# First flow on all my RPIs

**URL:** <https://discourse.nodered.org/t/first-flow-on-all-my-rpis/88878>\
**Category:** Share Your Projects\
**Created:** [23 June 2024 12:31 UTC](https://discourse.nodered.org/t/first-flow-on-all-my-rpis/88878 "2024-06-23T12:31:10Z")\
**Posts on this page:** 6\
**Page:** 2

<div class="post-metadata">

**Author:** ![juntiedt](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/juntiedt/32/58357_2.png) [@juntiedt](https://discourse.nodered.org/u/juntiedt)\
**Post date:** [17 February 2025 15:21 UTC](https://discourse.nodered.org/t/first-flow-on-all-my-rpis/88878/21 "2025-02-17T15:21:14Z")

</div>

another update:  
I added sunrise and sunset as well as day and night duration.  
The data is stored in global variables at 2 min past midnight  
If you are going to use it don't forget to change the coordinates in CronPlus

```auto
[{"id":"6d124ca2da58ee9f","type":"group","z":"5d5731ac89f86d92","name":"sunrise-sunset-day-night","style":{"label":true,"fill":"#ffefbf","fill-opacity":"0.18"},"nodes":["ddc204b9b74b46ab","87cd74d6b567985e","ecbdde3890befc33","846b05c9700bf24b","490e7c5b1133637b","a23687c1594a4c34","f44f87a774ff5190","b05d8fc1eba5f1aa","19c90b73105bc945","309f9dc9691ecaba","8e8a6a45d83c3474","7f6c8e7146fbc56e","6fbdf85639ef4f85"],"x":74,"y":1539,"w":1642,"h":162},{"id":"ddc204b9b74b46ab","type":"inject","z":"5d5731ac89f86d92","g":"6d124ca2da58ee9f","name":"at 00:02","props":[{"p":"payload"}],"repeat":"","crontab":"01 00 * * *","once":true,"onceDelay":"5","topic":"","payload":"","payloadType":"date","x":180,"y":1620,"wires":[["87cd74d6b567985e"]]},{"id":"87cd74d6b567985e","type":"function","z":"5d5731ac89f86d92","g":"6d124ca2da58ee9f","name":"solarEvents","func":"msg.payload = {\"command\":\"describe\",\n \"location\":\"48.38157356491496 10.437845885753632\",\n \"timeZone\":\"Europe/Berlin\",\n \"expressionType\":\"solar\",\n \"solarType\":\"selected\",\n \"solarEvents\":\"sunrise,sunset\"\n };\nreturn msg;","outputs":1,"timeout":"","noerr":0,"initialize":"","finalize":"","libs":[],"x":330,"y":1620,"wires":[["846b05c9700bf24b"]]},{"id":"ecbdde3890befc33","type":"switch","z":"5d5731ac89f86d92","g":"6d124ca2da58ee9f","name":"","property":"payload.command.command","propertyType":"msg","rules":[{"t":"eq","v":"describe","vt":"str"},{"t":"eq","v":"status-all","vt":"str"}],"checkall":"true","repair":false,"outputs":2,"x":710,"y":1620,"wires":[["490e7c5b1133637b"],[]]},{"id":"846b05c9700bf24b","type":"cronplus","z":"5d5731ac89f86d92","g":"6d124ca2da58ee9f","name":"sunrise-sunset-day-night","outputField":"payload","timeZone":"","storeName":"","commandResponseMsgOutput":"output1","defaultLocation":"48.38157356491496 10.437845885753632","defaultLocationType":"default","outputs":1,"options":[],"x":530,"y":1620,"wires":[["ecbdde3890befc33"]]},{"id":"490e7c5b1133637b","type":"function","z":"5d5731ac89f86d92","g":"6d124ca2da58ee9f","name":"get sr + ss items","func":"\nvar sunrise = msg.payload.result.eventTimes.find(e => {\n return e.event == \"sunrise\"\n})\n\nvar sunset = msg.payload.result.eventTimes.find(e => {\n return e.event == \"sunset\"\n})\n\nmsg.payload = {\n sunrise : sunrise.time,\n sunset : sunset.time\n}\nreturn msg;","outputs":1,"timeout":"","noerr":0,"initialize":"","finalize":"","libs":[],"x":860,"y":1620,"wires":[["a23687c1594a4c34","b05d8fc1eba5f1aa","19c90b73105bc945"]]},{"id":"a23687c1594a4c34","type":"change","z":"5d5731ac89f86d92","g":"6d124ca2da58ee9f","name":"sunrise-sunset