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Display temperature over network



  • 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.



  • @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.



  • @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


  • Moderator

    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.