# Time Delay For Pulse Trigger Digital Output **URL:** \ **Category:** General\ **Created:** [21 September 2018 05:46 UTC](https://discourse.nodered.org/t/time-delay-for-pulse-trigger-digital-output/3317 "2018-09-21T05:46:55Z")\ **Posts on this page:** 5\ **Page:** 1

**Author:** ![mrizkywiguna](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/mrizkywiguna/32/32016_2.png) [@mrizkywiguna](https://discourse.nodered.org/u/mrizkywiguna)\ **Post date:** [21 September 2018 05:46 UTC](https://discourse.nodered.org/t/time-delay-for-pulse-trigger-digital-output/3317/1 "2018-09-21T05:46:55Z")

Hi All, I'm stuck in delay function for pulse delay signal High and Low. I've tried trigger node, but i cant control the low signal time. So, i want control relay with specific time in high position and low position. ![image](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/2X/5/5af32cb8669b4260e3ccc74912beba2d3cd938d2.png) `[{"id":"b906ff4d.da3d3","type":"ui_chart","z":"c5964b54.39bb98","name":"","group":"6a67f261.dd3924","order":0,"width":"0","height":"0","label":"Pressure Intake Real","chartType":"line","legend":"false","xformat":"HH:mm:ss","interpolate":"linear","nodata":"","dot":false,"ymin":"","ymax":"","removeOlder":"4","removeOlderPoints":"","removeOlderUnit":"3600","cutout":0,"useOneColor":false,"colors":["#1f77b4","#aec7e8","#ff7f0e","#2ca02c","#98df8a","#d62728","#ff9896","#9467bd","#c5b0d5"],"useOldStyle":false,"x":853.0000076293945,"y":269.3333692550659,"wires":[[],[]]},{"id":"7c278af4.03c094","type":"comment","z":"c5964b54.39bb98","name":"0 = ON ; 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Realtime","tab":"178311c4.46912e","disp":true,"width":"6","collapse":false},{"id":"7a22729d.02c024","type":"modbus-client","z":"","name":"GDM Tipe B","clienttype":"simpleser","bufferCommands":true,"stateLogEnabled":false,"tcpHost":"127.0.0.1","tcpPort":"502","tcpType":"DEFAULT","serialPort":"/dev/ttyUSB0","serialType":"RTU","serialBaudrate":"9600","serialDatabits":"8","serialStopbits":"1","serialParity":"none","serialConnectionDelay":"100","unit_id":"6","commandDelay":"1","clientTimeout":"1000","reconnectTimeout":"2000"},{"id":"ddeba1c2.c1e0f8","type":"ui_group","z":"","name":"Downhole Sensor Realtime Data","tab":"178311c4.46912e","disp":true,"width":"6","collapse":false},{"id":"523f1271.dae8dc","type":"ui_group","z":"","name":"Pressure Intake Real Time","tab":"178311c4.46912e","disp":true,"width":"6","collapse":false},{"id":"178311c4.46912e","type":"ui_tab","z":"","name":"Downhole Sensor","icon":"dashboard"}]` Regards, wiguna ---

**Author:** ![cymplecy](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/cymplecy/32/2773_2.png) [@cymplecy](https://discourse.nodered.org/u/cymplecy)\ **Post date:** [21 September 2018 06:25 UTC](https://discourse.nodered.org/t/time-delay-for-pulse-trigger-digital-output/3317/2 "2018-09-21T06:25:03Z")

