# MaxMin Thermometer reset

**URL:** <https://discourse.nodered.org/t/maxmin-thermometer-reset/10772>\
**Category:** General\
**Created:** [3 May 2019 11:42 UTC](https://discourse.nodered.org/t/maxmin-thermometer-reset/10772 "2019-05-03T11:42:56Z")\
**Posts on this page:** 15\
**Page:** 1

<div class="post-metadata">

**Author:** ![Sean](https://avatars.discourse-cdn.com/v4/letter/s/f0a364/32.png) [@Sean](https://discourse.nodered.org/u/Sean)\
**Post date:** [3 May 2019 11:42 UTC](https://discourse.nodered.org/t/maxmin-thermometer-reset/10772/1 "2019-05-03T11:42:56Z")

</div>

Hi,  
Been trying to set up a max-min thermometer using node red (ESP32/DHT22/MQTT/RPi3(please bear with me, I'm new at this)).  
I need a reset button for the max and min gauges, so used a button to fire a function node setting msg.reset = 1 to reset the subsequent smooth node(s). the gauges (fed by the smooth nodes) reset to a value of 1 - fine for the max gauge which reset to current temp with next mqtt message, but min gauge will have to wait until temp falls below 1, presumably!  
So, why does the smooth node pass '1' instead of reinitialising and waiting for the next mqtt input?What did I miss, or is there a better way, please? Thank you for your forebearance, I hope that all made sense...

---

<div class="post-metadata">

**Author:** ![bakman2](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/bakman2/32/6207_2.png) [@bakman2](https://discourse.nodered.org/u/bakman2)\
**Post date:** [3 May 2019 11:58 UTC](https://discourse.nodered.org/t/maxmin-thermometer-reset/10772/2 "2019-05-03T11:58:19Z")

</div>

Post your flow so we can see what happens.

---

<div class="post-metadata">

**Author:** ![ukmoose](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/ukmoose/32/13_2.png) [@ukmoose](https://discourse.nodered.org/u/ukmoose)\
**Post date:** [3 May 2019 12:07 UTC](https://discourse.nodered.org/t/maxmin-thermometer-reset/10772/3 "2019-05-03T12:07:59Z")

</div>

In the message where you set `msg.reset=1` what have you got the `msg.payload` set to?

If you read the smooth nodes input panel it states

> If `msg.reset` is received (with any value), all the counters and intermediate values are reset to an initial state.

And the initial value is that set by the reset message.

This can be seen if you import the following flow and click on the injects from top to bottom  
`[{"id":"d56320da.a89e3","type":"inject","z":"50f1489e.628838","name":"","topic":"","payload":"1","payloadType":"num","repeat":"","crontab":"","once":false,"onceDelay":0.1,"x":122.5,"y":64,"wires":[["9b6faaff.fd9ff8"]]},{"id":"9b6faaff.fd9ff8","type":"smooth","z":"50f1489e.628838","name":"","property":"payload","action":"mean","count":"10","round":"","mult":"single","x":534.5,"y":194,"wires":[["9929c95.b146d38"]]},{"id":"9929c95.b146d38","type":"debug","z":"50f1489e.628838","name":"","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"false","x":694.5,"y":188,"wires":[]},{"id":"51614c7d.4e8a4c","type":"inject","z":"50f1489e.628838","name":"","topic":"","payload":"1000","payloadType":"num","repeat":"","crontab":"","once":false,"onceDelay":0.1,"x":121.5,"y":202,"wires":[["e061bc3.4439d4"]]},{"id":"e061bc3.4439d4","type":"change","z":"50f1489e.628838","name":"","rules":[{"t":"set","p":"reset","pt":"msg","to":"","tot":"str"}],"action":"","property":"","from":"","to":"","reg":false,"x":260.5,"y":200,"wires":[["9b6faaff.fd9ff8"]]},{"id":"8e29932b.9edde","type":"inject","z":"50f1489e.628838","name":"","topic":"","payload":"10","payloadType":"num","repeat":"","crontab":"","once":false,"onceDelay":0.1,"x":122,"y":110,"wires":[["9b6faaff.fd9ff8"]]},{"id":"efec260.dd73d58","type":"inject","z":"50f1489e.628838","name":"","topic":"","payload":"5.5","payloadType":"num","repeat":"","crontab":"","once":false,"onceDelay":0.1,"x":122,"y":150,"wires":[["9b6faaff.fd9ff8"]]},{"id":"272dd657.66f13a","type":"inject","z":"50f1489e.628838","name":"","topic":"","payload":"1","payloadType":"num","repeat":"","crontab":"","once":false,"onceDelay":0.1,"x":118,"y":261,"wires":[["9b6faaff.fd9ff8"]]},{"id":"8077b19f.307cc8","type":"inject","z":"50f1489e.628838","name":"","topic":"","payload":"10","payloadType":"num","repeat":"","crontab":"","once":false,"onceDelay":0.1,"x":118.5,"y":305,"wires":[["9b6faaff.fd9ff8"]]},{"id":"9122d633.be8c6","type":"inject","z":"50f1489e.628838","name":"","topic":"","payload":"2","payloadType":"num","repeat":"","crontab":"","once":false,"onceDelay":0.1,"x":118.5,"y":345,"wires":[["9b6faaff.fd9ff8"]]}]`

