# Pulse output dynamic time for relais

**URL:** <https://discourse.nodered.org/t/pulse-output-dynamic-time-for-relais/33467>\
**Category:** General\
**Created:** [28 September 2020 18:41 UTC](https://discourse.nodered.org/t/pulse-output-dynamic-time-for-relais/33467 "2020-09-28T18:41:03Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Jurg1505](https://avatars.discourse-cdn.com/v4/letter/j/3ab097/32.png) [@Jurg1505](https://discourse.nodered.org/u/Jurg1505)\
**Post date:** [28 September 2020 18:41 UTC](https://discourse.nodered.org/t/pulse-output-dynamic-time-for-relais/33467/1 "2020-09-28T18:41:03Z")

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Hello,  
How to make a pulse output where the 1 time is 250 milli seconds and the 0 time is dynamic.  
The 0 time can variate from 0.75 seconds to 5 seconds.

The output is for a diaphragm pump.

 ![Knipsel](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/3/4/347a34154127277a53d4a0146a1c9eca1290831d.png)

Or set the frequency on PWM output.

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**Author:** ![janvda](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/janvda/32/234_2.png) [@janvda](https://discourse.nodered.org/u/janvda)\
**Post date:** [28 September 2020 19:15 UTC](https://discourse.nodered.org/t/pulse-output-dynamic-time-for-relais/33467/2 "2020-09-28T19:15:10Z")

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Maybe you can use the delay node for that.  
See also recent discussion : [Delay node with variable delay](https://discourse.nodered.org/t/delay-node-with-variable-delay/18486)

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**Author:** ![dceejay](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/dceejay/32/38_2.png) [@dceejay](https://discourse.nodered.org/u/dceejay)\
**Post date:** [28 September 2020 19:18 UTC](https://discourse.nodered.org/t/pulse-output-dynamic-time-for-relais/33467/3 "2020-09-28T19:18:22Z")

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... followed by a trigger node set to 250mS for the actual pulse.

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**Author:** ![system](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/1X/d073cd938eafa2e558d7c2cd59003b3ef4963033.png) [@system](https://discourse.nodered.org/u/system)\
**Post date:** [27 November 2020 19:18 UTC](https://discourse.nodered.org/t/pulse-output-dynamic-time-for-relais/33467/4 "2020-11-27T19:18:26Z")

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