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Battery-Powered ESP32 Devkit V1 with Buck Converter and Switch Control

Image of Battery-Powered ESP32 Devkit V1 with Buck Converter and Switch Control

Circuit Documentation

Summary

This document provides a detailed overview of a circuit that includes a power supply, switches, a buck converter, and an ESP32 microcontroller. The circuit is designed to manage power distribution and control using various switches and a DC-DC buck converter to step down voltage. The ESP32 microcontroller is included for potential control and monitoring tasks.

Component List

  1. 18650 Li-ion Battery x 2

    • Pins: +, -
    • Description: Provides the primary power source for the circuit.
    • Purpose: Supplies power to the entire circuit.
  2. Rocker Switch

    • Pins: 1, 2
    • Description: A simple on/off switch.
    • Purpose: Controls the connection between the battery and the buck converter.
  3. Toggle Switch

    • Pins: L1, COM, L2
    • Description: A switch that can toggle between two positions.
    • Purpose: Selects the input to the buck converter.
  4. LM2956 Buck Converter DC-DC

    • Pins: OUT+, OUT-, IN+, IN-
    • Description: A DC-DC converter that steps down voltage.
    • Purpose: Converts the battery voltage to a lower voltage suitable for the ESP32 and other components.
  5. ESP32 Devkit V1

    • Pins: 3V3, GND, D15, D2, D4, RX2, TX2, D5, D18, D19, D21, RX0, TX0, D22, D23, EN, VP, VN, D34, D35, D32, D33, D25, D26, D27, D14, D12, D13, VIN
    • Description: A microcontroller with Wi-Fi and Bluetooth capabilities.
    • Purpose: Provides control and monitoring capabilities for the circuit.
  6. Micro USB to Cable (2 Pin)

    • Pins: Micro USB, +, -
    • Description: A cable to connect the circuit to a USB power source.
    • Purpose: Provides an alternative power input to the circuit.

Wiring Details

18650 Li-ion Battery x 2

  • + Pin:
    • Connected to COM pin of the Toggle Switch.
  • - Pin:
    • Connected to 2 pin of the Rocker Switch.

Rocker Switch

  • 1 Pin:
    • Connected to IN- pin of the LM2956 Buck Converter DC-DC.
  • 2 Pin:
    • Connected to - pin of the 18650 Li-ion Battery x 2.

Toggle Switch

  • COM Pin:
    • Connected to + pin of the 18650 Li-ion Battery x 2.
  • L1 Pin:
    • Connected to IN+ pin of the LM2956 Buck Converter DC-DC.

LM2956 Buck Converter DC-DC

  • IN+ Pin:
    • Connected to L1 pin of the Toggle Switch.
  • IN- Pin:
    • Connected to 1 pin of the Rocker Switch.
  • OUT+ Pin:
    • Connected to + pin of the Micro USB to Cable (2 Pin).
  • OUT- Pin:
    • Connected to - pin of the Micro USB to Cable (2 Pin).

Micro USB to Cable (2 Pin)

  • + Pin:
    • Connected to OUT+ pin of the LM2956 Buck Converter DC-DC.
  • - Pin:
    • Connected to OUT- pin of the LM2956 Buck Converter DC-DC.

ESP32 Devkit V1

  • VIN Pin:
    • Not connected in this circuit.
  • GND Pin:
    • Not connected in this circuit.
  • Other Pins:
    • Not connected in this circuit.

Code

There is no code provided for the microcontrollers in this circuit.


This documentation provides a comprehensive overview of the circuit, including a summary, detailed component list, wiring details, and code documentation. This should serve as a useful reference for understanding and replicating the circuit.