Circuit Documentation

Summary

This circuit is designed to control four individual bulbs using an ESP8266 NodeMCU microcontroller and a 4-channel 5V relay module. The ESP8266 NodeMCU is responsible for triggering the relays, which in turn switch the bulbs on and off. The relay module is powered by a 5V adapter, and the bulbs are powered by a 220V power source. The ground connections are shared among the components to complete the circuit.

Component List

ESP8266 NodeMCU

• Description: A Wi-Fi capable microcontroller module based on the ESP8266 chip.
• 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

Relay 4 Channel 5V

• Description: A relay module with four channels that can be controlled independently to switch external circuits.
• Pins: GND, IN1, IN2, IN3, IN4, VCC, COM1, COM2, COM3, COM4, NO1, NO2, NO3, NO4, NC1, NC2, NC3, NC4

5V Adapter

• Description: A power adapter that converts AC voltage to a 5V DC output.
• Pins: AC In 1, AC In 2, 5V, GND

Bulb

• Description: A standard electric bulb that operates at 220V.
• Pins: +, -

Power 220V

• Description: A power source providing 220V AC.
• Pins: Hot wire, Neutral wire

Wiring Details

ESP8266 NodeMCU

• D1 - Connected to Relay 4 Channel 5V IN1
• D2 - Connected to Relay 4 Channel 5V IN2
• D3 - Connected to Relay 4 Channel 5V IN3
• D4 - Connected to Relay 4 Channel 5V IN4
• GND - Shared ground with 5V Adapter and Relay 4 Channel 5V
• VIN - Connected to 5V output from the 5V Adapter

Relay 4 Channel 5V

• GND - Shared ground with ESP8266 NodeMCU
• IN1, IN2, IN3, IN4 - Controlled by ESP8266 NodeMCU D1, D2, D3, D4 respectively
• VCC - Connected to 5V output from the 5V Adapter
• COM1, COM2, COM3, COM4 - Connected to Neutral wire from Power 220V
• NO1, NO2, NO3, NO4 - Connected to the positive (+) pin of each Bulb

5V Adapter

• GND - Shared ground with ESP8266 NodeMCU
• 5V - Connected to VIN of ESP8266 NodeMCU and VCC of Relay 4 Channel 5V

Bulb

• + - Connected to the corresponding NO pin on the Relay 4 Channel 5V
• - - Connected to the Hot wire from Power 220V

Power 220V

• Neutral wire - Connected to COM pins on Relay 4 Channel 5V
• Hot wire - Connected to the negative (-) pin of each Bulb

Documented Code

No code has been provided for the ESP8266 NodeMCU. The expected functionality would include initializing the GPIO pins connected to the relay module and toggling them to control the state of the bulbs. Without the code, we cannot document the specific implementation details or provide a code walkthrough.