Circuit Documentation

Summary of the Circuit

This circuit is designed to interface with various sensors and a relay to perform data logging and control functions. It includes temperature and humidity sensing (DHT11), light intensity measurement (Photocell), soil moisture detection (Soil Moisture Sensor and Capacitive Soil Moisture Sensor V1.2), and a relay module for controlling a solenoid valve. The Adafruit Datalogger Shield v1 serves as the central interface for the sensors and provides data logging capabilities. The circuit is powered by a 12V power supply, and a resistor is used for the photocell voltage divider.

Component List

Adafruit Datalogger Shield v1

• SD card interface for data logging
• Real-time clock for timestamping data
• Digital and analog I/O pins for interfacing with sensors and actuators

DHT11 (x2)

• Measures temperature and humidity
• Simple digital interface

Photocell (LDR)

• Measures light intensity
• Requires an external resistor to form a voltage divider

12V Single Channel Relay

• Controls high power devices like solenoid valves
• Has Normally Open (NO) and Normally Closed (NC) contacts

Resistor

• 10k Ohm resistor used for the photocell voltage divider

Plastic Solenoid Valve

• Controlled by the relay to allow/block fluid flow

12V Power Supply

• Provides power to the circuit

Soil Moisture Sensor

• Detects the moisture level in the soil

Capacitive Soil Moisture Sensor V1.2

• Detects soil moisture levels using capacitive sensing

Soil Moisture Module

• Interfaces with the soil moisture sensor

Wiring Details

Adafruit Datalogger Shield v1

• +5V connected to VCC of DHT11 sensors, Photocell, Capacitive Soil Moisture Sensor V1.2, and 12V Single Channel Relay
• GND connected to GND of DHT11 sensors, Capacitive Soil Moisture Sensor V1.2, 10k Ohm Resistor, and 12V Single Channel Relay
• D2 connected to DATA of DHT11 sensors
• A0 connected to one end of the Photocell, other end connected to 10k Ohm Resistor
• A1 connected to AOUT of Capacitive Soil Moisture Sensor V1.2
• D3 connected to IN of 12V Single Channel Relay

DHT11

• VCC connected to +5V
• DATA connected to D2 of Adafruit Datalogger Shield v1
• GND connected to GND

Photocell (LDR)

• One end connected to +5V
• Other end connected to A0 of Adafruit Datalogger Shield v1 and to 10k Ohm Resistor

12V Single Channel Relay

• VCC connected to +5V
• GND connected to GND
• IN connected to D3 of Adafruit Datalogger Shield v1
• COM connected to + of 12V Power Supply
• NO connected to one pin of the Plastic Solenoid Valve

Resistor (10k Ohm)

• One end connected to GND
• Other end connected to A0 of Adafruit Datalogger Shield v1 and to one end of the Photocell

Plastic Solenoid Valve

• One pin connected to NO of 12V Single Channel Relay
• Other pin connected to - of 12V Power Supply

12V Power Supply

• + connected to COM of 12V Single Channel Relay
• - connected to one pin of the Plastic Solenoid Valve

Soil Moisture Sensor

• Not directly connected in the provided net list

Capacitive Soil Moisture Sensor V1.2

• VCC connected to +5V
• GND connected to GND
• AOUT connected to A1 of Adafruit Datalogger Shield v1

Soil Moisture Module

• Not directly connected in the provided net list

Documented Code

sketch.ino

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

}

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

}

documentation.txt

No additional code documentation provided.