difference","rules":[{"t":"set","p":"payload","pt":"msg","to":" $moment($$.payload.sunset).diff($moment($$.payload.sunrise), \"seconds\")","tot":"jsonata"}],"action":"","property":"","from":"","to":"","reg":false,"x":1130,"y":1660,"wires":[["f44f87a774ff5190"]]},{"id":"f44f87a774ff5190","type":"function","z":"5d5731ac89f86d92","g":"6d124ca2da58ee9f","name":"day & night duration","func":"const day = 60*60*24;\nlet tag = msg.payload;\nlet nacht = day - tag;\nlet nacht_total = duration_str(nacht);\nlet tag_total = duration_str(tag);\n//msg.payload = \"Tag: \" + tag_total + \" / \" + \"Nacht: \" + nacht_total;\nglobal.set('day', tag_total );\nglobal.set('night', nacht_total);\nreturn {payload: Date.now()};\n\n//------------------------------------------------------------------\n\nfunction duration_str(sec) {\n const t = sec;\n const h = (Math.floor(t / 3600)).toString();\n const m = (Math.floor(t % 3600 / 60)).toString();\n// let s = (Math.floor(t % 3600 % 60)).toString();\n// let r = h + \":\" + (\"0\" + m).slice(-2) + \":\" + (\"0\" + s).slice(-2);\n return (h + \":\" + (\"0\" + m).slice(-2));\n}\n\n//------------------------------------------------------------------","outputs":1,"timeout":"","noerr":0,"initialize":"","finalize":"","libs":[],"x":1360,"y":1660,"wires":[["309f9dc9691ecaba"]]},{"id":"b05d8fc1eba5f1aa","type":"function","z":"5d5731ac89f86d92","g":"6d124ca2da58ee9f","name":"sunrise","func":"let sunrise = date_time_string(msg.payload.sunrise);\nglobal.set('sunrise', sunrise);\nreturn{payload:msg.payload.sunrise}\n\nfunction date_time_string(t) {\n const date = new Date(t);\n const day = date.getDate().toString().padStart(2, '0');\n const month = (date.getMonth() + 1).toString().padStart(2, '0');\n const year = date.getFullYear().toString();\n const hours = date.getHours().toString().padStart(2, '0');\n const minutes = date.getMinutes().toString().padStart(2, '0');\n const seconds = date.getSeconds().toString().padStart(2, '0');\n return `${hours}:${minutes}`;\n}","outputs":1,"timeout":0,"noerr":0,"initialize":"","finalize":"","libs":[],"x":1080,"y":1580,"wires":[["7f6c8e7146fbc56e"]]},{"id":"19c90b73105bc945","type":"function","z":"5d5731ac89f86d92","g":"6d124ca2da58ee9f","name":"sunset","func":"let sunset = date_time_string(msg.payload.sunset);\nglobal.set('sunset', sunset);\nreturn{payload:msg.payload.sunset};\n\nfunction date_time_string(t) {\n const date = new Date(t);\n const day = date.getDate().toString().padStart(2, '0');\n const month = (date.getMonth() + 1).toString().padStart(2, '0');\n const year = date.getFullYear().toString();\n const hours = date.getHours().toString().padStart(2, '0');\n const minutes = date.getMinutes().toString().padStart(2, '0');\n const seconds = date.getSeconds().toString().padStart(2, '0');\n return `${hours}:${minutes}`;\n}","outputs":1,"timeout":0,"noerr":0,"initialize":"","finalize":"","libs":[],"x":1070,"y":1620,"wires":[["6fbdf85639ef4f85"]]},{"id":"309f9dc9691ecaba","type":"delay","z":"5d5731ac89f86d92","g":"6d124ca2da58ee9f","name":"","pauseType":"delay","timeout":"5","timeoutUnits":"seconds","rate":"1","nbRateUnits":"1","rateUnits":"second","randomFirst":"1","randomLast":"5","randomUnits":"seconds","drop":false,"allowrate":false,"outputs":1,"x":1560,"y":1660,"wires":[["8e8a6a45d83c3474"]]},{"id":"8e8a6a45d83c3474","type":"link out","z":"5d5731ac89f86d92","g":"6d124ca2da58ee9f","name":"sun-data-out","mode":"link","links":["950da9e6221c062b"],"x":1675,"y":1660,"wires":[]},{"id":"7f6c8e7146fbc56e","type":"link out","z":"5d5731ac89f86d92","g":"6d124ca2da58ee9f","name":"sunrise-out","mode":"link","links":[],"x":1175,"y":1580,"wires":[]},{"id":"6fbdf85639ef4f85","type":"link out","z":"5d5731ac89f86d92","g":"6d124ca2da58ee9f","name":"sunset-out","mode":"link","links":[],"x":1175,"y":1620,"wires":[]}]

