Circuit Documentation

Summary

This circuit is designed to control a humidifier, UV-C LED, and fans using an Arduino UNO and an ESP32 microcontroller. The Arduino UNO is responsible for controlling a 5V 8-channel relay module, which in turn powers the humidifier, UV-C LED, and fans in a specific sequence. The ESP32 is used to interface with a 3.5" TFT LCD Shield for display purposes. Power is supplied by a 12V 200Ah battery and regulated using an LM2596 step-down module.

Component List

1. Fan

   • Pins: GND, 5V
   • Description: A fan used for ventilation.

2. Humidifier

   • Pins: GND, 5V
   • Description: A device used to add moisture to the air.

3. 5V 8-Channel Relay

   • Pins: GND, IN1, IN2, IN3, IN4, IN5, IN6, IN7, IN8, VCC, NC, C, NO
   • Description: A relay module used to control multiple devices.

4. UV-C LED

   • Pins: +, -
   • Description: A UV-C LED used for sterilization.

5. LM2596 Step Down Module

   • Pins: OUT-, OUT+, IN-, IN+
   • Description: A step-down voltage regulator.

6. ESP32

   • Pins: EN, VP, VN, D34, D35, D32, D33, D25, D26, D27, D14, D12, D13, GND, VIN, 3V3, D15, D2, D4, RX2, TX2, D5, D18, D19, D21, RX0, TX0, D22, D23, BOOT
   • Description: A microcontroller with Wi-Fi and Bluetooth capabilities.

7. 3.5" TFT LCD Shield (320 x 480)

   • Pins: SD_SCK, SD_DO, SD_DI, SD_SS, LCD_D1, LCD_D0, LCD_D7, LCD_D6, LCD_D5, LCD_D4, LCD_D3, LCD_D2, F_CS, LCD_RST, LCD_CS, LCD_RS, LCD_WR, LCD_RD, GND, 5V, 3.3V, RESET
   • Description: A display shield for visual output.

8. MW LRS-350-48

   • Pins: +48V output, -48V output, GND, N, L
   • Description: A power supply unit.

9. 12V 200Ah Battery

   • Pins: GND, 12V
   • Description: A battery for power supply.

10. Arduino UNO

    • Pins: UNUSED, IOREF, Reset, 3.3V, 5V, GND, Vin, A0, A1, A2, A3, A4, A5, SCL, SDA, AREF, D13, D12, D11, D10, D9, D8, D7, D6, D5, D4, D3, D2, D1, D0
    • Description: A microcontroller board based on the ATmega328P.

11. Power Jack

    • Pins: vcc, gnd
    • Description: A power jack for connecting external power.

12. Micro USB to Cable (2 Pin)

    • Pins: Micro USB, +, -
    • Description: A cable for connecting micro USB to other components.

Wiring Details

Fan

• GND connected to 5V 8-Channel Relay (C)
• 5V connected to 5V 8-Channel Relay (NO)

Humidifier

• GND connected to 5V 8-Channel Relay (C)
• 5V connected to 5V 8-Channel Relay (NO)

5V 8-Channel Relay

• GND connected to Arduino UNO (GND) and ESP32 (GND)
• IN1 connected to Arduino UNO (D2)
• IN2 connected to Arduino UNO (D3)
• IN3 connected to Arduino UNO (D4)
• IN4 connected to Arduino UNO (D5)
• IN5 connected to Arduino UNO (D6)
• VCC connected to Arduino UNO (5V)
• C connected to Humidifier (GND), UV-C LED (-), Fan (GND)
• NO connected to Humidifier (5V), UV-C LED (+), Fan (5V)

UV-C LED

• - connected to 5V 8-Channel Relay (C)
• + connected to 5V 8-Channel Relay (NO)

LM2596 Step Down Module

• OUT- connected to Power Jack (gnd) and Micro USB to Cable (2 Pin) (-)
• OUT+ connected to Power Jack (vcc) and Micro USB to Cable (2 Pin) (+)
• IN- connected to MW LRS-350-48 (-48V output)
• IN+ connected to MW LRS-350-48 (+48V output)

ESP32

• GND connected to Arduino UNO (GND) and 3.5" TFT LCD Shield (GND)
• 3V3 connected to Arduino UNO (3.3V) and 3.5" TFT LCD Shield (3.3V)
• RX0 connected to Arduino UNO (D1)
• TX0 connected to Arduino UNO (D0)
• D15 connected to 3.5" TFT LCD Shield (LCD_CS)
• D2 connected to 3.5" TFT LCD Shield (LCD_RS)
• D4 connected to 3.5" TFT LCD Shield (LCD_RST)
• D5 connected to 3.5" TFT LCD Shield (SD_SS)
• D18 connected to 3.5" TFT LCD Shield (SD_SCK)
• D19 connected to 3.5" TFT LCD Shield (SD_DO)
• D21 connected to 3.5" TFT LCD Shield (LCD_RD)
• D22 connected to 3.5" TFT LCD Shield (LCD_WR)
• D23 connected to 3.5" TFT LCD Shield (SD_DI)

3.5" TFT LCD Shield (320 x 480)

• 3.3V connected to Arduino UNO (3.3V) and ESP32 (3V3)
• GND connected to ESP32 (GND)
• LCD_CS connected to ESP32 (D15)
• LCD_RS connected to ESP32 (D2)
• LCD_RST connected to ESP32 (D4)
• SD_SS connected to ESP32 (D5)
• SD_SCK connected to ESP32 (D18)
• SD_DO connected to ESP32 (D19)
• LCD_RD connected to ESP32 (D21)
• LCD_WR connected to ESP32 (D22)
• SD_DI connected to ESP32 (D23)

MW LRS-350-48

• L connected to 12V 200Ah Battery (GND)
• N connected to 12V 200Ah Battery (12V)
• -48V output connected to LM2596 Step Down Module (IN-)
• +48V output connected to LM2596 Step Down Module (IN+)

12V 200Ah Battery

• GND connected to MW LRS-350-48 (L)
• 12V connected to MW LRS-350-48 (N)

Arduino UNO

• GND connected to 5V 8-Channel Relay (GND) and ESP32 (GND)
• D2 connected to 5V 8-Channel Relay (IN1)
• D3 connected to 5V 8-Channel Relay (IN2)
• D4 connected to 5V 8-Channel Relay (IN3)
• D5 connected to 5V 8-Channel Relay (IN4)
• D6 connected to 5V 8-Channel Relay (IN5)
• 5V connected to 5V 8-Channel Relay (VCC)
• 3.3V connected to ESP32 (3V3) and 3.5" TFT LCD Shield (3.3V)
• D1 connected to ESP32 (RX0)