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1. How to make homemade household gas flow monitoring equipment? The overall threshold for homemade household gas flow monitoring equipment is relatively low, suitable for novice electronic enthusiasts. The core process is divided into four core steps: material preparation, hardware connection, code writing, and calibration testing Preparation of required materials • Gas flow sensor: Priority should be given to thermal gas mass flow sensors (such as the commonly used FS1015 model), which are suitable for common household gases such as air and natural gas. Models with corresponding ranges can be selected according to the small flow requirements of household scenarios. • Microcontroller: Choose the entry-level Arduino Uno development board, which is easy to operate and has a large number of publicly available tutorials for reference. Display screen: The 1602 LCD display screen can meet household display needs, with low cost and easy wiring. Power supply accessories: 5V power adapter or power bank, providing power for the entire device. • Auxiliary accessories: breadboard, DuPont wires, used for quickly building temporary circuits
2. Hardware connection - Connect the VCC pin of the gas flow sensor to the 5V pin of the Arduino, the GND pin to the GND pin of the Arduino, and the signal output pin to the analog input pin of the Arduino (such as A0). -According to the 4-digit wiring standard of 1602 LCD, connect the RS pin to the 12th digital pin of Arduino, the EN pin to the 11th digital pin, and connect the D4-D7 to the 5th, 4th, 3rd, and 2nd digital pins respectively. At the same time, connect 5V power supply and GND to the LCD, and an additional potentiometer can be installed to adjust the screen contrast. -Check the positive and negative terminals of all wiring to avoid short circuits. After confirming that there are no errors, connect the main power supply. Write and upload code - Open the Arduino IDE, copy the following basic code framework, and be sure to replace the flow conversion coefficient according to the sensor model you have selected. Example values are for reference only: cpp # include//Initialize the LCD pin, and adjust the Liquid Crystal LCD (12, 11, 5, 4, 3, 2) according to the actual wiring; //Define the sensor signal pin and keep it consistent with the hardware connection pin const int sensorPin=A0; Void setup () {//Initialize LCD screen lcd. begin (16, 2); //Enable serial communication for easy debugging of Serial. start (9600); }Void loop() {//Read sensor analog value int sensorValue=analogiRead() (sensorPin); //Please replace the conversion coefficient below according to the sensor manual. The example is only for reference float flowRate=sensorValue * 0.1; //Display flow data lcd.setcursor (0,0) on the first row of the LCD screen; lcd.print("Flow Rate: "); lcd.print(flowRate); lcd.print(" L/min"); //Can be adjusted according to actual units//Serial port synchronized output data is used for debugging Serial. print ("Current Flow:"); Serial.print(flowRate); Serial.println(" L/min"); delay(1000); //Update data once per second - Connect the Arduino to the computer via USB, select the correct development board and port in the IDE, and upload code to the development board
4. Testing and Calibration - Power on the device, observe whether the LCD screen displays the words "Flow Rate: XXXX" normally, and confirm that there are no issues with the wiring and code. -Use a known flow rate gas source for