```

---

<div class="post-metadata">

**Author:** ![juntiedt](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/juntiedt/32/58357_2.png) [@juntiedt](https://discourse.nodered.org/u/juntiedt)\
**Post date:** [30 December 2025 10:40 UTC](https://discourse.nodered.org/t/first-flow-on-all-my-rpis/88878/22 "2025-12-30T10:40:48Z")

</div>

I found a better way to read the temperature of an RPI.  
It does not use an exec-node which means no extra process to start  
 ![image](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/9/0/90eb49e39fcdf424d4c0e7d5ae40de2476a9cb9d.png)

```auto
[{"id":"315e79e764cc2acc","type":"file in","z":"2fa67f563face78f","g":"11cf27f032a07d3c","name":"temp","filename":"/sys/class/thermal/thermal_zone0/temp","filenameType":"str","format":"utf8","chunk":false,"sendError":false,"encoding":"none","allProps":false,"x":330,"y":2520,"wires":[["d92dde09b7d986bd"]]},{"id":"b51971924d6309ed","type":"inject","z":"2fa67f563face78f","g":"11cf27f032a07d3c","name":"jede Minute","props":[{"p":"payload"}],"repeat":"60","crontab":"","once":true,"onceDelay":"5","topic":"","payload":"","payloadType":"date","x":190,"y":2520,"wires":[["315e79e764cc2acc"]]},{"id":"d92dde09b7d986bd","type":"function","z":"2fa67f563face78f","g":"11cf27f032a07d3c","name":"function 66","func":"let temp = parseInt(msg.payload) / 1000;\nstatus(temp);\nreturn null;\n\nfunction status(data){\n let time = new Date(Date.now()).toLocaleTimeString('de-DE');\n node.status({ fill: \"green\", shape: \"dot\", text: (time + \" | \" + data + \"°C\") }); \n}","outputs":1,"timeout":0,"noerr":0,"initialize":"","finalize":"","libs":[],"x":470,"y":2520,"wires":[[]]}]

```

---

<div class="post-metadata">

**Author:** ![zenofmud](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/zenofmud/32/316_2.png) [@zenofmud](https://discourse.nodered.org/u/zenofmud)\
**Post date:** [30 December 2025 14:13 UTC](https://discourse.nodered.org/t/first-flow-on-all-my-rpis/88878/23 "2025-12-30T14:13:52Z")

</div>

You could also use this node:

> **[@ralphwetzel/node-red-systeminformation](https://flows.nodered.org/node/@ralphwetzel/node-red-systeminformation)**
>
> Node-RED interface to systeminformation, the System Information Library for Node.JS

It offers lots of information.

---

<div class="post-metadata">

**Author:** ![juntiedt](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/juntiedt/32/58357_2.png) [@juntiedt](https://discourse.nodered.org/u/juntiedt)\
**Post date:** [30 December 2025 22:01 UTC](https://discourse.nodered.org/t/first-flow-on-all-my-rpis/88878/24 "2025-12-30T22:01:56Z")

</div>

It looks great but this is overkill for what I wanted to achieve in my first flow..

It is just a file read to get the temp. Very light and efficient small code.

---

<div class="post-metadata">

**Author:** ![zenofmud](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/zenofmud/32/316_2.png) [@zenofmud](https://discourse.nodered.org/u/zenofmud)\
**Post date:** [31 December 2025 12:18 UTC](https://discourse.nodered.org/t/first-flow-on-all-my-rpis/88878/25 "2025-12-31T12:18:32Z")

</div>

You can tell the node which items you want to get. So if you only want temperature you can get it. Here is an example:

```auto
[{"id":"4b03b0a59a8e4025","type":"debug","z":"67bc9adc42873b77","name":"debug 1","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"payload","targetType":"msg","statusVal":"","statusType":"auto","x":560,"y":100,"wires":[]}]

```

The node gives you options to get other information without having to write the code in a function node.

But you can choose to do it any way you want. Happy New Year!

---

<div class="post-metadata">

**Author:** ![juntiedt](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/juntiedt/32/58357_2.png) [@juntiedt](https://discourse.nodered.org/u/juntiedt)\
**Post date:** [31 December 2025 12:38 UTC](https://discourse.nodered.org/t/first-flow-on-all-my-rpis/88878/26 "2025-12-31T12:38:11Z")

</div>

Started as a small project [...], it now has \> 15,000 lines of code, \> 600 versions published, up to 8 mio downloads per month, \> 220 mio downloads overall. **#1 NPM ranking for backend packages**.

I don't need 15000 lines of code to get the temperature. 😉

I wish you a happy new year as well and let's stay in touch in this awesome forum.

Hannes

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