KY-003 Hall Magnetic Sensor Module
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Overview
About KY-003 Hall Magnetic Sensor Module
The KY-003 is a Hall-effect sensor module designed to detect magnetic fields using the A3144 Hall-effect sensor. It outputs a digital signal when exposed to a magnetic field, making it ideal for proximity sensing, speed detection, and position tracking in electronic projects.
⚡ Key Features
- Magnetic Field Detection – Activates when a magnet is near the sensor.
- A3144 Hall-Effect Sensor – Provides reliable digital output.
- Simple Interface – Easily integrates with ESP32, Arduino, and other microcontrollers.
- Low Power & Compact Design – Ideal for embedded and battery-powered applications.
- Versatile Applications – Used in speed sensing, position tracking, and magnetic switches.
With its compact design and reliable detection capabilities, the KY-003 is perfect for automation, robotics, and security systems. 🚀
Get Your KY-003
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$2 per unit
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KY-003 Specifications
Complete technical specification details for KY-003 Hall Magnetic Sensor Module
📊 Technical Parameters
KY-003 Pinout
The **KY-003** is a 3-pin Hall-effect magnetic field sensor module (A3144 chip):
Visual Pinout Diagram
Pin Types
Quick Tips
**Interface**: Digital output (active low on magnetic field),🧲 **Sensor**: A3144 Hall-effect sensor chip
**Detection**: Responds to south pole of magnet,⚡ **Power**: 3.3V or 5V operation
**Low Power**: Minimal current consumption,🎯 **Applications**: Speed sensing, position tracking, proximity detection, magnetic switches
Pin Descriptions
| Pin Name | Type | Description | Notes |
|---|---|---|---|
1 Pin (-) | Power | Ground connection | |
2 Pin (+) | Power | Power supply | 3.3V or 5V |
3 Pin (S) | Communication | Digital signal output | Goes LOW when magnetic field detected |
Wiring KY-003 to ESP32
To interface the **KY-003** with an **ESP32** for magnetic field detection:
Visual Wiring Diagram
Connection Status
Protocol
Pin Connections
| KY-003 Pin | Connection | ESP32 Pin | Description |
|---|---|---|---|
1 Pin (-) Required | GND | Ground | |
2 Pin (+) Required | 3.3V or 5V | Power supply | |
3 Pin (S) Required | GPIO4 | Digital input (any GPIO) |
**GPIO Selection**: Any digital GPIO pin works, GPIO4 is just an example
**Voltage**: Use 3.3V for ESP32 compatibility
**Magnet**: Use a permanent magnet (neodymium works well)
**Distance**: Detection range typically 1-15mm depending on magnet strength
KY-003 Troubleshooting
Common issues and solutions to help you get your sensor working
Common Issues
Issue: The module does not detect any magnetic fields.
Solutions:
- Verify all connections are secure and correctly placed.
- Ensure the module is receiving the appropriate voltage (3.3V or 5V).
- Check the microcontroller's GPIO pin configuration in the code.
- Test the module with a known magnetic source to confirm functionality.
Issue: The module sends signals without any actual magnetic field present.
Solutions:
- Reduce environmental electromagnetic interference that might affect the sensor.
- Implement software debouncing to filter out spurious signals.
- Ensure the module is securely mounted to prevent unintended movements.
Debugging Tips
Use the Serial Monitor to check for error messages and verify the sensor's output. Add debug prints in your code to track the sensor's state.
Use a multimeter to verify voltage levels and check for continuity in your connections. Ensure the power supply is stable and within the sensor's requirements.
Additional Resources
KY-003 Programming Examples
Ready-to-use code examples for different platforms and frameworks
#define HALL_SENSOR_PIN 7
#define LED_PIN 13
void setup() {
pinMode(HALL_SENSOR_PIN, INPUT);
digitalWrite(HALL_SENSOR_PIN, HIGH); // Enable internal pull-up resistor
pinMode(LED_PIN, OUTPUT);
Serial.begin(9600);
Serial.println("KY-003 Hall Magnetic Sensor Test");
}
void loop() {
int sensorValue = digitalRead(HALL_SENSOR_PIN);
if (sensorValue == LOW) {
Serial.println("Magnetic field detected");
digitalWrite(LED_PIN, HIGH);
} else {
Serial.println("No magnetic field detected");
digitalWrite(LED_PIN, LOW);
}
delay(1000);
}This Arduino code sets up the KY-003 Hall Magnetic Sensor on pin 7 and an LED on pin 13. When a magnetic field is detected, the sensor outputs a LOW signal, triggering the LED to turn on and a message to be printed to the serial monitor.