---

<div class="post-metadata">

**Author:** ![Sean](https://avatars.discourse-cdn.com/v4/letter/s/f0a364/32.png) [@Sean](https://discourse.nodered.org/u/Sean)\
**Post date:** [3 May 2019 12:24 UTC](https://discourse.nodered.org/t/maxmin-thermometer-reset/10772/4 "2019-05-03T12:24:04Z")

</div>

Sorry, here's my flow.  
ukmoose, I've not looked at yours yet - rushing about - but I understood the msg.reset function on smooth. However, the initial value doesn't seem to follow the value ascribed to msg.reset - I just tried it with msg.reset = 40; and the gauge returned 1.  
I will look at your flow as soon as I can, meanwhile, here's mine.  
Thank you much for your help...

````auto
[{"id":"f234654f.652a48","type":"tab","label":"Flow 1","disabled":false,"info":""},{"id":"48bdc589.059a2c","type":"debug","z":"f234654f.652a48","name":"","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"payload","targetType":"msg","x":970,"y":80,"wires":[]},{"id":"8389e5e8.a68428","type":"mqtt in","z":"f234654f.652a48","name":"Temperature","topic":"topic/temp1","qos":"2","datatype":"auto","broker":"91a70537.a84f08","x":290,"y":40,"wires":[["eef3a546.489468","b5e1f1b4.1b3c6","3f49bb03.3ff104","bba9cded.2fa2a"]]},{"id":"b0de5343.65e88","type":"mqtt in","z":"f234654f.652a48","name":"Humidity","topic":"topic/humid1","qos":"2","datatype":"auto","broker":"91a70537.a84f08","x":280,"y":100,"wires":[["d4f3ffbc.bc096","769696fb.5b7668","5f722a43.0e1d84","267a07f7.80e738"]]},{"id":"eef3a546.489468","type":"ui_chart","z":"f234654f.652a48","name":"Temperature","group":"3b204857.d75b68","order":1,"width":"13","height":"3","label":"Temperature","chartType":"line","legend":"false","xformat":"HH:mm:ss","interpolate":"linear","nodata":"","dot":false,"ymin":"","ymax":"","removeOlder":1,"removeOlderPoints":"","removeOlderUnit":"86400","cutout":0,"useOneColor":false,"colors":["#1f77b4","#aec7e8","#ff7f0e","#2ca02c","#98df8a","#d62728","#ff9896","#9467bd","#c5b0d5"],"useOldStyle":false,"outputs":1,"x":730,"y":40,"wires":[["48bdc589.059a2c"]]},{"id":"d4f3ffbc.bc096","type":"ui_chart","z":"f234654f.652a48","name":"Humidity","group":"3b204857.d75b68","order":3,"width":"13","height":"3","label":"Humidity","chartType":"line","legend":"false","xformat":"HH:mm:ss","interpolate":"linear","nodata":"","dot":false,"ymin":"","ymax":"","removeOlder":1,"removeOlderPoints":"","removeOlderUnit":"86400","cutout":0,"useOneColor":false,"colors":["#1f77b4","#aec7e8","#ff7f0e","#2ca02c","#98df8a","#d62728","#ff9896","#9467bd","#c5b0d5"],"useOldStyle":false,"outputs":1,"x":720,"y":100,"wires":[["48bdc589.059a2c"]]},{"id":"b5e1f1b4.1b3c6","type":"ui_gauge","z":"f234654f.652a48","name":"Temperature","group":"14bf30df.94ef3f","order":1,"width":"3","height":"3","gtype":"gage","title":"Current Temperature","label":"C","format":"{{value}}","min":"-15","max":"40","colors":["#00b500","#e6e600","#ca3838"],"seg1":"20","seg2":"25","x":730,"y":160,"wires":[]},{"id":"769696fb.5b7668","type":"ui_gauge","z":"f234654f.652a48","name":"Humidity","group":"14bf30df.94ef3f","order":6,"width":"3","height":"3","gtype":"wave","title":"Current