This document provides a detailed overview of a circuit that includes an Arduino UNO as the central microcontroller, interfaced with various peripherals including an MQ-2 gas sensor, a Real-Time Clock (RTC) DS3231, an SD card reader, a SIM 800L GSM module, and a 12V 7Ah battery with a 5V step-down voltage regulator. The circuit is designed to leverage the Arduino's capabilities to interact with these components, possibly for data logging, timekeeping, communication, and gas detection applications.
5V
and GND
are used to power the MQ-2 sensor, SD card reader, and RTC DS3231.Vin
is connected to the 5V output of the step-down voltage regulator.GND
is also connected to the GND of the step-down voltage regulator and the SIM 800L GSM module.D11
, D13
, D4
, D3
, and D2
are used for interfacing with the SD card reader and the SIM 800L GSM module.A0
is connected to the MQ-2 sensor.A4
(SDA) and A5
(SCL) are connected to the RTC DS3231.VCC
is connected to the 5V supply from the Arduino.GND
is connected to the common ground.A0
is connected to the analog input A0
on the Arduino.VCC
is connected to the 5V supply from the Arduino.GND
is connected to the common ground.SDA
and SCL
are connected to A4
and A5
on the Arduino, respectively.5V
and GND
are connected to the 5V supply and common ground, respectively.MOSI
, SCK
, CS
, and MISO
are connected to digital pins D11
, D13
, D4
, and D12
on the Arduino, respectively.5V/4V
is connected to the 5V output of the step-down voltage regulator.GND
is connected to the common ground.SIM_TXD
and SIM.RXD
are connected to digital pins D3
and D2
on the Arduino, respectively.12v +
is connected to the VIN
of the step-down voltage regulator.12v -
is connected to the GND
of the step-down voltage regulator.VIN
is connected to the 12v +
of the battery.GND
is connected to the 12v -
of the battery and the common ground.VOUT
provides 5V which is used to power the Arduino Vin
and the SIM 800L GSM module.void setup() {
// put your setup code here, to run once:
}
void loop() {
// put your main code here, to run repeatedly:
}
This code is a template and does not contain any specific functionality. It provides the basic structure for an Arduino sketch with setup()
and loop()
functions where the user can add initialization code and the main code to be executed repeatedly, respectively.