Reed Relays and
Electronics India Limited
Manufacturer of Reed Switches, Reed Sensors and Reed-based products
Reed Relays and Electronics India Limited Incorporated in 1971

Ignition detection in Keys using Reed Sensors

key ignition
Automobile Key

In ignition detection in automobile, two primary types reign supreme: the traditional manual key and the more modern start button, favoured by newer vehicles equipped with keyless entry systems. Whether it’s the familiar twist of a key or the simple press of a button, the ignition switch serves as the gateway to activating the vehicle’s main electrical systems, thereby initiating essential functions such as engine start-up, power window operation, activation of parking lights, and control of the media player.

However, with convenience comes the potential for oversight. In the event that the driver inadvertently leaves the vehicle with the ignition or accessory systems engaged, the consequences can range from a drained battery to the risk of theft. To mitigate such risks, sophisticated ignition detection systems come into play.

Utilizing seat sensing technology, these systems monitor the driver’s presence and activity within the vehicle cabin. When the driver attempts to exit the vehicle while the ignition detection or accessory systems are still engaged, a network of sensors collaborates with a microprocessor to trigger an audio-visual alarm, alerting the driver to the oversight.

Furthermore, to prevent unauthorized use of the vehicle, additional layers of security are implemented. A reed sensor and magnet setup discreetly installed beneath the driver’s seat detects changes in seating position, automatically deactivating when the driver vacates the seat. Similarly, another reed sensor and magnet arrangement assesses the position of the ignition key, ensuring that power is cut off from the vehicle when the key is removed.

Application Classification

Applications are classified as Position Sensing, Pulse Counting, Electromagnetic or Relay, Temperature Sensing or Magnet Biasing types. This application is classified as follows and the link gives more information on best practices to help select the most suitable AT band and matching magnet.

Position sensing Type

Position sensing Position Sensing type application When an application requires the end position of a movement sensed, or the sensing of a part when it Continue reading ->

Jun 20, 2024

The Reed Switches and Sensors used in this ignition detection application needs to be robust, durable and efficient in meeting a high life expectancy. Our engineers work hard in life testing our products under various conditions, and our intention is to ensure end product durability and life. Although we wouldn’t want to restrict any of our products for use in only certain applications, the recommended products for use in this application are listed below.

R5 Ultra-Miniature SMD Reed Sensor

Ultra miniature smd reed sensor These SMD Ultra-Miniature Reed Sensors are designed for signal switching applications and have a size advantage over the standard size SMD Continue reading ->

Jun 7, 2021

UM-0018-M Ultra Miniature Reed Switch

Ultra Miniature Reed Switch Size 5 mm This highly sensitive, Form A type, UM-0018-M Ultra Miniature Reed Switches are designed for switching high speed signal loads with an Continue reading ->

Nov 8, 2022

UM-0018-H Ultra Miniature Reed Switch

Ultra Miniature Reed Switch Size 7 mm These highly sensitive, Ultra Miniature Form A reed switches are designed for low power, high speed switching applications and Continue reading ->

Nov 8, 2022

MS-212 Ultra-miniature Cylindrical Sensor

Ultra miniature cylindrical sensor icon MS-212 Magnet Sensor Drawing starFeatures10W Contact Rating. Normally Open contact. Two sensitivity bands. Sputtered Ruthenium Continue reading ->

Oct 30, 2020