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Large Reed Module (KY-025) สวิตช์แม่เหล็ก เป็นสวิตซ์ที่จะทำงานเมื่อมีแม่เหล็กมาอยู่ใกล้ๆ นิยมนำไปใช้งานตรวจสอบการเปิด-ปิดประตู ใช้ไฟเลี้ยง 3.3-5V


Reed switch is a kind of passive electronic switching component with contacts with a simple structure, small size and easy to control. It consists of a sealed glass envelope where there are two ferrous elastic reeds and is filled with inert gas called rhodium. Normally, the two reeds are separated in the envelope. When a magnetic substance approaches to the glass envelope, the reeds will come together due to the magnetic field thus completing an electric circuit. When the external magnetic field disappears, two reeds will be separated because of their elasticity, the circuit is also disconnected. Therefore, as a circuit switching device controlled by magnetic field signals, reed switch can also be used as a sensor for counting and limiting, etc. ( applied in the security systems, mainly used for production of door and window magnets), and it is also widely used in a variety of communications devices. In practice, it is common to use the two permanent magnets to control connection of two metal sheets, thus it is also called a "magnetron.".

Features :
- Imported normally-open reed
- Comparator output, clear signal, nice waveform and driving ability, more than 15mA.
- Working voltage: 3.3V-5V
- Output format: Digital output (0 and 1) and analog (0-1023)
- With fix bolt holes for easy installation
- Small PCB size: 32mm x 14mm
- Adopting LM393 comparator with wide voltage
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