Humidity","label":"%","format":"{{value}}","min":0,"max":"100","colors":["#00b500","#e6e600","#ca3838"],"seg1":"","seg2":"","x":720,"y":220,"wires":[]},{"id":"3f49bb03.3ff104","type":"smooth","z":"f234654f.652a48","name":"MaxTemp","property":"payload","action":"max","count":"1000","round":"","mult":"single","x":520,"y":280,"wires":[["33c3d37d.7f032c"]]},{"id":"33c3d37d.7f032c","type":"ui_gauge","z":"f234654f.652a48","name":"Max Temp","group":"14bf30df.94ef3f","order":3,"width":"3","height":"3","gtype":"gage","title":"Max.","label":"C","format":"{{value}}","min":"-15","max":"40","colors":["#00b500","#e6e600","#ca3838"],"seg1":"20","seg2":"25","x":730,"y":280,"wires":[]},{"id":"bba9cded.2fa2a","type":"smooth","z":"f234654f.652a48","name":"MinTemp","property":"payload","action":"min","count":"1000","round":"","mult":"single","x":520,"y":340,"wires":[["5673286f.5d3508"]]},{"id":"5673286f.5d3508","type":"ui_gauge","z":"f234654f.652a48","name":"Min Temp","group":"14bf30df.94ef3f","order":2,"width":"3","height":"3","gtype":"gage","title":"Min.","label":"C","format":"{{value}}","min":"-15","max":"40","colors":["#00b500","#e6e600","#ca3838"],"seg1":"20","seg2":"25","x":720,"y":340,"wires":[]},{"id":"5f722a43.0e1d84","type":"smooth","z":"f234654f.652a48","name":"MaxHum","property":"payload","action":"max","count":"1000","round":"","mult":"single","x":520,"y":400,"wires":[["e4068ef.82b337"]]},{"id":"267a07f7.80e738","type":"smooth","z":"f234654f.652a48","name":"MinHum","property":"payload","action":"min","count":"1000","round":"","mult":"single","x":520,"y":460,"wires":[["6f216a5c.8e1894"]]},{"id":"e4068ef.82b337","type":"ui_gauge","z":"f234654f.652a48","name":"Max Humidity","group":"14bf30df.94ef3f","order":8,"width":"3","height":"3","gtype":"wave","title":"Max.","label":"%","format":"{{value}}","min":0,"max":"100","colors":["#00b500","#e6e600","#ca3838"],"seg1":"","seg2":"","x":740,"y":400,"wires":[]},{"id":"6f216a5c.8e1894","type":"ui_gauge","z":"f234654f.652a48","name":"Min Humidity","group":"14bf30df.94ef3f","order":7,"width":"3","height":"3","gtype":"wave","title":"Min.","label":"%","format":"{{value}}","min":0,"max":"100","colors":["#00b500","#e6e600","#ca3838"],"seg1":"","seg2":"","x":730,"y":460,"wires":[]},{"id":"7a78c77c.23ad78","type":"ui_button","z":"f234654f.652a48","name":"","group":"14bf30df.94ef3f","order":4,"width":0,"height":0,"passthru":false,"label":"button","tooltip":"","color":"","bgcolor":"","icon":"","payload":"true","payloadType":"bool","topic":"","x":260,"y":260,"wires":[["8b8848d7.7e3e78"]]},{"id":"8b8848d7.7e3e78","type":"function","z":"f234654f.652a48","name":"msg.reset","func":"msg.reset = true;\nreturn msg;","outputs":1,"noerr":0,"x":310,"y":360,"wires":[["3f49bb03.3ff104","bba9cded.2fa2a"]]},{"id":"91a70537.a84f08","type":"mqtt-broker","z":"","name":"NodeRed","broker":"localhost","port":"1883","clientid":"","usetls":false,"compatmode":true,"keepalive":"60","cleansession":true,"birthTopic":"","birthQos":"0","birthPayload":"","closeTopic":"","closeQos":"0","closePayload":"","willTopic":"","willQos":"0","willPayload":""},{"id":"3b204857.d75b68","type":"ui_group","z":"","name":"Graphs","tab":"cd8f0bc5.bb8598","order":1,"disp":false,"width":"13","collapse":false},{"id":"14bf30df.94ef3f","type":"ui_group","z":"","name":"Gauges","tab":"cd8f0bc5.bb8598","order":2,"disp":false,"width":"9","collapse":false},{"id":"cd8f0bc5.bb8598","type":"ui_tab","z":"","name":"Greenhouse","icon":"fa-leaf","order":1,"disabled":false,"hidden":false}]```
````

