๐ ๏ธ MAKER GUIDEMay 28, 2026โขโฑ๏ธ 2 min readโข๐ณ๐ต Tested in Nepal
Industrial Liquid Flow & Volume Metering System with YF-S201 & RS485
Monitor pipe water flow rates (L/min) and total cumulative volume over long distances using YF-S201 Hall Flow Sensors, MAX485, and LCD display.
๐ ๏ธ BILL OF MATERIALS (BOM)
Required Hardware & Component Checklist
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Estimated Total (5/5 items):
NPRย 2,600
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NPRย 550
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Industrial Liquid Flow & Volume Metering System with YF-S201 & RS485
Track water flow rates and volume using the YF-S201 Hall Effect Turbine Flowmeter (1-30 L/min) and transmit real-time telemetry over MAX485 RS485 to a central 1602 LCD monitor.
Hardware Bill of Materials:
- Microcontroller: ESP32 (38 Pin) WiFi + Bluetooth NodeMCU-32 Development Board
- Flow Sensor: YF-S201 1/2 Inch Water Flow Sensor Hall Flowmeter 1-30L/min
- Serial Bus: MAX485 TTL To RS485 Module
- Display: 1602 (16x2) LCD Display with I2C/IIC interface - Blue Backlight
- Power Supply: 12v 1 Amp Power Adapter
Circuit Pinout & Wiring Connections:
| Component / Sensor Pin | ESP32 GPIO Pin | Function / Description |
|---|---|---|
| YF-S201 VCC / GND | 5V / GND | Hall Flowmeter Turbine Power |
| YF-S201 Pulse Out (Yellow) | GPIO 4 (Interrupt) | 450 Pulses per Liter Turbine Signal |
| MAX485 DI / RO | GPIO 17 (TX2) / GPIO 16 (RX2) | Hardware Serial2 RS485 Bus |
| MAX485 DE & RE | GPIO 5 | Direction Pin (HIGH=TX, LOW=RX) |
| 1602 LCD SDA / SCL | GPIO 21 / GPIO 22 | I2C Flow Rate (L/min) Screen |
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