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

Reed sensors to control Automobile Sun-roofs

automotive sunroof
Automobile Sun Roof

An automotive sun-roof, usually made of tinted glass, is a movable panel that can be opened or closed, fully or partially, and allows light and/or fresh air to enter the vehicle. Cars and trucks with sun-roofs, or moon-roofs, as they are so marketed now, are operated with four separate or combined switches, two that are used to open or close the roof fully, and the other two to open or close the roof partially. Sensing the end positions of the fully open or fully closed state is straightforward and can be accomplished with two Reed Sensors at the end positions with a magnet mounted on the moving roof rail assembly. For the partial control of the roof, a reed sensor and a magnet are mounted permanently within the actuating distance range, and a vane mounted to the roof belt assembly breaks the actuation between the Reed Sensor and magnet assembly for every rotation of the roof motor. The number of rotations taken to open and close the roof fully are known and the number of intermediary pulses received by the microprocessor helps display the exact extent of how much the roof has been opened or closed and also when it will be reaching full closure or full open states. Molded Reed Sensors with highly controlled sputtered coatings, work very well in such pulse counting applications.

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.

Pulse Counting Type

Speedometer pulse counting Reed Switches have a very high operating frequency and this feature lends itself to...Continue reading ->

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.

R3 Miniature SMD Reed Sensor

Miniature Reed Sensor Omni polar, normally open (NO), 16.25 mm SMD and low-profile SMD pitch. 10 W...Continue reading ->

MM-1018 Micro Miniature Reed Switch

Micro Miniature Reed Switch Size This is durable and reliable, Form A type 10.0 mm Micro Miniature reed switch...Continue reading ->

MS-212 Ultra-miniature Cylindrical Sensor

Ultra miniature cylindrical sensor icon Diameter 2.6 mm x 12 mm long, omni polar, switches loads of up to...Continue reading ->

MS-214 Miniature Cylindrical Sensor

Miniature cylindrical sensor icon Diameter 4 mm x 25 mm long, omni polar, switches loads of up to...Continue reading ->