Circuit Documentation

Summary

This circuit integrates various sensors and modules with an Arduino UNO microcontroller to perform a range of functions, including temperature sensing, humidity detection, gas level monitoring, real-time clock tracking, and data storage on a micro SD card. The circuit also features an LCD I2C display for output visualization. A resistor is used for pull-up configuration in the temperature sensor setup.

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.

LCD I2C Display

• An alphanumeric liquid crystal display with an I2C interface for displaying data.

DS1302 RTC (Real-Time Clock)

• A real-time clock module for timekeeping purposes.

Micro SD Card Module

• A module that allows the Arduino to read from and write to micro SD cards.

MQ-136 Gas Sensor

• A hydrogen sulfide gas sensor for detecting H2S levels in the air.

MQ6 Gas Sensor

• A gas sensor for detecting LPG, butane, propane, methane, alcohol, hydrogen, and smoke.

Humidity Sensor YL-69

• A soil moisture sensor that can also be used to detect soil humidity levels.

Temperature Sensor

• A digital temperature sensor for measuring ambient temperature.

Resistor

• A 200 Ohm resistor used for the temperature sensor's pull-up configuration.

Wiring Details

Arduino UNO

• 5V connected to the VCC pins of the Temperature Sensor, DS1302 RTC, LCD I2C Display, Humidity YL-69, MQ6, MQ-136, and Micro SD Card Module.
• GND connected to the GND pins of the Temperature Sensor, DS1302 RTC, LCD I2C Display, Humidity YL-69, MQ6, MQ-136, and Micro SD Card Module.
• D3 connected to the Resistor (pin1) and Temperature Sensor (Temp DQ Data Yellow).
• D4 connected to the Micro SD Card Module (cs).
• D6 connected to the DS1302 RTC (CLK).
• D7 connected to the DS1302 RTC (DATA).
• D8 connected to the DS1302 RTC (RST).
• D11 connected to the Micro SD Card Module (mosi).
• D12 connected to the Micro SD Card Module (miso).
• D13 connected to the Micro SD Card Module (sck).
• A0 connected to the MQ6 (A0).
• A1 connected to the MQ-136 (OUT1).
• A2 connected to the Humidity YL-69 (A0).
• SDA connected to the LCD I2C Display (SDA).
• SCL connected to the LCD I2C Display (SCL).
• D1 connected to the MQ6 (DO).
• D2 connected to the Humidity YL-69 (D0).

LCD I2C Display

• GND and VCC connected to the common GND and 5V rails, respectively.
• SDA and SCL connected to the corresponding SDA and SCL pins on the Arduino UNO.

DS1302 RTC

• VCC and GND connected to the common 5V and GND rails, respectively.
• CLK, DATA, and RST connected to digital pins D6, D7, and D8 on the Arduino UNO, respectively.

Micro SD Card Module

• vcc and gnd connected to the common 5V and GND rails, respectively.
• cs, sck, mosi, and miso connected to digital pins D4, D13, D11, and D12 on the Arduino UNO, respectively.

MQ-136 Gas Sensor

• VCC and GND connected to the common 5V and GND rails, respectively.
• OUT1 connected to analog pin A1 on the Arduino UNO.

MQ6 Gas Sensor

• VCC and GND connected to the common 5V and GND rails, respectively.
• A0 connected to analog pin A0 on the Arduino UNO.
• DO connected to digital pin D1 on the Arduino UNO.

Humidity Sensor YL-69

• VCC and GND connected to the common 5V and GND rails, respectively.
• A0 connected to analog pin A2 on the Arduino UNO.
• D0 connected to digital pin D2 on the Arduino UNO.

Temperature Sensor

• Temp VDD Red connected to the common 5V rail through a 200 Ohm Resistor.
• Temp GND Black connected to the common GND rail.
• Temp DQ Data Yellow connected to digital pin D3 on the Arduino UNO.

Resistor

• pin1 connected to digital pin D3 on the Arduino UNO.
• pin2 connected to the Temp VDD Red pin of the Temperature Sensor.

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 include specific functionality. It needs to be populated with the logic to initialize and read from the connected sensors and modules, and to display data on the LCD I2C Display.