---

<div class="post-metadata">

**Author:** ![ukmoose](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/ukmoose/32/13_2.png) [@ukmoose](https://discourse.nodered.org/u/ukmoose)\
**Post date:** [3 May 2019 12:33 UTC](https://discourse.nodered.org/t/maxmin-thermometer-reset/10772/5 "2019-05-03T12:33:20Z")

</div>

`msg.reset` can be set to anything, it just has to be present to trigger a reset  
the initial value is taken from `msg.payload` in the same message,

---

<div class="post-metadata">

**Author:** ![Sean](https://avatars.discourse-cdn.com/v4/letter/s/f0a364/32.png) [@Sean](https://discourse.nodered.org/u/Sean)\
**Post date:** [3 May 2019 15:03 UTC](https://discourse.nodered.org/t/maxmin-thermometer-reset/10772/6 "2019-05-03T15:03:04Z")

</div>

Nice! SO it turns out the "1" on the gauges was payload from the button output. I set the button output payload to "" and now when I push the button the gauges return 0 - not what I need, but progress...

---

<div class="post-metadata">

**Author:** ![Colin](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/colin/32/17040_2.png) [@Colin](https://discourse.nodered.org/u/Colin)\
**Post date:** [3 May 2019 15:37 UTC](https://discourse.nodered.org/t/maxmin-thermometer-reset/10772/7 "2019-05-03T15:37:48Z")

</div>

You might need to put a Change node in between, which is configured to Delete msg.payload.

---

<div class="post-metadata">

**Author:** ![Sean](https://avatars.discourse-cdn.com/v4/letter/s/f0a364/32.png) [@Sean](https://discourse.nodered.org/u/Sean)\
**Post date:** [3 May 2019 16:32 UTC](https://discourse.nodered.org/t/maxmin-thermometer-reset/10772/8 "2019-05-03T16:32:18Z")

