KeyeStudio KS0110 EASY Plug Hall Magnetic Sensor Module

The KeyeStudio KS0110 EASY Plug Hall Magnetic Sensor detects a nearby magnetic field and outputs a digital on/off signal. It is useful for non-contact switches, door or lid detection, rotary pulse counting, waterproof-style triggers, and position sensing.

Because sensing is contactless, the module avoids mechanical wear and works well where a normal button or limit switch would be exposed to dust or movement. The EASY Plug RJ11 connector reduces wiring mistakes in classroom and robotics projects.

Use a permanent magnet as the trigger target and test the final magnet distance before mounting. The detection range depends on magnet strength, orientation, and nearby metal parts.

Technical Specifications

Board Layout & Label Guide

• Hall sensing area: Place the magnet path near this region.
• RJ11 connector: Connects to EASY Plug digital port.
• Digital output: Changes state when the magnetic field is detected.
• VCC/GND: Module power and ground reference.
• Magnet alignment: Keep distance and polarity consistent for repeatable triggering.
• Mounting note: Secure both the sensor and magnet to avoid false position changes.
• Interrupt option: Use interrupt-capable pins for wheel or RPM counting.

Application Scenarios

1. Door or Lid Sensor

Detect a magnet on a door, lid, or sliding part and report the open/closed state.

const int HALL_PIN = 2;void setup() { pinMode(HALL_PIN, INPUT_PULLUP); Serial.begin(115200);}void loop() { bool magnetNear = digitalRead(HALL_PIN) == LOW; Serial.println(magnetNear ? “closed” : “open”); delay(200);}

2. RPM Pulse Counter

Attach a small magnet to a wheel and count pulses with an interrupt.

const int HALL_PIN = 2;volatile unsigned long pulses = 0;void onPulse() { pulses++;}void setup() { pinMode(HALL_PIN, INPUT_PULLUP); attachInterrupt(digitalPinToInterrupt(HALL_PIN), onPulse, FALLING); Serial.begin(115200);}void loop() { noInterrupts(); unsigned long count = pulses; pulses = 0; interrupts(); Serial.print(“pulses_per_second=”); Serial.println(count); delay(1000);}

3. Non-Contact Limit Switch

Stop a small actuator or motor when the magnetic limit point is reached.

const int HALL_PIN = 2;const int MOTOR_PIN = 9;void setup() { pinMode(HALL_PIN, INPUT_PULLUP); pinMode(MOTOR_PIN, OUTPUT);}void loop() { bool atLimit = digitalRead(HALL_PIN) == LOW; analogWrite(MOTOR_PIN, atLimit ? 0 : 180);}

Packing List

• 1 x KeyeStudio EASY Plug Hall Magnetic Sensor

FAQ

Q: Does it detect all metals?
A: No. It detects magnetic fields, so use a magnet or magnetic material.

Q: Is the output analog?
A: No. This module provides a digital on/off signal.

Q: How far can it detect?
A: Distance depends on magnet strength, polarity, and alignment.

Q: Can it count wheel speed?
A: Yes. Use a magnet on the rotating part and count pulses with an interrupt.

Q: Can it replace a limit switch?
A: Often yes, if the magnet and sensor alignment is repeatable.

Q: Why does it not trigger?
A: Try reversing magnet polarity, reducing the gap, or checking the digital input mode.

Q: Can it be used outdoors?
A: Protect the electronics from moisture and vibration.

Q: Is it safe for microcontroller GPIO?
A: Yes when powered and wired according to the control board’s logic voltage.