28mm Reed Switch NO 2 Pin

 A reed switch is an electromechanical switching device commonly used for switching low voltage and current circuits. It consists of two flexible metal strips (reeds) made of ferromagnetic material, enclosed in a glass tube. The reed switch operates by closing or opening the contacts when an external magnetic field is applied.

Key Features:

1. Magnetic Interaction: The reed switch operates via magnetic fields. When a magnetic field is applied (e.g., bringing a magnet close), the metal strips inside make contact and close the circuit. When the magnetic field is removed, the strips separate, opening the circuit.
2. Types: There are several types, including Normally Open (NO), Normally Closed (NC), and Changeover (SPDT). In an NO type, the circuit closes when a magnetic field is applied; in an NC type, the circuit opens when a magnetic field is applied.
3. Durability: The glass tube protects the metal strips from environmental factors, increasing the switch's durability and reliability.
4. Compact Size: The small and lightweight design makes the reed switch suitable for various electronic and mechanical systems.

Technical Specifications:

• Voltage Range: 3.3V ~ 60VDC
• Load Current Max.: 2.5A
• Switching Current: 1.0A
• Max Contact Rating: 30W
• Response Frequency: 2200Hz
• Mech. & Electrical Lifecycle: ≈ 100,000
• Contact Resistance: 200mΩ
• Insulation Resistance: 10Ω
• Operating Temperature Range: -50 to 140°C
• Length: 28 mm
• Approx Weight: 2 gm

Applications:

1. Sensor Systems: Used in door and window alarm sensors, bicycle speedometers, and to detect the presence or absence of a magnetic field.
2. Electronic Devices: Employed in computer keyboards, household appliances, medical devices, and various electronic gadgets.
3. Automotive Industry: Used to detect the position of doors, seat belts, and other movable parts in vehicles.
4. Industrial Automation: Utilized for position and movement detection in industrial machines and equipment.

Advantages:

• Electrical Isolation: The glass tube isolates the contacts from environmental factors, ensuring high reliability.
• Low Power Consumption: Operates with low power due to its magnetic operation.
• Long Lifespan: Minimal wear and tear since there are no mechanical contacts, leading to a long operational life.
• High-Speed Switching: Responds within milliseconds, suitable for applications requiring quick switching.

Disadvantages:

• Magnetic Interference: Can be affected by nearby magnetic fields, causing unwanted switching.
• Fragility: The glass tube can be fragile and prone to damage from physical impact.
• Limited Current Capacity: Not suitable for high current applications.

Example Connection:

You can use a reed switch with an Arduino to create a simple circuit, such as turning on an LED when the reed switch is activated:

int reedPin = 2; // Pin connected to the reed switch
int ledPin = 13; // Pin connected to the LEDvoid setup() {
 pinMode(reedPin, INPUT);
 pinMode(ledPin, OUTPUT);
}void loop() {
 int reedState = digitalRead(reedPin); // Read the state of the reed switch
 if (reedState == HIGH) {
   digitalWrite(ledPin, HIGH); // Turn on the LED
 } else {
   digitalWrite(ledPin, LOW); // Turn off the LED
 }
}

 A reed switch is a versatile and reliable switching device that operates using a magnetic field. It is ideal for low voltage and current applications and is widely used in sensor systems, electronic devices, the automotive industry, and industrial automation. The advantages include low power consumption, high reliability, and a long lifespan. However, they can be affected by magnetic interference and are not suitable for high current applications. The compact and durable design makes reed switches an essential component in many applications.