Hello,
I am totally new in raspberry pi programming and I started with a node-red project for measure temperature and humidity (Temperature 3 - 20 °C, humidity 80-100%).
The measurement is going to be in a refigerator with high humidty so I wan't as less components as possible in there.
I did find a node for the DHT11 (22) sensor and this is already working.
Since I want to check if the BME680 sensor is more fitting for my project I want to connect both and compare the results in a database.
I am looking now for the easiest way to get temperature and humidity reading from the BME680.
Can anybody help me to archive this?
Hey, you can check this topic from while ago.
Best solution would be to use an external module like a d1 mini for example and connect it to bme680. Values can be send via mqtt to you Rpi and nodered.
I think the easiest way would be to use d1 mini, BME and EspEasy on the module
Hey thanks for the fast response.
I already read this topic, but i was actually searching for a simple solution without using more parts then the pi and the sensor.
Since there is a way to read the data with a python script (at least I read something like this) I thought it might be possible to get a simple solution without installing more parts (measurement will be at high humidity and i don't want to build in more parts like i really need).
I really think its better to sacrifice a few dollar module than the Rpi.
A solution is probably there but its not easy as you might expect.
And when you discover mqtt everything goes to new level!.
You also didnt tell how would you display the values?
Yeah i am afraid that you are right.
But at least I want to check if anybody knows a different solution.
I already made a dashboard in node red vor the visualisation and i store the data in an influx db. The stored data is shown in graphs via grafana.
I concur with @user7 - something like a d1 mini is fantastic for this stuff, hook the sensor up, flash tasmota on it and it's automatically detected and all values can be send over mqtt. Have it up and running in 5 minutes (most work is probably the soldering part)
OK, probably somebody has a different solution, but I am defently checking the d1 option.
Would it be possible to connect both sensors to the d1 mini?
If so I could make a "sensor box" with the DHT22, the BME680 and the d1 mini.
Then i would only need one cable for the powersupply of the d1.
Is it possible to use the d1 without wifi but cable connection to the raspberry pi?
The whole point of using a Wemos D1 Mini or equivalent is you can position it/them at a remote place.
i.e. They are acting as a remote slave (that communicates to the RPi via MQTT protocol).
You just use your RPi as a server running Node-RED and MQTT.
As @bakman2 said... quite a few people on this forum use Wemos D1 Minis to create "systems".
Take a look at one of my student's current project... (as it might give you some ideas).
I don't want a remote connection for this application (only if i have to make one).
That's why I am looking for a solution without the D1 Mini.
The measurement is going to be in a refigerator with high humidty so I wan't as less components as possible in there.
I want to read the data from the BME680 directly from the pi with node red.
But it seems that this is quite difficult, thats why I am checking the D1 option.
It would have been helpful if you had said the sensor would be inside a refrigerator at the start of your post.
I have no idea what is the maximum length of an I2C cable you can use and still get reliable readings.
I've not tried to use anything longer than 10 cms.
Maybe other people on the forum can offer suggestions for you.
The BME-280 might be suitable (and it is inexpensive).
-40 to +85 deg C and 0 to 100% humidity.
If you can tolerate the shipping delay, Banggood and Ali-Express are worth checking out.
I would still consider using a Wemos D1 Mini placed outside the fridge and somehow get the I2C cable from the inside to the outside. All you would need to power the D1 is a 5V mobile phone charger.
You could draw some nice looking graphs on the NR-dashboard as well as saving the readings to a database.
Do you really need the humidity? If it were just temperature you could use an DS18B20 which can easily be directly connected to a Pi zero. Though even with that sensor then personally I would use a D1 Mini connected by wifi and using MQTT to communicate with my node red system (which is a Pi). With the Mini you don't need to worry about power failure wrecking the SD card.
There's also the waterproof version of the DS18B20 (with a 100 cms long lead).
My student is planning to make use of this component in version-2 of his Weather Station.
Yes that could be an option.
I can try that, the distance will be approx. 2 meters.
Then the pi and de D1 are right next to each other...but who cares...^^
Just weird, that there is no solution with direct connection.
Yes I already did that, working with influx db and grafana (visualisation and adjustments with node red dashboard).
There are, using other devices such as an Arduino, but the D1 Mini is so cheap and so easy to use (particularly PSU requirements) that it is easier to go that way. In fact I think you can power the mini from a USB socket on the Pi and pretty sure you can use the wired comms channel instead of the wifi but not certain of that.
Are you just monitoring or using it to control the fridge too?
You can use the DS18B20W on a long wire since they are 1-wire devices and attach them to a Pi. I build a string of them to measure the temperature in 5 rooms on the third floor of our church all connected to one with. The wire (I used cat-5 cable) was about 20 feet (6 meters) long.
