Circuit Documentation

Summary of the Circuit

The circuit in question consists of an ESP8266 NodeMCU microcontroller unit (MCU) interfaced with an MQ-4 Methane Gas Sensor. The ESP8266 NodeMCU is a popular WiFi-enabled microcontroller that is widely used for IoT projects. The MQ-4 sensor is designed to detect methane gas concentrations in the air. The circuit is designed to power the MQ-4 sensor from the 3.3V output of the ESP8266 and to read the analog output of the sensor using one of the analog pins on the MCU.

Component List

ESP8266 NodeMCU

• Description: A WiFi-enabled microcontroller unit that is commonly used for IoT projects.
• Pins: D0, D1, D2, D3, D4, 3V3, GND, D5, D6, D7, D8, RX, TX, A0, RSV, SD3, SD2, SD1, CMD, SD0, CLK, EN, RST, VIN

MQ-4 SENSOR METHANE

• Description: A gas sensor designed for the detection of methane (CH4) concentrations in the air.
• Pins: VCC, GND, A0, D0

Wiring Details

ESP8266 NodeMCU

• 3V3: Connected to the VCC pin of the MQ-4 Methane Gas Sensor to provide power.
• GND: Connected to the GND pin of the MQ-4 Methane Gas Sensor to complete the power circuit.
• A0: Connected to the A0 pin of the MQ-4 Methane Gas Sensor to read the analog gas concentration value.

MQ-4 SENSOR METHANE

• VCC: Powered by the 3V3 pin of the ESP8266 NodeMCU.
• GND: Connected to the GND pin of the ESP8266 NodeMCU.
• A0: Outputs an analog signal to the A0 pin of the ESP8266 NodeMCU representing the methane gas concentration.

Documented Code

No code has been provided for the microcontroller. To fully utilize the circuit, embedded code should be written and uploaded to the ESP8266 NodeMCU to initialize the WiFi module, read the analog value from the MQ-4 sensor, and process the data accordingly (e.g., sending it to a server or displaying it on a user interface).

Typically, the code would include the following steps:

1. Initialize serial communication for debugging purposes.
2. Set up the analog pin as an input.
3. In the main loop, read the analog value from the MQ-4 sensor.
4. Convert the analog value to a corresponding methane concentration if calibration data is available.
5. Transmit the methane concentration data to a remote server or display it on a connected display.

Since no code is provided, this section will be left blank. Users of this documentation should provide their own code based on the specific requirements of their project.