# Speed sensing

**URL:** <https://forum.arduino.cc/t/speed-sensing/409837>\
**Category:** General Guidance\
**Created:** [September 26, 2016, 12:44pm UTC](https://forum.arduino.cc/t/speed-sensing/409837 "2016-09-26T12:44:59Z")\
**Posts on this page:** 7\
**Page:** 1

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**Author:** ![vvilokk](https://avatars.discourse-cdn.com/v4/letter/v/91b2a8/32.png) [@vvilokk](https://forum.arduino.cc/u/vvilokk)\
**Post date:** [September 26, 2016, 12:44pm UTC](https://forum.arduino.cc/t/speed-sensing/409837/1 "2016-09-26T12:44:59Z")

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I need to make a speed sensor using arduino uno and reed switch without the use of timer. Can anyone help me with it ?

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**Author:** ![septillion](https://avatars.discourse-cdn.com/v4/letter/s/c5a1d2/32.png) [@septillion](https://forum.arduino.cc/u/septillion)\
**Post date:** [September 26, 2016, 12:46pm UTC](https://forum.arduino.cc/t/speed-sensing/409837/2 "2016-09-26T12:46:56Z")

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Yeah, sure. Just post you schematic (NO Fritzing), code you already have and the problems you are experiencing.

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**Author:** ![graynomad](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/graynomad/32/213871_2.png) [@graynomad](https://forum.arduino.cc/u/graynomad)\
**Post date:** [September 26, 2016, 1:01pm UTC](https://forum.arduino.cc/t/speed-sensing/409837/3 "2016-09-26T13:01:40Z")

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> without the use of timer

One way or another you have to do some timing. do you mean not using one of the hardware timer/counters in the CPU?

But as mentioned. what have you tried so far?

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**Author:** ![Paul\_KD7HB](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/paul_kd7hb/32/1127958_2.png) [@Paul\_KD7HB](https://forum.arduino.cc/u/Paul_KD7HB)\
**Post date:** [September 26, 2016, 7:24pm UTC](https://forum.arduino.cc/t/speed-sensing/409837/4 "2016-09-26T19:24:43Z")

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Are you really looking for speed: distance / time, or are you looking for revolutions of some object / time?

Paul

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**Author:** ![anon94801460](https://avatars.discourse-cdn.com/v4/letter/a/278dde/32.png) [@anon94801460](https://forum.arduino.cc/u/anon94801460)\
**Post date:** [September 26, 2016, 10:28pm UTC](https://forum.arduino.cc/t/speed-sensing/409837/5 "2016-09-26T22:28:59Z")

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What does the reed switch do?

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**Author:** ![allanhurst](https://avatars.discourse-cdn.com/v4/letter/a/3ec8ea/32.png) [@allanhurst](https://forum.arduino.cc/u/allanhurst)\
**Post date:** [September 26, 2016, 10:35pm UTC](https://forum.arduino.cc/t/speed-sensing/409837/6 "2016-09-26T22:35:30Z")

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We'll need an awful lot more detail to be able to help you...........

regards Allan

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**Author:** ![system](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/system/32/1140315_2.png) [@system](https://forum.arduino.cc/u/system)\
**Post date:** [May 5, 2021, 5:58pm UTC](https://forum.arduino.cc/t/speed-sensing/409837/7 "2021-05-05T17:58:57Z")

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Closed on May 5, 2021, 5:58pm UTC