This article covers Headerbs 雨滴センサー葉水分センサーリレーモジュール12V FR.
Overview
The Headerbs Raindrop Sensor Leaf Moisture Sensor Relay Module 12V FR-04 is a compact sensor module that detects raindrops or leaf moisture and controls external devices via a relay output. The sensing area uses FR-04 material with a 5.0×4.0cm nickel-plated surface for oxidation resistance and conductivity. Operating on 12V DC, it features an adjustable sensitivity potentiometer to set the moisture threshold. This module is suitable for weather monitoring, automated irrigation, and DIY electronics projects. Sold on under the barebone PC category, this product is actually a general-purpose sensor module for hobbyists and makers. It includes a high-power relay rated at 250V 10A AC / 30V 10A DC, allowing direct control of motors, pumps, or other loads. Status LEDs indicate power and relay state for easy monitoring.
Key Features
12V DC operation with 5–12mA quiescent current: Low power consumption enables continuous monitoring, even on battery power. Relay load capacity 250V 10A AC / 30V 10A DC: Can switch moderate loads directly without an external contactor. 5.0×4.0cm FR-04 sensing board: Large detection area ensures reliable moisture capture; nickel plating extends lifespan. Adjustable sensitivity via potentiometer: Set the exact moisture level that triggers the relay, offering precise control. * Power and relay status LEDs: Visual indicators simplify troubleshooting and system status checks.
Compatibility Guide
This module requires a 12V DC power supply capable of at least 2A (the USB 2.0 connector can be used for power, but ensure adequate current). The sensor board connects to the relay module via included cables; terminal blocks or pin headers allow easy wiring. It is not designed for direct PC integration but can interface with microcontrollers like Arduino or Raspberry Pi via digital output. Mounting holes are provided for enclosure or breadboard installation. For outdoor use, protect the board from direct water exposure.
Product Info
The Headerbs Raindrop Sensor Leaf Moisture Sensor Relay Module 12V FR-04 is available on . Pricing typically ranges from ¥1,000 to ¥2,000. The package includes the sensor board, relay module, and connecting wires. Warranty is limited to initial defects as per the seller's policy. Dimensions: sensor board approx. 5.0×4.0cm; relay module approx. 6×4×2cm.
Best Use Cases
DIY automated irrigation systems: Detect rain to pause watering, or sense soil moisture to control a pump. The adjustable threshold prevents overwatering. Weather monitoring and environmental logging: Use as a rain detector or leaf wetness sensor; the relay can trigger alarms or data loggers. * Electronics learning and IoT projects: Practical example of relay control with a microcontroller; ideal for building smart home automation prototypes.
Things to Consider
This product is not a PC component despite being listed under barebone PC; it is an electronic sensor module. It requires a 12V power source – standard USB 5V will not activate the relay. Ensure the load does not exceed the relay's rated capacity. Sensitivity adjustment needs a small screwdriver. The module is not waterproof; outdoor installations require a weatherproof enclosure. For advanced users, the analog output from the sensor can be read by a microcontroller for more flexible control.