I have, just like many of us, several RPi's scattered around. Some are placed outdoor, indoor, in the ground and up in the attic. In total I counted to 10, crazy, really tried to re-think, well some got eventually be merged but I need at least 8. So, decided to keep it as is. I really wanted to check if they all are working in an acceptable environment. Up here in the North the seasonal conditions can vary a bit, from cold winter to hot summer, especially in our attic So I decided to throw some simple stuff together. In each RPi I have this little minimalistic flow (in addition to all the many other flows), reporting the CPU temperature every minute via MQTT. Please note, for each RPi I set a unique topic (basically the RPi name or main function) [image] [{"id":"cc61ba3e.287248","type":"inject","z":"9d2e48e4.b9a108","name":"","topic":"","payload":"true","payloadType":"bool","repeat":"60","crontab":"","once":true,"onceDelay":0.1,"x":130,"y":80,"wires":[["fd25ffe9.ce945"]]},{"id":"fd25ffe9.ce945","type":"exec","z":"9d2e48e4.b9a108","command":"vcgencmd","addpay":false,"append":"measure_temp","useSpawn":"false","timer":"","oldrc":false,"name":"","x":390,"y":80,"wires":[["d4ad47cb.fd87b8"],[],[]]},{"id":"d4ad47cb.fd87b8","type":"change","z":"9d2e48e4.b9a108","name":"","rules":[{"t":"set","p":"topic","pt":"msg","to":"pitemp/video","tot":"str"}],"action":"","property":"","from":"","to":"","reg":false,"x":680,"y":80,"wires":[["846ef75c.484818"]]},{"id":"846ef75c.484818","type":"mqtt out","z":"9d2e48e4.b9a108","name":"","topic":"","qos":"","retain":"","broker":"3e8f923b.c168be","x":940,"y":80,"wires":[]},{"id":"d1207303.f6b73","type":"comment","z":"9d2e48e4.b9a108","name":"CPU Temperature","info":"","x":170,"y":40,"wires":[]},{"id":"3e8f923b.c168be","type":"mqtt-broker","z":"","name":"","broker":"192.168.0.240","port":"1883","clientid":"","usetls":false,"compatmode":true,"keepalive":"60","cleansession":true,"birthTopic":"","birthQos":"0","birthPayload":"","closeTopic":"","closePayload":"","willTopic":"","willQos":"0","willPayload":""}] Next is to collect & present all those MQTT messages. I decided to make a simple GUI view using the dashboard. It will definitely not win a beauty contest but it serves it's purpose. Please note you have to edit the switch node fitting the topic names you used earlier in each RPi This is how it looks like when monitoring my 10 RPi's [image] This is the flow: [image] [{"id":"6858b37c.01ff9c","type":"mqtt 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Just an idea, if you want to reduce cost and overkill, you could try using arduino's instead of RPi's when you just need to turn something on/off. I use a central RPi and several arduino nano's around the house. They talk using MQTT. You can get wifi or ethernet shields - I think there are some arduino's with the wifi built-in. I feel like this setup is also easier to maintain code-wise.

Or an even cheaper solution is the Wemos D1 Mini (ESP8266 based microcontroller) with built-in WiFi. It talks via MQTT to Node-RED really easily (if flashed with ESP Easy or Tasmota).

how do you power those if you have many of them at different locations?

[image] alphaOri: Just an idea, if you want to reduce cost and overkill you could try using arduino's instead of RPi's when you just need to turn something on/off. I use a central RPi and several arduino nano's around the house. They talk using MQTT. You can get wifi or ethernet shields - I think there are some arduino's with the wifi built-in. I feel like this setup is also easier to maintain code-wise. I've got plenty of PiZero (most are $5 originals with a WiFi dongle hacked onto them) [image] I do use a couple of Wemos D1 minis as well to just receive MQTT generated by the Pi computers I generally use the Pi for when I want a bit more than just switching stuff on or off I find it MUCH easier to maintain, understand and change Node-RED code than Arduino C++ stuff :slight_smile:

That's a good point about getting power to the arduino's - although you'll have the same problem with the RPi's. In a couple instances, I've had to pull wire and install another outlet (i.e. for a sensor in the attic, water monitor in the crawspace, or temp/humidity sensor over my porch), but I understand that's inconvenient or dangerous for DIY...

Wow, that's a great deal. I see wifi zero's are $15 now but still that beats a nano with wifi shield. Having said that, I still love a chance to do some C coding - something about programming a microcontroller in C is awesome fun... I used to be a PIC guy till arduino spoiled me :slight_smile:

@edje11 : Is your RPi monitoring system available?

Well, after thinking about it... I have decided to retire as much of my python scripting as possible over time, as I move things into node-red. Ignore the grown man crying behind the curtain... All the python I have was a real time investment... oh well. LOL.

I've just this minute (OK about 15mins) installed Node Red onto my Pi zero W. Just got to think of some uses for it now. Probably ideal for experimenting away from my production version.

I use a pizerow as my mqtt broker and in no I have it checking on my Wemos’s telling me who’s alive and what version of espeasy is installed on them

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RPi CPU Temperature monitoring - simple but informative

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Bobo 26 June 2020 04:25 30

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RPi CPU Temperature monitoring - simple but informative

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