商品說明
Description
Arduino magnetic reed switch module Keyes KY-021. A reed switch is a magnetic sensor that is normally open and gets closed when exposed to a magnetic field.
Specifications
The KY-021 Mini Magnetic Reed Switch Module consists of a 10kΩ resistor and a small reed switch actuated by a magnetic field, commonly used in mechanical systems as proximity sensors. Compatible with popular electronic platforms like Arduino, Teensy and ESP8266.
Operating Voltage | 3.3V to 5v |
Output Type | Digital |
KY-021 Connection Diagram
Connect the module’s Power line (middle) and ground (-) to +5 and GND respectively. Connect signal (S) to pin 2 on the Arduino.
KY-021 | Arduino |
S | 2 |
middle | +5V |
– | GND |

KY-021 Arduino Example Code
The following sketch will turn on the pin 13 LED on the Arduino when the module detects a magnetic field. Place a magnet near the KY-021 to activate the reel switch.
int led = 13; // LED pin
int reelSwitch = 2; // magnetic senso rpin
int switchState; // variable to store reel switch value
void setup()
{
pinMode (led, OUTPUT);
pinMode (reelSwitch, INPUT);
}
void loop()
{
switchState = digitalRead(reelSwitch); // read the value of digital interface 2 and assign it to switchState
if (switchState == HIGH) // when the magnetic sensor detect a signal, LED is flashing
{
digitalWrite(led, HIGH);
}
else
{
digitalWrite(led, LOW);
}
}
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