Circuit Documentation

Summary

This document provides a detailed overview of a circuit designed to monitor environmental conditions using various sensors and an Arduino Nano microcontroller. The circuit includes a WiFi module for connectivity, multiple sensors for soil moisture, temperature, humidity, and nutrient levels, and a power supply from 18650 Li-ion batteries.

Component List

1. Arduino Nano

   • Description: A small, complete, and breadboard-friendly board based on the ATmega328P.
   • Pins: D1/TX, D0/RX, RESET, GND, D2, D3, D4, D5, D6, D7, D8, D9, D10, D11/MOSI, D12/MISO, VIN, 5V, A7, A6, A5, A4, A3, A2, A1, A0, AREF, 3V3, D13/SCK

2. 18650 Li-ion Battery x 2

   • Description: Rechargeable lithium-ion batteries used to power the circuit.
   • Pins: +, -

3. SparkFun Soil Moisture Sensor

   • Description: Measures the volumetric content of water in soil.
   • Pins: VCC, GND, SIG

4. NPK Soil Sensor

   • Description: Measures the nitrogen (N), phosphorus (P), and potassium (K) levels in the soil.
   • Pins: 12V DC, A, B, GND

5. DHT22

   • Description: Measures temperature and humidity.
   • Pins: VCC, OUT, GND

6. Adafruit MS8607 PHT Sensor

   • Description: Measures pressure, humidity, and temperature.
   • Pins: VCC, 3.3V, GND, SCL, SDA

7. TDS Sensor

   • Description: Measures the total dissolved solids in water.
   • Pins: AI, GND, 5V

8. WiFi module ESP8266-01

   • Description: Provides WiFi connectivity.
   • Pins: RX, GPIO0, GPIO2, GND, +3V3, Reset, CH-PD Chip power down, TX

Wiring Details

Arduino Nano

• D1/TX connected to RX of WiFi module ESP8266-01
• D0/RX connected to TX of WiFi module ESP8266-01
• D3 connected to OUT of DHT22
• VIN connected to + of 18650 Li-ion Battery x 2
• GND connected to:
  • GND of WiFi module ESP8266-01
  • GND of DHT22
  • GND of TDS Sensor
  • GND of NPK Soil Sensor
  • GND of SparkFun Soil Moisture Sensor
  • - of 18650 Li-ion Battery x 2
  • GND of Adafruit MS8607 PHT Sensor
• 5V connected to:
  • +3V3 of WiFi module ESP8266-01
  • VCC of DHT22
  • 5V of TDS Sensor
  • 12V DC of NPK Soil Sensor
  • VCC of SparkFun Soil Moisture Sensor
  • VCC of Adafruit MS8607 PHT Sensor
• A2 connected to SDA of Adafruit MS8607 PHT Sensor
• A1 connected to A of NPK Soil Sensor
• A0 connected to SIG of SparkFun Soil Moisture Sensor

18650 Li-ion Battery x 2

• + connected to VIN of Arduino Nano
• - connected to GND of Arduino Nano

SparkFun Soil Moisture Sensor

• VCC connected to 5V of Arduino Nano
• GND connected to GND of Arduino Nano
• SIG connected to A0 of Arduino Nano

NPK Soil Sensor

• 12V DC connected to 5V of Arduino Nano
• A connected to A1 of Arduino Nano
• GND connected to GND of Arduino Nano

DHT22

• VCC connected to 5V of Arduino Nano
• OUT connected to D3 of Arduino Nano
• GND connected to GND of Arduino Nano

Adafruit MS8607 PHT Sensor

• VCC connected to 5V of Arduino Nano
• GND connected to GND of Arduino Nano
• SDA connected to A2 of Arduino Nano

TDS Sensor

• 5V connected to 5V of Arduino Nano
• GND connected to GND of Arduino Nano

WiFi module ESP8266-01

• RX connected to D1/TX of Arduino Nano
• TX connected to D0/RX of Arduino Nano
• GND connected to GND of Arduino Nano
• +3V3 connected to 5V of Arduino Nano

Documented Code

Arduino Nano Code (sketch.ino)

void setup() {
  // put your setup code here, to run once:

}

void loop() {
  // put your main code here, to run repeatedly:

}

Additional Documentation (documentation.txt)

This document provides a comprehensive overview of the circuit, including the components used, their connections, and the code running on the Arduino Nano.