Circuit Documentation
Summary
This circuit integrates a GSM/GPRS+GPS/BDS module, a solar cell charging system, a voltage regulator, a microcontroller, and a pushbutton. The primary function of this circuit is to provide a development platform for GSM/GPRS+GPS/BDS communication, powered by a solar cell with a battery backup system. The Seeeduino XIAO microcontroller serves as the central processing unit, interfacing with the Ai Thinker A9G development board for cellular and GPS functionalities. The pushbutton provides user input capability. The TP4056 module manages the charging of the 3.3V battery from the solar cell, and the 3.3V regulator ensures a stable voltage supply to the microcontroller.
Component List
Ai Thinker A9G GSM/GPRS+GPS/BDS Development Board
- GSM/GPRS+GPS/BDS module for cellular communication and location tracking.
- Pins: MIC+, MIC-, VBAT, GND, VUSB/5V, RST, PWR_KEY, HST_RX, HST_TX, IO7, and more.
Solar Cell
- Converts solar energy into electrical energy.
- Pins: GND, VOUT
TP4056
- Lithium battery charger and protection module.
- Pins: IN-, IN+, OUT+, B+, B-, OUT-
3.3V Battery
- Provides power to the circuit.
- Pins: +, -
3.3V Regulator
- Regulates input voltage to a stable 3.3V output.
- Pins: GND, OUT, Vin
Seeeduino XIAO
- Compact microcontroller for controlling the circuit.
- Pins: A0 - D0 - DAC, A1 - D1, A2 - D2, A3 - D3, A4 - D4 - SDA, and more.
Pushbutton
- User input device.
- Pins: Pin 3 (out), Pin 4 (out), Pin 1 (in), Pin 2 (in)
Wiring Details
Ai Thinker A9G GSM/GPRS+GPS/BDS Development Board
- IO0 connected to Seeeduino XIAO A1 - D1
- IO1 connected to Seeeduino XIAO A0 - D0 - DAC
- GND connected to common ground net
- VBAT connected to 3.3V battery +
- IO25 connected to Seeeduino XIAO A2 - D2
Solar Cell
- GND connected to common ground net
- VOUT connected to TP4056 IN+
TP4056
- IN- connected to Solar Cell GND
- IN+ connected to Solar Cell VOUT
- B+ connected to 3.3V battery +
- B- connected to common ground net
3.3V Battery
-
- connected to TP4056 B+ and 3.3V regulator Vin
-
- connected to common ground net
3.3V Regulator
- GND connected to common ground net
- OUT connected to Seeeduino XIAO 3V3
- Vin connected to 3.3V battery +
Seeeduino XIAO
- A1 - D1 connected to Ai Thinker A9G IO0
- A0 - D0 - DAC connected to Ai Thinker A9G IO1
- GND connected to common ground net
- 3V3 connected to 3.3V regulator OUT
- A2 - D2 connected to Ai Thinker A9G IO25
- A3 - D3 connected to Pushbutton Pin 2 (in)
Pushbutton
- Pin 3 (out) connected to common ground net
- Pin 2 (in) connected to Seeeduino XIAO A3 - D3
Documented Code
No code has been provided for the microcontrollers in the circuit. When code becomes available, it should be documented in this section with appropriate comments and explanations for each function and routine.