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

Magnet sensors in Bicycle Speedometers

Reed switches in bicycle speedometer
Bicycle Speedometer

Fitness is always in, and people who exercise always need feedback on how many calories they have burnt, or how many kilometers one has cycled or how fast they were going etc. Bicycle manufacturers have tuned in to these requirements and have made sure that the cycles sold provide a lot of information.

This is where Magnet Sensors are useful. Reed Switch based Magnet sensors are used to display the speed of the wheel which is then translated by the on-board microprocessor to other information such as calories burnt, top speed, average speed and even pushed to hand held devices. The wheel speed is sensed by securing two magnets to opposite ends of the wheel and with the sensor mounted near the brake pads, to generate a square wave output that is fed to the microprocessor. This in turn is used to trigger other information, for example to start a timer to keep track of start and end times, which is then used with owner information such as height, weight age and sex, to calculate calories burnt.

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.

RM-1318 Reduced Miniature Reed Switch

Reduced Miniature Reed Switch Size The RM-1318 is a robust and reliable, Form A type 13.0 mm Reduced Miniature...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 ->

MS-216 Standard size Cylindrical Sensor

standard size cylindrical sensor icon Diameter 6mm x 25 mm long, omni polar, switches loads of up to 10W,...Continue reading ->

MS-225, M5 Threaded Cylindrical Sensor

M5 threaded cylindrical sensor Omni polar, 0.5 mm pitch M5 thread for accurate positioning and locking, switches loads...Continue reading ->