Circuit Documentation

Summary of the Circuit

This circuit appears to be designed to control a 12V pneumatic solenoid valve using an ESP32-based Wemos microcontroller and an IRFZ44N power MOSFET as a switch. The microcontroller's GPIO pin is used to drive the gate of the MOSFET through a resistor, which in turn controls the power to the solenoid valve. A separate power supply provides the necessary 12V to the solenoid valve and the MOSFET's source pin. The circuit also includes a pull-down resistor on the gate of the MOSFET to ensure it remains off when not explicitly driven by the microcontroller.

Component List

ESP32 Wemos

• Description: A microcontroller board based on the ESP32 chip, featuring Wi-Fi and Bluetooth connectivity.
• Pins: SD3, TCK, 3V3, IO5, IO23, IO19, IO18, IO26, SVP, RST, CDM, SD2, NC, TMS, IO34, IO33, IO35, SVN, GND, SD0, TD0, VCC, IO16, IO17, IO21, IO22, RXD, IO27, IO25, IO32, TDI, IO4, IO0, IO2, SD1, CLK, TXD

IRFZ44N

• Description: A power MOSFET used for switching heavy loads.
• Pins: Gate, Drain, Source

12V Power Supply

• Description: Provides a 12V output to power the solenoid valve and the MOSFET.
• Pins: + (VCC), - (GND)

12V Pneumatic Solenoid Valve

• Description: An electrically-controlled valve used for controlling air flow.
• Pins: VCC, GND

Resistor (220 Ohms)

• Description: A resistor with a resistance of 220 Ohms, likely used for current limiting.
• Pins: pin1, pin2

Resistor (10k Ohms)

• Description: A resistor with a resistance of 10k Ohms, likely used as a pull-down for the MOSFET gate.
• Pins: pin1, pin2

Wiring Details

ESP32 Wemos

• IO2 is connected to a 220 Ohm resistor.

IRFZ44N

• Gate is connected to a 10k Ohm resistor and a 220 Ohm resistor.
• Drain is connected to the 12V Pneumatic solenoid valve and a 10k Ohm resistor.
• Source is connected to the negative terminal of the 12V power supply.

12V Power Supply

• • (VCC) is connected to the 12V Pneumatic solenoid valve.
• • (GND) is connected to the Source pin of the IRFZ44N.

12V Pneumatic Solenoid Valve

• VCC is connected to the + (VCC) terminal of the 12V power supply.
• GND is connected to the Drain pin of the IRFZ44N.

Resistor (220 Ohms)

• One pin is connected to the IO2 pin of the ESP32 Wemos.
• The other pin is connected to the Gate pin of the IRFZ44N.

Resistor (10k Ohms)

• One pin is connected to the Gate pin of the IRFZ44N.
• The other pin is connected to the Drain pin of the IRFZ44N and the GND pin of the 12V Pneumatic solenoid valve.

Documented Code

There is no code provided for the microcontroller. Typically, the code would be responsible for setting the GPIO pin connected to the MOSFET gate to a high or low state, thus controlling the solenoid valve. Without the code, the operation of the microcontroller within the circuit cannot be documented.