Circuit Documentation

Summary

This circuit is designed to control a water pump based on soil moisture levels using an ESP32 microcontroller. The system includes a soil moisture sensor, a relay module, and a water pump. The ESP32 reads the soil moisture levels and activates the relay to power the water pump when necessary.

Component List

1. ESP32 (30 pin)

   • Description: A versatile microcontroller with Wi-Fi 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

2. 1 Channel 5V Relay Module

   • Description: A relay module used to control high voltage devices with a low voltage signal.
   • Pins: VCC+, VCC- (GND), IN, N.O., COM, N.C.

3. Water Pump

   • Description: A pump used to move water.
   • Pins: VCC, GND

4. 9V Battery

   • Description: A power source for the water pump.
   • Pins: +, -

5. LM393

   • Description: A comparator used to read the soil moisture sensor.
   • Pins: A0, D0, GND, VCC

6. Soil Moisture Sensor

   • Description: A sensor used to measure the moisture level in the soil.
   • Pins: positive, negative

7. Resistor

   • Description: A 200 Ohms resistor used in the circuit.
   • Pins: pin1, pin2
   • Properties: Resistance = 200 Ohms

Wiring Details

ESP32 (30 pin)

• D18 is connected to IN of the 1 Channel 5V Relay Module.
• D2 is connected to A0 of the LM393.
• GND is connected to pin2 of the Resistor, VCC- (GND) of the 1 Channel 5V Relay Module, and GND of the LM393.
• 3V3 is connected to pin1 of the Resistor, VCC+ of the 1 Channel 5V Relay Module, and VCC of the LM393.

1 Channel 5V Relay Module

• IN is connected to D18 of the ESP32.
• VCC- (GND) is connected to GND of the ESP32, pin2 of the Resistor, and GND of the LM393.
• VCC+ is connected to 3V3 of the ESP32, pin1 of the Resistor, and VCC of the LM393.
• N.O. is connected to VCC of the Water Pump.
• COM is connected to + of the 9V Battery.

Water Pump

• VCC is connected to N.O. of the 1 Channel 5V Relay Module.
• GND is connected to - of the 9V Battery.

9V Battery

• + is connected to COM of the 1 Channel 5V Relay Module.
• - is connected to GND of the Water Pump.

LM393

• A0 is connected to D2 of the ESP32.
• GND is connected to GND of the ESP32, pin2 of the Resistor, and VCC- (GND) of the 1 Channel 5V Relay Module.
• VCC is connected to 3V3 of the ESP32, pin1 of the Resistor, and VCC+ of the 1 Channel 5V Relay Module.

Soil Moisture Sensor

• negative is connected to GND of the LM393.
• positive is connected to VCC of the LM393.

Resistor

• pin1 is connected to 3V3 of the ESP32, VCC+ of the 1 Channel 5V Relay Module, and VCC of the LM393.
• pin2 is connected to GND of the ESP32, VCC- (GND) of the 1 Channel 5V Relay Module, and GND of the LM393.

Documented Code

sketch.ino

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
}

void loop() {
  // put your main code here, to run repeatedly:
  Serial.print("ceva");
}

documentation.txt