Circuit Documentation

Summary

The circuit in question appears to be a complex system involving various sensors, a microcontroller, relay modules, and other components. The primary controller is an ESP32 microcontroller, which interfaces with a PZEM004t power monitoring module, multiple flush switches, bulbs, an LCD display with I2C interface, a fan, a 4-channel relay module, a VC-02 module, a current sensor, an MQ2 gas sensor, a SW-420 vibration sensor, and a KY-026 flame sensor. The circuit is designed to monitor and control different environmental parameters and devices, likely for a smart home or industrial automation system.

Component List

PZEM004t

• Power monitoring module
• Pins: VCC, RX, TX, GND, IN, OUT

Flush Switch

• A simple on/off switch
• Pins: GND, VCC

Bulb

• An electric light bulb
• Pins: GND, power

ESP32 (30 pin)

• A microcontroller with WiFi 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

Power 220v

• Mains power supply
• Pins: hot wire, neutral wire

Lcd 20x4 i2c

• An LCD display with an I2C interface
• Pins: GND, 5v, SCA, SCL

Fan

• An electric fan
• Pins: GND, 5V

Relay 4 Channel 5v

• A 4-channel relay module for controlling high power devices
• Pins: GND, IN1, IN2, IN3, IN4, VCC, COM1, COM2, COM3, COM4, NO1, NO2, NO3, NO4, NC1, NC2, NC3, NC4

VC-02 Module

• A communication module
• Pins: NC, TCK OR IOB0, TMS OR IOB1, GND, Vcc, DAC_L, DAS_R, 3.3V O, SDA_5V, SCL_5V, SDA OR IOB3, SCL OR IOB2, IOA27, IOB8, RX(IOB6), TX(IOB7)

Current Sensor

• A sensor for measuring electric current
• Pins: Out, Burden, In_current, Out_current

MQ2

• A gas sensor for detecting LPG, propane, hydrogen, and more
• Pins: VCC, GND, AOUT, DOUT

SW-420 Vibration Sensor

• A sensor for detecting vibrations
• Pins: vcc, Ground, Digital output

KY-026 Flame Sensor

• A sensor for detecting flames
• Pins: AO, GND, VCC, DO

Wiring Details

PZEM004t

• VCC: Connected to the 5V power rail
• RX: Connected to TX2 of ESP32
• TX: Connected to RX2 of ESP32
• GND: Connected to the ground rail
• IN: Connected to the Out_current of the current sensor
• OUT: Connected to the NO4, COM1, COM2, COM3 of the Relay 4 Channel 5v

Flush Switch

• GND: Connected to the ground rail
• VCC: Connected to the 5V power rail and various pins on the ESP32 (D27, D14, D12, D13)

Bulb

• GND: Connected to NO1 and NO2 of the Relay 4 Channel 5v
• Power: Connected to the hot wire of the power 220v and In_current of the current sensor

ESP32 (30 pin)

• Vin: Connected to the 5V power rail
• GND: Connected to the ground rail
• TX2: Connected to RX of PZEM004t
• RX2: Connected to TX of PZEM004t
• D33: Connected to DO of KY-026 Flame Sensor
• D25: Connected to Digital output of SW-420 Vibration Sensor
• D26: Connected to DOUT of MQ2
• D27: Connected to VCC of a Flush Switch
• D14: Connected to VCC of a Flush Switch
• D12: Connected to VCC of a Flush Switch
• D13: Connected to VCC of a Flush Switch
• D22: Connected to SCL of Lcd 20x4 i2c
• TX0: Connected to TX(IOB7) of VC-02 Module
• RX0: Connected to RX(IOB6) of VC-02 Module
• D21: Connected to SCA of Lcd 20x4 i2c
• D5: Connected to IN4 of Relay 4 Channel 5v
• D4: Connected to IN3 of Relay 4 Channel 5v
• D2: Connected to IN2 of Relay 4 Channel 5v
• D15: Connected to IN1 of Relay 4 Channel 5v

Power 220v

• Neutral wire: Connected to COM4 of Relay 4 Channel 5v
• Hot wire: Connected to power of bulbs, In_current of the current sensor, and 5V of the fan

Lcd 20x4 i2c

• GND: Connected to the ground rail
• 5v: Connected to the 5V power rail
• SCA: Connected to D21 of ESP32
• SCL: Connected to D22 of ESP32

Fan

• GND: Connected to NO3 of Relay 4 Channel 5v
• 5V: Connected to the hot wire of the power 220v

Relay 4 Channel 5v

• GND: Connected to the ground rail
• VCC: Connected to the 5V power rail
• IN1: Connected to D15 of ESP32
• IN2: Connected to D2 of ESP32
• IN3: Connected to D4 of ESP32
• IN4: Connected to D5 of ESP32
• COM1, COM2, COM3: Connected to OUT of PZEM004t
• COM4: Connected to neutral wire of power 220v
• NO1: Connected to GND of bulb
• NO2: Connected to GND of another bulb
• NO3: Connected to GND of the fan
• NO4: Connected to OUT of PZEM004t

VC-02 Module

• GND: Connected to the ground rail
• Vcc: Connected to the 5V power rail
• TX(IOB7): Connected to TX0 of ESP32
• RX(IOB6): Connected to RX0 of ESP32

Current Sensor

• Out: Connected to OUT of PZEM004t
• Burden: Connected to IN of PZEM004t
• In_current: Connected to power of the bulbs
• Out_current: Connected to IN of PZEM004t

MQ2

• VCC: Connected to the 5V power rail
• GND: Connected to the ground rail
• AOUT: Not connected
• DOUT: Connected to D26 of ESP32

SW-420 Vibration Sensor

• vcc: Connected to the 5V power rail
• Ground: Connected to the ground rail
• Digital output: Connected to D25 of ESP32

KY-026 Flame Sensor

• AO: Not connected
• GND: Connected to the ground rail
• VCC: Connected to the 5V power rail
• DO: Connected to D33 of ESP32

Documented Code

No code was provided for the microcontrollers in the circuit. Therefore, this section is left blank until the relevant code is supplied.