here's a couple of examples to produce pulses of defined 1/0 times the top one will produce a 1 for 3 secs and a 0 for 1 sec the bottom one will produce a continuous train of pulses like that ![image](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/2X/3/3fc03115a10b466385504b38ff86dfb48fcd8f03.png) ``` [{"id":"43eda91e.221358","type":"inject","z":"e4e1f6c6.d50648","name":"","topic":"","payload":"start","payloadType":"str","repeat":"","crontab":"","once":false,"onceDelay":0.1,"x":230,"y":180,"wires":[["6c4ea6e1.a2d528","474d7dbb.e90f64"]]},{"id":"6c4ea6e1.a2d528","type":"trigger","z":"e4e1f6c6.d50648","op1":"1","op2":"0","op1type":"num","op2type":"num","duration":"3","extend":false,"units":"s","reset":"","bytopic":"all","name":"","x":480,"y":160,"wires":[["d64ef6b.74d3908"]]},{"id":"474d7dbb.e90f64","type":"trigger","z":"e4e1f6c6.d50648","op1":"","op2":"finished","op1type":"nul","op2type":"str","duration":"4","extend":false,"units":"s","reset":"","bytopic":"all","name":"","x":480,"y":220,"wires":[["d64ef6b.74d3908"]]},{"id":"d64ef6b.74d3908","type":"debug","z":"e4e1f6c6.d50648","name":"","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"false","x":950,"y":180,"wires":[]},{"id":"cf90e92d.32c6a8","type":"inject","z":"e4e1f6c6.d50648","name":"","topic":"","payload":"start","payloadType":"str","repeat":"","crontab":"","once":false,"onceDelay":0.1,"x":90,"y":380,"wires":[["80fd4145.02be7"]]},{"id":"80fd4145.02be7","type":"trigger","z":"e4e1f6c6.d50648","op1":"1","op2":"0","op1type":"num","op2type":"num","duration":"3","extend":false,"units":"s","reset":"","bytopic":"all","name":"","x":620,"y":380,"wires":[["3e263cde.16c344","95500936.6dd878"]]},{"id":"3e263cde.16c344","type":"debug","z":"e4e1f6c6.d50648","name":"","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"false","x":950,"y":380,"wires":[]},{"id":"14cfbea5.9851f1","type":"delay","z":"e4e1f6c6.d50648","name":"","pauseType":"delay","timeout":"1","timeoutUnits":"seconds","rate":"1","nbRateUnits":"1","rateUnits":"second","randomFirst":"1","randomLast":"5","randomUnits":"seconds","drop":false,"x":500,"y":460,"wires":[["80fd4145.02be7"]]},{"id":"95500936.6dd878","type":"switch","z":"e4e1f6c6.d50648","name":"","property":"payload","propertyType":"msg","rules":[{"t":"eq","v":"0","vt":"num"}],"checkall":"true","repair":false,"outputs":1,"x":730,"y":460,"wires":[["14cfbea5.9851f1"]]},{"id":"1bfc8878.37cde8","type":"inject","z":"e4e1f6c6.d50648","name":"reset","topic":"","payload":"","payloadType":"date","repeat":"","crontab":"","once":false,"onceDelay":0.1,"x":90,"y":460,"wires":[["4b2947a2.e420f8"]]},{"id":"4b2947a2.e420f8","type":"change","z":"e4e1f6c6.d50648","name":"","rules":[{"t":"set","p":"reset","pt":"msg","to":"true","tot":"bool"}],"action":"","property":"","from":"","to":"","reg":false,"x":240,"y":460,"wires":[["80fd4145.02be7","14cfbea5.9851f1"]]}] ``` ---

**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:** [21 September 2018 08:11 UTC](https://discourse.nodered.org/t/time-delay-for-pulse-trigger-digital-output/3317/3 "2018-09-21T08:11:11Z")

Errr. why not just use a repeating inject set for the overall period... and single trigger node ? ![image](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/2X/5/5857146713938ed317081fd42d0f780fcf563c55.png) ```auto [{"id":"fc1d822d.5bd83","type":"inject","z":"dfe4ec36.0a5a5","name":"4 secs","topic":"","payload":"1","payloadType":"num","repeat":"4","crontab":"","once":false,"onceDelay":0.1,"x":550,"y":580,"wires":[["ee6bdd03.70486"]]},{"id":"ee6bdd03.70486","type":"trigger","z":"dfe4ec36.0a5a5","op1":"1","op2":"0","op1type":"num","op2type":"num","duration":"3","extend":false,"units":"s","reset":"","bytopic":"all","name":"","x":700,"y":580,"wires":[["7c25a8e4.81d748"]]},{"id":"7c25a8e4.81d748","type":"debug","z":"dfe4ec36.0a5a5","name":"","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"false","hideButton":false,"x":870,"y":580,"wires":[]}] ``` ---

