Circuit Documentation

Summary of the Circuit

This circuit is designed to interface various sensors and modules with an Arduino UNO microcontroller. The components include a SIM900A GSM module, a turbidity sensor, a pH meter, a DS18B20 temperature sensor, an LCD screen with I2C interface, and a resistor. The circuit is powered by a 9V battery connected through a power jack. The Arduino UNO serves as the central processing unit, reading sensor data and controlling the LCD display. The SIM900A module allows for GSM communication capabilities.

Component List

Arduino UNO

• Microcontroller board based on the ATmega328P
• It has 14 digital input/output pins, 6 analog inputs, a 16 MHz quartz crystal, a USB connection, a power jack, an ICSP header, and a reset button.

SIM900A

• GSM/GPRS module for communication over the cellular network
• It features a set of GPIOs, including RXD, TXD for UART communication, and status and control pins.

Resistor

• A passive two-terminal electrical component that implements electrical resistance as a circuit element.
• Resistance: 4700 Ohms

Turbidity Module

• Sensor module used to measure the turbidity (cloudiness) of a liquid, indicating the degree to which the water loses its transparency due to the presence of suspended particulates.

PH Meter

• Sensor used to measure the hydrogen-ion activity in water-based solutions, indicating its acidity or alkalinity expressed as pH.

DS18B20 1-Wire Temperature Sensor Probe Cable

• Digital temperature sensor that uses a one-wire interface for communication.
• It provides 9-bit to 12-bit Celsius temperature measurements.

LCD screen 16x2 I2C

• Alphanumeric liquid crystal display capable of displaying 16 characters per line in 2 lines.
• Uses I2C communication protocol.

9V Battery

• Standard 9V battery used to power the circuit.

Power Jack

• A connector for the 9V battery to supply power to the circuit.

Wiring Details

Arduino UNO

• 5V and GND are used to power the circuit.
• Analog pins A0 and A1 are connected to the signal outputs of the pH meter and turbidity module, respectively.
• I2C pins A4 (SDA) and A5 (SCL) are connected to the corresponding pins on the LCD screen.
• Digital pin D2 is connected to the DS18B20 temperature sensor.
• Digital pins D10 and D11 are used for controlling the SIM900A module.

SIM900A

• VCC is connected to the 5V output from the Arduino.
• GND is connected to the ground of the circuit.
• 5VR and 5VT are connected to digital pins D11 and D10 on the Arduino for communication.

Resistor

• One end is connected to the D2 pin on the Arduino and the other end to the VDD pin of the DS18B20 temperature sensor.

Turbidity Module

• VCC is connected to the 5V output from the Arduino.
• GND is connected to the ground of the circuit.
• AO is connected to the A1 analog input on the Arduino.

PH Meter

• VCC is connected to the 5V output from the Arduino.
• GND is connected to the ground of the circuit.
• Signal is connected to the A0 analog input on the Arduino.

DS18B20 1-Wire Temperature Sensor Probe Cable

• VDD is connected to the 5V output from the Arduino through a 4700 Ohm resistor.
• GND is connected to the ground of the circuit.
• DQ is connected to the D2 digital input/output on the Arduino.

LCD screen 16x2 I2C

• VCC is connected to the 5V output from the Arduino.
• GND is connected to the ground of the circuit.
• SDA is connected to the A4 analog input on the Arduino.
• SCL is connected to the A5 analog input on the Arduino.

9V Battery and Power Jack

• The + terminal of the battery is connected to the POSITIF pin of the power jack.
• The - terminal of the battery is connected to the NEGATIF pin of the power jack.

Documented Code

Arduino UNO Code (sketch.ino)

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

}

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

}

Note: The provided code is a template and does not contain any functional code. It needs to be populated with the logic for reading sensors, controlling the LCD, and handling communication with the SIM900A module.