Premium Quality 3144 Hall Effect Magnetic Sensor Plate Module 3.3V-5V Contactless RPM Speed Proximity Detector 1Pc

• Operating Voltage: 3.3V to 5V DC
• Main Sensor IC: A3144EUA Unipolar Hall Effect Switch
• Comparator IC: Onboard LM393 Wide-Range Voltage Comparator
• Output Current Capability: 25 mA (Sinks current to pull logic low)
• Magnetic Turn-on Threshold (BOP): 35 to 450 Gauss
• Minimum Built-in Hysteresis: 20 Gauss
• Output Signals: 1 x Digital (Active Low), 1 x Analog
• Working Temperature Range: -40°C to 85°C
• Module Board Weight: 3 grams
• Board Dimensions: 31 mm × 15 mm × 14 mm

Features

• Contactless Detection: Operates purely via magnetic fields, mitigating mechanical wear and extending operational life.
• Dual Output Architecture: Features both a digital output (DOUT) for quick logic processing and an analog output (AOUT) for raw flux variance calculation.
• Visual Status Indicator: Equipped with an onboard LED that automatically illuminates when a magnetic threshold is crossed.
• High Stability Schmitt Trigger: Uses integrated hysteresis to prevent false triggers or signal chattering caused by structural vibrations.
• Reverse Battery Protection: Protects internal circuitry from damage if power inputs are accidentally cross-wired.

Applications

• Motor RPM Speed Measurement: Paired with a rotating magnetic wheel to serve as a high-speed digital tachometer.
• Smart Vehicle Navigation: Integrated into smart car chassis kits to measure structural distance or track black/white tracks using magnetic markers.
• Security Alarms: Configured as a contactless window or door open/close magnetic switch sensor.
• Robotic Arm Positioning: Utilized to define precise structural limit boundaries or proximity endpoints for movement articulation.
• Contactless Limit Switches: Replaces mechanical momentary buttons inside harsh or dust-heavy industrial systems.

Usage

• Pin Allocation Connection: Pin out layout includes VCC (Connect to 3.3V/5V MCU rail), GND (Connect to system ground), DOUT (Connect to digital input pin of Arduino/ESP32), and AOUT (Connect to ADC pin if reading analog flux).
• Pull-Up Configuration: If utilizing the raw sensor pin without the breakout plate, install a mandatory 10kΩ pull-up resistor between the output signal pin and the VCC pin to maintain a stable logic High state during the absence of a magnetic field.
• Magnetic Polar Orientation Alignment: Position the targeted magnet so that its South Pole directly faces the front printed face of the 3144 sensor element, as unipolar sensors are pole-specific.
• Threshold Verification: Use the built-in plate LED to manually test your magnet distance tolerances before writing downstream automation scripts.