**Author:** ![hotNipi](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/hotnipi/32/383_2.png) [@hotNipi](https://discourse.nodered.org/u/hotNipi)\ **Post date:** [21 September 2018 09:03 UTC](https://discourse.nodered.org/t/time-delay-for-pulse-trigger-digital-output/3317/4 "2018-09-21T09:03:15Z")

Safety time ⚡ I do like the simplicity of the solution of @dceejay🙂 But for elementary safety reasons it should never used **directly** in real application with **real equipment**. There should be some easy way option to stop the timer at any point of time If flow is running, the interruption of running timer should be avoided. (inject node allows re-trigger with button) Safety first 🙂 ---

**Author:** ![mrizkywiguna](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/mrizkywiguna/32/32016_2.png) [@mrizkywiguna](https://discourse.nodered.org/u/mrizkywiguna)\ **Post date:** [21 September 2018 14:12 UTC](https://discourse.nodered.org/t/time-delay-for-pulse-trigger-digital-output/3317/5 "2018-09-21T14:12:01Z")

Hi All, Thank you for all advice. Now i can make the time for high and low. This signal using to rise/lower frequency variable speed drive, so there is need to setup specific time to make the drive working fine. The minimum length of time for change the frequency is 0.1 ms for trigger and 10 s to make up & down frequency very slow. ![image](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/2X/3/34b7618ee4659e9ffceab84dab7ca07d96dc5cb2.png) > [@](#): > > [{"id":"ba4e00e6.0f922","type":"rpi-gpio out","z":"c5964b54.39bb98","name":"","pin":"13","set":false,"level":"1","freq":"","out":"out","x":858.3332443237305,"y":612.0833377838135,"wires":},{"id":"655cd2e0.eba1ac","type":"function","z":"c5964b54.39bb98","name":"Lower","func":"var setpoint = global.get("setpoint");\nvar pi=global.get("pi");\n\nif (setpoint \> pi)\n{\n return {payload: "1"}\n} \n\nelse {\n return {payload: "0"}\n}\n\n\n","outputs":1,"noerr":0,"x":327.0000534057617,"y":617.7500247955322,"wires":[["31265d1e.b2e7f2"]]},{"id":"c302717e.63c6a","type":"inject","z":"c5964b54.39bb98","name":"hold 10 s","topic":"","payload":"","payloadType":"date","repeat":"10","crontab":"","once":false,"onceDelay":0.1,"x":147.00005340576172,"y":617.7500247955322,"wires":[["655cd2e0.eba1ac"]]},{"id":"31265d1e.b2e7f2","type":"delay","z":"c5964b54.39bb98","name":"low\_delay","pauseType":"delay","timeout":"10","timeoutUnits":"seconds","rate":"1","nbRateUnits":"0.1","rateUnits":"second","randomFirst":"1","randomLast":"5","randomUnits":"seconds","drop":false,"x":551.1668014526367,"y":618.861047744751,"wires":[["ba4e00e6.0f922"]]},{"id":"4d549952.2d5948","type":"delay","z":"c5964b54.39bb98","name":"high\_delay","pauseType":"delay","timeout":"0.1","timeoutUnits":"seconds","rate":"1","nbRateUnits":"1","rateUnits":"second","randomFirst":"1","randomLast":"5","randomUnits":"seconds","drop":false,"x":560.8889694213867,"y":659.972131729126,"wires":[["ba4e00e6.0f922"]]},{"id":"e14c866e.f75b88","type":"inject","z":"c5964b54.39bb98","name":"","topic":"","payload":"0","payloadType":"str","repeat":"0.1","crontab":"","once":false,"onceDelay":0.1,"x":344.50008392333984,"y":661.0833072662354,"wires":[["4d549952.2d5948"]]}]