KY-003 Hall Effect Sensor | 10 Pack Module | For Arduino & Smart Car Projects

This KY-003 Hall effect sensor module detects a magnetic field. When a magnet comes near, the sensor outputs a digital signal. It acts as a non-contact switch. This 10-pack is good for stocking up for your Arduino projects, smart cars, and other electronics builds. Features and Benefits - A3144 sensor chip - It gives a digital HIGH/LOW output. This is simple to read with any microcontroller. - Onboard indicator light - The LED lights up when a magnetic field is detected. This helps with troubleshooting and setup. - Simple 3-pin connection - It connects directly to an Arduino or Raspberry Pi. It uses VCC, GND, and a single digital I/O pin. - Solid-state design - It has no moving parts. This makes it more dependable and longer-lasting than a mechanical reed switch. Applications - Building a simple alarm that triggers when a door or window opens. - Creating a non-contact tachometer to measure the speed of a spinning wheel or motor. - Detecting the position of parts in a 3D printer or custom robotic system. 🛠️ Tools Required To test the KY-003 Hall Effect Sensor modules, you will need a few basic tools. A multimeter capable of measuring voltage and continuity is essential for checking power and signal outputs. A breadboard can be very helpful for temporarily assembling the circuit without soldering, especially when working with the 10 pieces included in the pack. Jumper wires are also necessary to connect the sensor to your power source and multimeter. A 5V power supply, such as an Arduino board or a dedicated bench power supply, is required to power the sensor. 📌 Pinout Identification The KY-003 Hall Effect Sensor module typically features three pins. These are usually labelled or can be identified by their position. One pin is for VCC (power input, usually 5V), another for GND (ground), and the third for OUT (signal output). Refer to the module's silk screen printing for precise identification. Incorrectly connecting power and ground can damage the sensor. Always double-check the pinout before applying power to ensure proper operation and to avoid damaging the sensor or your power source. 🧪 Method 1: Testing On-Bench (Removed from Circuit) This method allows you to test individual KY-003 Hall Effect Sensor modules from the 10 pack before integrating them into a larger project. Testing on-bench helps to confirm the basic functionality of each sensor. This approach is particularly useful for diagnosing issues with new sensors or for verifying sensors that have been removed from a circuit. It provides a controlled environment to observe the sensor's response to a magnetic field without the complexities of a full system. Setup To set up for testing, connect the VCC pin of the KY-003 Hall Effect Sensor to a 5V power supply. Connect the GND pin to the ground of the power supply. For the OUT pin, connect it to the positive (red) probe of your multimeter, set to measure DC voltage. Connect the negative (black) probe of the multimeter to the ground of your power supply. Ensure all connections are secure on a breadboard. This setup will allow you to monitor the output voltage of the sensor. Testing Digital Sensors (Switch / Latch Type) With the KY-003 Hall Effect Sensor powered and the multimeter connected to the OUT pin, bring a magnet near the active face of the sensor. Observe the voltage reading on the multimeter. For a digital switch-type hall sensor, the output voltage should toggle between a high state (close to 5V) and a low state (close to 0V) as the magnet is brought near and then removed. The specific sensor's behaviour (latching or momentary) will determine if it stays in the triggered state after the magnet is removed.