How to Circuit a Digital Speedometer using LM324

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Digital Speedometer Circuit Diagram The circuit shown below diagrams how to make a digital speedometer which can measure up to 99kmph with a resolution of 1kmph for i.e LML Vespa, Kinetic Honda or some other vehicles using the LM324.

This digital speedometer circuit uses IC LM324 which is wired as comparator. It forms an opaque disc mounted on the spindle attached to the front wheel of the vehicle, the disc has a fixed infrared LED on one side, and a phototransistor  in line with the IR LED on the other side.

See how to calculate the speed using this device in the completed How to Circuit a Digital Speedometer of pdf filetype (source: electronicsforu.com).

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This entry was posted on Saturday, March 13th, 2010 at 12:20 am and is filed under Datasheet Application. You can follow any responses to this entry through the RSS 2.0 feed. You can skip to the end and leave a response. Pinging is currently not allowed.

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    2 Responses to “How to Circuit a Digital Speedometer using LM324”

    1. vijaya says:
      March 26, 2010 at 3:32 am

      we want programme & circuit digram for digital speedometer using 89c52

    2. Rahul says:
      April 20, 2010 at 1:50 am

      This circuit won’t work and no supply given to gates also the 556 won’t oscillate properly, ic 7447 pin connection are wrong aswell

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