Circuit Documentation

Summary

This document provides a detailed overview of a circuit designed using various components including an ESP8266 NodeMCU, sensors, a relay, a water pump, and a display. The circuit is intended to monitor environmental conditions and control a water pump based on sensor inputs. The ESP8266 NodeMCU serves as the central microcontroller, interfacing with all other components.

Component List

1. ESP8266 NodeMCU

   • Description: A low-cost Wi-Fi microcontroller with GPIO, ADC, and other interfaces.
   • 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

2. DHT11 Humidity and Temperature Sensor

   • Description: A sensor for measuring temperature and humidity.
   • Pins: VDD, DATA, NULL, GND

3. HC-SR04 Ultrasonic Distance Sensor

   • Description: A sensor for measuring distance using ultrasonic waves.
   • Pins: VCC, TRIG, ECHO, GND

4. Water Pump

   • Description: A pump for moving water.
   • Pins: Positive, Negative

5. Piezo Buzzer

   • Description: A buzzer for generating sound.
   • Pins: Pin 1, Pin 2

6. USB Power

   • Description: A power source via USB.
   • Pins: +, -

7. 16x2 I2C LCD

   • Description: A 16x2 character LCD with I2C interface.
   • Pins: GND, VCC, SDA, SCL

8. 12V Battery

   • Description: A 12V power source.
   • Pins: +, -

9. 1-Channel Relay (5V 10A)

   • Description: A relay for switching high-power devices.
   • Pins: NC, Signal, C, Power, NO, Ground

10. SparkFun Soil Moisture Sensor

    • Description: A sensor for measuring soil moisture.
    • Pins: VCC, GND, SIG

11. GND

    • Description: Ground connection.
    • Pins: GND

12. Vcc

    • Description: Power supply connection.
    • Pins: Vcc

Wiring Details

ESP8266 NodeMCU

• D1: Connected to SCL pin of 16x2 I2C LCD
• D2: Connected to SDA pin of 16x2 I2C LCD
• D3: Connected to TRIG pin of HC-SR04 Ultrasonic Distance Sensor
• D4: Connected to ECHO pin of HC-SR04 Ultrasonic Distance Sensor
• D5: Connected to Pin 1 of Piezo Buzzer
• D7: Connected to DATA pin of DHT11 Humidity and Temperature Sensor
• D8: Connected to Signal pin of 1-Channel Relay
• A0: Connected to SIG pin of SparkFun Soil Moisture Sensor

DHT11 Humidity and Temperature Sensor

• VDD: Connected to Vcc
• DATA: Connected to D7 pin of ESP8266 NodeMCU
• GND: Connected to GND

HC-SR04 Ultrasonic Distance Sensor

• VCC: Connected to Vcc
• TRIG: Connected to D3 pin of ESP8266 NodeMCU
• ECHO: Connected to D4 pin of ESP8266 NodeMCU
• GND: Connected to GND

Water Pump

• Positive: Connected to NO pin of 1-Channel Relay
• Negative: Connected to Negative pin of 12V Battery

Piezo Buzzer

• Pin 1: Connected to D5 pin of ESP8266 NodeMCU
• Pin 2: Connected to GND

16x2 I2C LCD

• GND: Connected to GND
• VCC: Connected to Vcc
• SDA: Connected to D2 pin of ESP8266 NodeMCU
• SCL: Connected to D1 pin of ESP8266 NodeMCU

1-Channel Relay (5V 10A)

• Signal: Connected to D8 pin of ESP8266 NodeMCU
• C: Connected to Positive pin of 12V Battery
• Power: Connected to Vcc
• NO: Connected to Positive pin of Water Pump
• Ground: Connected to GND

SparkFun Soil Moisture Sensor

• VCC: Connected to Vcc
• GND: Connected to GND
• SIG: Connected to A0 pin of ESP8266 NodeMCU

GND

• GND: Connected to various components as specified above

Vcc

• Vcc: Connected to various components as specified above

Code

No code provided for this circuit.