#include <stdio.h>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "driver/gpio.h"
#define HALL_SENSOR_PIN GPIO_NUM_4
#define LED_PIN GPIO_NUM_2
void app_main(void) {
gpio_set_direction(HALL_SENSOR_PIN, GPIO_MODE_INPUT);
gpio_set_pull_mode(HALL_SENSOR_PIN, GPIO_PULLUP_ONLY);
gpio_set_direction(LED_PIN, GPIO_MODE_OUTPUT);
printf("KY-003 Hall Magnetic Sensor Test\n");
while (1) {
int sensor_value = gpio_get_level(HALL_SENSOR_PIN);
if (sensor_value == 0) {
printf("Magnetic field detected\n");
gpio_set_level(LED_PIN, 1);
} else {
printf("No magnetic field detected\n");
gpio_set_level(LED_PIN, 0);
}
vTaskDelay(pdMS_TO_TICKS(1000));
}
}This ESP-IDF code configures GPIO4 as an input for the KY-003 Hall Magnetic Sensor and GPIO2 as an output for an LED. When a magnetic field is detected (sensor outputs LOW), the LED turns on, and a message is printed to the console.
binary_sensor:
- platform: gpio
pin:
number: GPIO4
mode: INPUT_PULLUP
name: "KY-003 Hall Magnetic Sensor"
filters:
- delayed_on: 10ms
- delayed_off: 10ms
on_press:
- then:
- lambda: |-
ESP_LOGD("sensor", "Magnetic field detected!");This ESPHome configuration sets up the KY-003 Hall Magnetic Sensor as a binary sensor on GPIO4 with an internal pull-up resistor. It applies filtering to debounce false triggers and logs when a magnetic field is detected.
platformio.ini
[env:esp32]
platform = espressif32
board = esp32dev
framework = arduinomain.cpp
#include <Arduino.h>
#define HALL_SENSOR_PIN 4
#define LED_PIN 2
void setup() {
pinMode(HALL_SENSOR_PIN, INPUT_PULLUP);
pinMode(LED_PIN, OUTPUT);
Serial.begin(115200);
Serial.println("KY-003 Hall Magnetic Sensor Test");
}
void loop() {
if (digitalRead(HALL_SENSOR_PIN) == LOW) {
Serial.println("Magnetic field detected");
digitalWrite(LED_PIN, HIGH);
} else {
Serial.println("No magnetic field detected");
digitalWrite(LED_PIN, LOW);
}
delay(1000);
}This PlatformIO code configures the KY-003 Hall Magnetic Sensor on GPIO4 and an LED on GPIO2. When a magnetic field is detected, the LED turns on, and a message is printed to the serial monitor.
import machine
import time
HALL_SENSOR_PIN = machine.Pin(4, machine.Pin.IN, machine.Pin.PULL_UP)
LED_PIN = machine.Pin(2, machine.Pin.OUT)
while True:
if HALL_SENSOR_PIN.value() == 0:
print("Magnetic field detected")
LED_PIN.on()
else:
print("No magnetic field detected")
LED_PIN.off()
time.sleep(1)This MicroPython script configures the KY-003 Hall Magnetic Sensor on GPIO4 and an LED on GPIO2. When a magnetic field is detected (LOW signal), the LED turns on, and a message is printed to the console.
Wrapping Up KY-003
The ESP32 KY-003 Hall Magnetic Sensor Module is a powerful KY-0xx module sensor that offers excellent performance and reliability. With support for multiple development platforms including Arduino, ESP-IDF, ESPHome, PlatformIO, and MicroPython, it's a versatile choice for your IoT projects.
Best Practices
For optimal performance, ensure proper wiring and follow the recommended configuration for your chosen development platform.
Safety First
Always verify power supply requirements and pin connections before powering up your project to avoid potential damage.
Ready to Start Building?
Now that you have all the information you need, it's time to integrate the KY-003 into your ESP32 project and bring your ideas to life!
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