</div>

Yep, that did it Colin - Change node with rules to both delete payload, and set msg.reset. It still takes until the next mqtt input for the gauges to change, but I can live with that for now. Thank you.

```auto
[{"id":"8389e5e8.a68428","type":"mqtt in","z":"f234654f.652a48","name":"Temperature","topic":"topic/temp1","qos":"2","datatype":"auto","broker":"91a70537.a84f08","x":290,"y":260,"wires":[["eef3a546.489468","b5e1f1b4.1b3c6","3f49bb03.3ff104","bba9cded.2fa2a","35304ba9.791c44"]]},{"id":"eef3a546.489468","type":"ui_chart","z":"f234654f.652a48","name":"Temperature","group":"3b204857.d75b68","order":1,"width":"13","height":"3","label":"Temperature","chartType":"line","legend":"false","xformat":"HH:mm:ss","interpolate":"linear","nodata":"","dot":false,"ymin":"","ymax":"","removeOlder":1,"removeOlderPoints":"","removeOlderUnit":"86400","cutout":0,"useOneColor":false,"colors":["#1f77b4","#aec7e8","#ff7f0e","#2ca02c","#98df8a","#d62728","#ff9896","#9467bd","#c5b0d5"],"useOldStyle":false,"outputs":1,"x":650,"y":220,"wires":[[]]},{"id":"b5e1f1b4.1b3c6","type":"ui_gauge","z":"f234654f.652a48","name":"Temperature","group":"14bf30df.94ef3f","order":1,"width":"3","height":"3","gtype":"gage","title":"Current Temperature","label":"C","format":"{{value}}","min":"-15","max":"40","colors":["#093bf4","#e6e600","#ca3838"],"seg1":"","seg2":"","x":650,"y":280,"wires":[]},{"id":"3f49bb03.3ff104","type":"smooth","z":"f234654f.652a48","name":"MaxTemp","property":"payload","action":"max","count":"1000","round":"","mult":"single","x":860,"y":200,"wires":[["33c3d37d.7f032c"]]},{"id":"33c3d37d.7f032c","type":"ui_gauge","z":"f234654f.652a48","name":"Max Temp","group":"14bf30df.94ef3f","order":3,"width":"3","height":"3","gtype":"gage","title":"Max.","label":"C","format":"{{value}}","min":"-15","max":"40","colors":["#093bf4","#e6e600","#ca3838"],"seg1":"","seg2":"","x":1070,"y":200,"wires":[]},{"id":"bba9cded.2fa2a","type":"smooth","z":"f234654f.652a48","name":"MinTemp","property":"payload","action":"min","count":"1000","round":"","mult":"single","x":860,"y":260,"wires":[["5673286f.5d3508"]]},{"id":"5673286f.5d3508","type":"ui_gauge","z":"f234654f.652a48","name":"Min Temp","group":"14bf30df.94ef3f","order":2,"width":"3","height":"3","gtype":"gage","title":"Min.","label":"C","format":"{{value}}","min":"-15","max":"40","colors":["#093bf4","#e6e600","#ca3838"],"seg1":"","seg2":"","x":1060,"y":260,"wires":[]},{"id":"931affd8.7b7e","type":"ui_button","z":"f234654f.652a48","name":"","group":"14bf30df.94ef3f","order":4,"width":0,"height":0,"passthru":false,"label":"Temp. Reset","tooltip":"","color":"","bgcolor":"","icon":"","payload":"true","payloadType":"bool","topic":"","x":450,"y":160,"wires":[["938aecb6.69984"]]},{"id":"938aecb6.69984","type":"change","z":"f234654f.652a48","name":"Reset MaxMin","rules":[{"t":"set","p":"reset","pt":"msg","to":"true","tot":"bool"},{"t":"delete","p":"payload","pt":"msg"}],"action":"","property":"","from":"","to":"","reg":false,"x":640,"y":160,"wires":[["3f49bb03.3ff104","bba9cded.2fa2a"]]},{"id":"91a70537.a84f08","type":"mqtt-broker","z":"","name":"NodeRed","broker":"localhost","port":"1883","clientid":"","usetls":false,"compatmode":true,"keepalive":"60","cleansession":true,"birthTopic":"","birthQos":"0","birthPayload":"","closeTopic":"","closeQos":"0","closePayload":"","willTopic":"","willQos":"0","willPayload":""},{"id":"3b204857.d75b68","type":"ui_group","z":"","name":"Graphs","tab":"cd8f0bc5.bb8598","order":1,"disp":false,"width":"13","collapse":false},{"id":"14bf30df.94ef3f","type":"ui_group","z":"","name":"Gauges","tab":"cd8f0bc5.bb8598","order":2,"disp":false,"width":"9","collapse":false},{"id":"cd8f0bc5.bb8598","type":"ui_tab","z":"","name":"Greenhouse","icon":"fa-leaf","order":1,"disabled":false,"hidden":false}]

