Display temperature over network

[sdetweil]

@linuxdxs how transmit over network?

[linuxdxs]

So far I have no idea how to transfer the data. Maybe over udp and phyton?

[sdetweil]

@linuxdxs what is running on the pi 0?.. raspian and python?

you could set up a little web server (using node js and express, or python) and then a module on the Magic Mirror could call that server to get the data

[linuxdxs]

Ok, which webserver would you prefere

[sdetweil]

@linuxdxs you can write code to start the web server… node web server using express library is very short…
I don’t know python that well… I’m sure a google search will give u results…

so, whatever u feel more comfortable with

once u set that up you can use your browser to invoke the function on the pi0 to return the temp…

once that is working, then u can build a module to do the same…
using my sample module might help on the last step

https://github.com/sdetweil/SampleModule

[ember1205]

Why not write the module that goes into MM and then use a script on the thermometer to update the module when the temp changes? If your thermometer is measuring the internal temp of a home, and that changes infrequently because the heat or AC is on, there’s no point in polling the thermometer every five minutes to see what the temp is. :)

[sdetweil]

@ember1205 thats another way, but takes more skill to trigger into MM…

[ember1205]

@sdetweil Agreed. And, it would still require a method for the module to “register” with the remote thermometer of its existence when it loads so that initial temp and updates will be transmitted.

[sdetweil]

@ember1205 based on @linuxdxs comments and questions, I think starting slow is a better choice…

[stampeder]

If you are using the Raspberry Pi Zero W’s they come with wifi built in. I just finished getting the MMM-temp-DS18B20 module issue fixed and working. The next thing would be to use MMM-MQTT. This will allow you to have a broker that will collect all the readings and store them in a set of topics. Then you just need the MMM-MQTT-client to read the topics and display the readings. It sounds way more complicated than it really is. I recently wrote a blog posting on http://www.desert-home.com/ called http://www.desert-home.com/2020/02/temperature-adventures-with-rasppi.html. It explains a lot of it. Then you just need to setup the MQTT-clients to read the temperatures. Good luck. Should be a fun project.

[PILuke]

@linuxdxs you can use this simple module MMM-RemoteTemperature and from your termometer you only send an HTTP POST request.
You choose the udate interval and all the MM, with this module, will update their value when you send the HTTP POST.
I hope this help you.

[davidoesch]

@PILuke yep

Had the same challenge

3 DHT sensors on 2 different PIs

solution

on the PI’s I have a cron job wich runs a python program to extract temperature and send it via REST to a MMM-remote temperature

pseudo code json to send

            data = {'temp': round(temperature, 1),
                    'humidity': round(humidity, 0),
                    'sensorId': str(SensorID)}
            post_request(json.dumps(data), 'http://192.168.x.x:8080/remote-temperature', {'Content-type': 'application/json', 'Accept': 'text/plain'})

installed MMM-RemoteTemperature, 3 ids

			module: 'MMM-RemoteTemperature',
			position: 'bottom_center',
			config: {
				sensorId: '1',
				icon: 'home',
				showTime: false
			}
		},
		{
			module: 'MMM-RemoteTemperature',
			position: 'bottom_center',
			config: {
				sensorId: '2',
				icon: 'couch',
				showTime: false
			}
		},
				{
			module: 'MMM-RemoteTemperature',
			position: 'bottom_center',
			config: {
				sensorId: '3',
				icon: 'map-marker-alt',
				showTime: false
			}
		},

cheers

[lavolp3]

EDIT: Sorry, didn’t read everything.
tl;dr: what @stampeder said…

@linuxdxs I personally would use MQTT for that purpose. It’s a very lightweight way of regularly publishing data through your network and fetching it with any device you want to. It’s also cross platform. You could use your android mobile as well.

I use MQTT to fetch data from and send controls to my tasmota plugs and it works very well.
There’s a module called MMM-MQTT-Bridge already published that could be used and my soon-to-be-published MMM-Tasmota would work as well as a basis.
On the Raspi’s you would need an MQTT server like mosquitto.
May not sound like the easiest way but on the publisher side it’s not more than a few lines of code.