit program and has the same appearance.
2. Design ideas and solutions
The specific block diagram of this system is shown below:
The hardware circuit is as follows:
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