Reed sensors for detecting Ignition Key
The Ignition key on an automobile comes in two types, a manual key or a start button as is the case in the newer vehicles using key-less entry system. This ignition switch, enabled with the a turn of the key or the press of the switch, enables the control system that activates the main electrical systems that allow the engine to the be started, the use of power windows, parking lights, and the media player.
When one of these items are turned on, the driver must be reminded not to leave the vehicle as it would drain the battery, or worse, someone could drive away with the car. To prevent this, the collective inputs of various sensors help the microprocessor give out an audio-visual alarm when the driver gets up from the seat.
Firstly, the seating sensor, which consists of a reed sensor and magnet under the seat, gets deactivated when the driver gets up. Secondly, the ignition key position is checked by means of a reed sensor and magnet, that is in an actuated state if the key is fully inserted. As long as the ignition key sensor is not actuated means that the driver has removed it, thereby cutting power to the vehicle, and is promptly going to lock it. This situation does not give any alarm. In some cars, the power window positions are also checked at this time to alert the driver if any of the windows are open.
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 type application When an application requires the end position of a movement sensed, or the sensing of a part when it Continue reading Nov 7, 2020 |
Recommended Products
The Reed Switches and Sensors used in such applications need 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
 | 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
 | 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
 | 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
 | MS-212 Magnet Sensor Drawing starFeatures10W Contact Rating. Normally Open contact. Two sensitivity bands. Sputtered Ruthenium Continue reading Oct 30, 2020 |