Circuit Documentation

Summary

This document provides a detailed overview of a circuit designed to interface various components including microcontrollers, a microphone amplifier, LEDs, switches, a battery charging module, and a TFT LCD screen. The circuit is powered by 3.7v LiPo batteries and includes charging modules for battery management. The Wemos S2 Mini and Wemos D1 Mini microcontrollers serve as the central processing units, interfacing with the microphone amplifiers and LEDs. The ESP 32 DEVKIT V1 microcontroller drives the LCD TFT screen ILI9488 HD. Toggle and rocker switches are used to control power flow within the circuit.

Component List

Microcontrollers

• Wemos D1 Mini: A compact microcontroller based on the ESP-8266EX.
• Wemos S2 Mini: A small form-factor microcontroller featuring the ESP32-S2FN4R2 chip.
• ESP 32 DEVKIT V1 (30 pins): A development board with an ESP32 chip, suitable for various IoT applications.

Sensors and Modules

• Adafruit MAX4466 Electret Microphone Amplifier: An amplifier module designed for use with electret microphones, providing adjustable gain.

Power Components

• 3.7v LiPo Battery: A rechargeable lithium polymer battery providing a power source for the circuit.
• TP4056 Battery Charging Protection Module (Type C): A module for charging lithium batteries and providing protection against overcharging.

Display

• LCD TFT screen ILI9488 HD: A color display with a resolution suitable for graphics and text.

Indicators

• LED: Two Pin (green): A green LED used as an indicator light.
• LED: Two Pin (red): A red LED used as an indicator light.

Switches

• Toggle Switch: A switch that can connect or disconnect the circuit, changing the state between on and off.
• Rocker Switch: A type of on/off switch that rocks when pressed.

Wiring Details

Wemos S2 Mini

• 3.3V connected to Adafruit MAX4466 Electret Microphone Amplifier (VCC) and LED (green, anode).
• GPIO 1 connected to Adafruit MAX4466 Electret Microphone Amplifier (OUT).
• VBUS connected to Toggle Switch (L2).
• GND connected to Adafruit MAX4466 Electret Microphone Amplifier (GND) and LED (green, cathode).
• GND connected to TP4056 Battery Charging Protection Module (OUT -).

Wemos D1 Mini

• 3V3 connected to Adafruit MAX4466 Electret Microphone Amplifier (VCC) and LED (red, anode).
• 5V connected to Toggle Switch (L2).
• G connected to Adafruit MAX4466 Electret Microphone Amplifier (GND), TP4056 Battery Charging Protection Module (OUT -), and LED (red, cathode).
• D1 connected to Adafruit MAX4466 Electret Microphone Amplifier (OUT).

ESP 32 DEVKIT V1 (30 pins)

• VN connected to LCD TFT screen ILI9488 HD (BL).
• GND connected to TP4056 Battery Charging Protection Module (OUT -) and LCD TFT screen ILI9488 HD (GND).
• VIN connected to Rocker Switch (1).
• 3V3 connected to LCD TFT screen ILI9488 HD (VCC (3.3~5V)).
• D15 connected to LCD TFT screen ILI9488 HD (CS).
• D2 connected to LCD TFT screen ILI9488 HD (RST).
• D4 connected to LCD TFT screen ILI9488 HD (D/C).
• D18 connected to LCD TFT screen ILI9488 HD (SDI(MOSI)).
• D23 connected to LCD TFT screen ILI9488 HD (SCK).

Adafruit MAX4466 Electret Microphone Amplifier

• VCC connected to Wemos S2 Mini (3.3V) and Wemos D1 Mini (3V3).
• GND connected to Wemos S2 Mini (GND), Wemos D1 Mini (G), and TP4056 Battery Charging Protection Module (OUT -).
• OUT connected to Wemos S2 Mini (GPIO 1) and Wemos D1 Mini (D1).

TP4056 Battery Charging Protection Module (Type C)

• OUT + connected to Toggle Switch (COM) and Rocker Switch (2).
• B+ connected to 3.7v LiPo Battery (+Ve).
• B- connected to 3.7v LiPo Battery (GND).
• OUT - connected to Wemos S2 Mini (GND), Wemos D1 Mini (G), and Adafruit MAX4466 Electret Microphone Amplifier (GND).

LED: Two Pin (green)

• anode connected to Wemos S2 Mini (3.3V).
• cathode connected to Wemos S2 Mini (GND).

LED: Two Pin (red)

• anode connected to Wemos D1 Mini (3V3).
• cathode connected to Wemos D1 Mini (G).

Toggle Switch

• L2 connected to Wemos S2 Mini (VBUS) and Wemos D1 Mini (5V).
• COM connected to TP4056 Battery Charging Protection Module (OUT +).

Rocker Switch

• 1 connected to ESP 32 DEVKIT V1 (VIN).
• 2 connected to TP4056 Battery Charging Protection Module (OUT +).

LCD TFT screen ILI9488 HD

• VCC (3.3~5V) connected to ESP 32 DEVKIT V1 (3V3).
• GND connected to ESP 32 DEVKIT V1 (GND).
• CS connected to ESP 32 DEVKIT V1 (D15).
• RST connected to ESP 32 DEVKIT V1 (D2).
• D/C connected to ESP 32 DEVKIT V1 (D4).
• SDI(MOSI) connected to ESP 32 DEVKIT V1 (D18).
• SCK connected to ESP 32 DEVKIT V1 (D23).
• BL connected to ESP 32 DEVKIT V1 (VN).

Documented Code

No code has been provided for the microcontrollers in the circuit. If code is available, it should be documented here with appropriate comments and explanations for each section of the code.