Circuit Documentation

Summary

This document provides a detailed overview of a circuit that includes an ESP32 microcontroller, various sensors, a battery charger, a buck converter, a 3.7V battery, and a solar panel. The circuit is designed to monitor voltage and current, charge a battery using solar power, and provide regulated power to the ESP32 and sensors.

Component List

1. ESP32 (30 pin)

   • Description: A versatile microcontroller with Wi-Fi and Bluetooth capabilities.
   • Pins: EN, VP, VN, D34, D35, D32, D33, D25, D26, D27, D14, D12, D13, GND, Vin, D23, D22, TX0, RX0, D21, D19, D18, D5, TX2, RX2, D4, D2, D15, 3V3

2. Voltage Sensor DC 25V

   • Description: A sensor to measure voltage up to 25V.
   • Pins: +, -, output, gnd, vcc

3. Battery Charger 4.2V

   • Description: A charger for 4.2V batteries.
   • Pins: OUT+, OUT-, B+, B-, IN+, IN-

4. Buck Converter

   • Description: A DC-DC converter to step down voltage.
   • Pins: IN+, IN-, OUT+, OUT-

5. 3.7V Battery

   • Description: A rechargeable 3.7V battery.
   • Pins: +, -

6. Solar Panel

   • Description: A solar panel to provide power.
   • Pins: +, -

7. Current Sensor 5A

   • Description: A sensor to measure current up to 5A.
   • Pins: 1, 2, GND, OUT, VCC

Wiring Details

ESP32 (30 pin)

• D34 is connected to OUT of the Current Sensor 5A.
• D35 is connected to output of the Voltage Sensor DC 25V.
• GND is connected to GND of the Current Sensor 5A and - of the Voltage Sensor DC 25V.
• 3V3 is connected to VCC of the Current Sensor 5A and + of the Voltage Sensor DC 25V.

Voltage Sensor DC 25V

• output is connected to D35 of the ESP32 (30 pin).
• - is connected to GND of the Current Sensor 5A and GND of the ESP32 (30 pin).
• + is connected to 3V3 of the ESP32 (30 pin) and VCC of the Current Sensor 5A.
• gnd is connected to B- of the Battery Charger 4.2V and - of the 3.7V Battery.
• vcc is connected to B+ of the Battery Charger 4.2V and + of the 3.7V Battery.

Battery Charger 4.2V

• B- is connected to - of the 3.7V Battery and gnd of the Voltage Sensor DC 25V.
• B+ is connected to 1 of the Current Sensor 5A, + of the 3.7V Battery, and vcc of the Voltage Sensor DC 25V.
• IN+ is connected to OUT+ of the Buck Converter.
• IN- is connected to OUT- of the Buck Converter.

Buck Converter

• IN+ is connected to + of the Solar Panel.
• IN- is connected to - of the Solar Panel.
• OUT+ is connected to IN+ of the Battery Charger 4.2V.
• OUT- is connected to IN- of the Battery Charger 4.2V.

3.7V Battery

• + is connected to B+ of the Battery Charger 4.2V, 1 of the Current Sensor 5A, and vcc of the Voltage Sensor DC 25V.
• - is connected to B- of the Battery Charger 4.2V and gnd of the Voltage Sensor DC 25V.

Solar Panel

• + is connected to IN+ of the Buck Converter.
• - is connected to IN- of the Buck Converter.

Current Sensor 5A

• OUT is connected to D34 of the ESP32 (30 pin).
• GND is connected to GND of the ESP32 (30 pin) and - of the Voltage Sensor DC 25V.
• VCC is connected to 3V3 of the ESP32 (30 pin) and + of the Voltage Sensor DC 25V.
• 1 is connected to B+ of the Battery Charger 4.2V and + of the 3.7V Battery.

Code

No code is provided for this circuit.

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This document provides a comprehensive overview of the circuit, including a summary, component list, wiring details, and code documentation. Each section is designed to help understand the purpose and connections of each component in the circuit.