```

---

<div class="post-metadata">

**Author:** ![Colin](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/colin/32/17040_2.png) [@Colin](https://discourse.nodered.org/u/Colin)\
**Post date:** [3 May 2019 21:04 UTC](https://discourse.nodered.org/t/maxmin-thermometer-reset/10772/9 "2019-05-03T21:04:20Z")

</div>

They can't change immediately because they don't know what to change to till you give them a value.

---

<div class="post-metadata">

**Author:** ![Sean](https://avatars.discourse-cdn.com/v4/letter/s/f0a364/32.png) [@Sean](https://discourse.nodered.org/u/Sean)\
**Post date:** [3 May 2019 22:22 UTC](https://discourse.nodered.org/t/maxmin-thermometer-reset/10772/10 "2019-05-03T22:22:13Z")

</div>

yep, I get that. Now I need to work out a way to 'prime' either the Smooth nodes or the Gauges directly on the button-press. No hurry - I have other stuff to work out first. Thanks for your help.

---

<div class="post-metadata">

**Author:** ![Colin](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/colin/32/17040_2.png) [@Colin](https://discourse.nodered.org/u/Colin)\
**Post date:** [4 May 2019 08:45 UTC](https://discourse.nodered.org/t/maxmin-thermometer-reset/10772/11 "2019-05-04T08:45:19Z")

</div>

If you know what you want to prime with then , in the Change node, instead of deleting msg.payload just set it to whatever you want.

---

<div class="post-metadata">

**Author:** ![Sean](https://avatars.discourse-cdn.com/v4/letter/s/f0a364/32.png) [@Sean](https://discourse.nodered.org/u/Sean)\
**Post date:** [4 May 2019 12:04 UTC](https://discourse.nodered.org/t/maxmin-thermometer-reset/10772/12 "2019-05-04T12:04:38Z")

</div>

Yeah - they need to show the latest measurement, and I'm only sampling once a minute. I need to record and refresh each sample so the Change node can inject it if the button is pressed - I'm sure it's trivial, but a)I'm a newbie toNodeRed, Java and JSON, and b) I haven't even looked at it yet. I'll get around to it...🤣

---

<div class="post-metadata">

**Author:** ![myozone](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/myozone/32/8904_2.png) [@myozone](https://discourse.nodered.org/u/myozone)\
**Post date:** [15 November 2019 09:49 UTC](https://discourse.nodered.org/t/maxmin-thermometer-reset/10772/13 "2019-11-15T09:49:16Z")

</div>

I'm having a similar issue, how do I reset the min,max at say 09:00 ?

---

<div class="post-metadata">

**Author:** ![Colin](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/colin/32/17040_2.png) [@Colin](https://discourse.nodered.org/u/Colin)\
**Post date:** [15 November 2019 11:05 UTC](https://discourse.nodered.org/t/maxmin-thermometer-reset/10772/14 "2019-11-15T11:05:21Z")

</div>

You can use an inject node set for 09:00 to send the message, or you can use one of the timer nodes if you need a more complex schedule. Possibly one of the contrib nodes bigtimer, schedex or cron-plus.

---

<div class="post-metadata">

**Author:** ![myozone](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/myozone/32/8904_2.png) [@myozone](https://discourse.nodered.org/u/myozone)\
**Post date:** [15 November 2019 11:53 UTC](https://discourse.nodered.org/t/maxmin-thermometer-reset/10772/15 "2019-11-15T11:53:27Z")

</div>

Thanks for the suggestions, this is what I ended up with - messy but it works !. The top delay node goes off to email.

```auto
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```