Circuit Documentation

Summary

This document provides a detailed overview of a circuit that includes a power supply, a 12V battery, an ESP8266 NodeMCU microcontroller, an LCD I2C module, a buzzer module, and a voltage sensor. The circuit is designed to monitor voltage levels and display them on an LCD, with an alert mechanism using a buzzer.

Component List

1. Power Supply

   • Pins: +, -
   • Description: Provides power to the circuit.

2. 12V Battery

   • Pins: VCC, GND
   • Description: Supplies 12V power to the voltage sensor.

3. ESP8266 NodeMCU

   • Pins: D0, D1, D2, D3, D4, 3V3, GND, D5, D6, D7, D8, RX, TX, A0, RSV, SD3, SD2, SD1, CMD, SD0, CLK, EN, RST, VIN
   • Description: Microcontroller used for processing and control.

4. LCD I2C Module

   • Pins: GND, VCC, SDA, SCL
   • Description: Displays voltage readings.

5. Buzzer Module

   • Pins: GND, Vcc, I/O
   • Description: Provides audible alerts.

6. Voltage Sensor DC 25V

   • Pins: +, -, output, gnd, vcc
   • Description: Measures voltage levels.

Wiring Details

Power Supply

• + connected to VIN of ESP8266 NodeMCU
• - connected to GND of ESP8266 NodeMCU and - of Voltage Sensor DC 25V

12V Battery

• VCC connected to vcc of Voltage Sensor DC 25V
• GND connected to gnd of Voltage Sensor DC 25V

ESP8266 NodeMCU

• VIN connected to + of Power Supply
• GND connected to - of Power Supply and GND of Buzzer Module and GND of LCD I2C Module
• D1 connected to SCL of LCD I2C Module
• D2 connected to SDA of LCD I2C Module
• 3V3 connected to VCC of LCD I2C Module and + of Voltage Sensor DC 25V
• D6 connected to I/O of Buzzer Module
• A0 connected to output of Voltage Sensor DC 25V

LCD I2C Module

• GND connected to GND of ESP8266 NodeMCU
• VCC connected to 3V3 of ESP8266 NodeMCU
• SDA connected to D2 of ESP8266 NodeMCU
• SCL connected to D1 of ESP8266 NodeMCU

Buzzer Module

• GND connected to GND of ESP8266 NodeMCU
• Vcc not connected
• I/O connected to D6 of ESP8266 NodeMCU

Voltage Sensor DC 25V

• + connected to 3V3 of ESP8266 NodeMCU
• - connected to GND of ESP8266 NodeMCU and - of Power Supply
• output connected to A0 of ESP8266 NodeMCU
• gnd connected to GND of 12V Battery
• vcc connected to VCC of 12V 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. The wiring details ensure that each component is correctly connected to achieve the desired functionality.