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opendata-stuttgart / sensors-software

sourcecode for reading sensor data
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Recommended Sensors #171

Open svenkubiak opened 6 years ago

svenkubiak commented 6 years ago

Hi,

I have seen that in the latest software release (NRZ-2017-099) a lot of sensor have been added.

SDS011 PMS1003, PMS5003, PMS6003, PMS7003 PMS3003 DHT22 HTU21D PPD42NS BMP180 BMP280 BME280 DS18B20 GPS (NEO 6M)

Is there a list of functionalities and advantages on all of those sensors? Is there a recommended list of sensor to use for air quality, temperature, air pressure and humidity?

Thank you and best regards, Sven

P.S.: Please let me know if this is the wrong place to ask a question like this.

Adorfer commented 6 years ago

we can start with the deprecated ones like PMS1003, PMS3003 due to dust accumulation issues. Pms5003 for having an easy soldering cable, but beeing bulky. PPD42NS for beeing outdated, BMP280 for missing values compared to BME280.

svenkubiak commented 6 years ago

@Adorfer Thanks for the heads up.

I currently have a SDS011 and a DHT22 in use and would like to have air pressure as well. Based on your infos I am thinking about an BME280 to have one sensor for temp, pressure and humidity. And as I am working on the station anyway, would it make sense to also update the air quality sensor to a PMS7003?

dokape commented 6 years ago

Standard Setup is actual: SDS011 and DHT22 (easy to wire, no soldering, just put cables together. Easy for nearly everyone) Works fine.

For more advanced "makers" you can add the BME280. You have to solder the 4 pins. Then use cables to put everything together. The BME provides humidity in a little bit better quality as the DHT, provides temp and additional provides air pressure. But: It provides the air pressure AS IT IS at your place. If you are are higher then the sea, you get lower values. eg. At about hight of 400m, you are about 50hPa lower than at hight of 0m. (the difference depends on humidity and temp!). So using the air pressure will not give you a direct comparable value for your weather forecast!

The PMS-Sensors are cheaper than the SDS011, they are supported by the software to have another sensor as the SDS011 would not be available at your place. They are smaller, if you are limited in space.

DS18B20 is a very often used sensor. Often this is provided with some aduino boards.

I have DHT22 AND BME280 on my actual board. Runs fine. But do not overweight the air pressure ;-) With the BME280 you have a good choice.

PMS7003: If you buy one, have a look that a cable is provided by the seller. I bought mine without a cable. The pins are in 1.27mm distance, not the 2.54mm distance. IMHO for getting comparable values, it should be good, when most nodes have the same (SDS011) dust Sensor.

svenkubiak commented 6 years ago

@dokape Thanks a lot!

IMHO for getting comparable values, it should be good, when most nodes have the same (SDS011) dust Sensor.

Makes sense. Totally agree.

Which one is the correct BME280? https://www.adafruit.com/product/2652 https://www.reichelt.de/Kombosensoren/BME-280/3/index.html?ACTION=3&GROUPID=6845&ARTICLE=159825

ricki-z commented 6 years ago

From the Luftdaten.info team:

Recommended PM sensor is the SDS011. All other PM sensors were included for comparison tests or for users that will use our firmware for own projects. I.e. a belgian group will use the Honeywell sensor but wouldn't write a new firmware.

Recommended temperature/humidity sensor is the DHT22 or the BME280 if possible. The BME280 has a higher price and/or you need to solder the connector pins/cables.

ToronMega commented 6 years ago

Hello, great project.

I think it would be great to integrate this sensor (MQ-2 -> Gas, Smoke).

Because my idea behind it is to recognize what kind of "pollutants" are in the air. For example, if an neighbor has just started his carmine again, or something similar.

My house has a KWL, and I would like to start the KWL if the air quality is best... (PM10 & PM2.5 low and no Smoke in the air)

Regards

Adorfer commented 6 years ago

there is to contraints to MQ2 and other organic sensors:

ToronMega commented 6 years ago

I understand that, but lifetime of MQ2 or electricity bill are a minor problem, when your neighbour is burning plywood in his fireplace.

And the great steam is sucked into the house by the KWL or an open window.

Regards

ricki-z commented 6 years ago

@ToronMega Note from 'Seeed studio' website: "The sensor value only reflects the approximated trend of gas concentration in a permissible error range, it DOES NOT represent the exact gas concentration. The detection of certain components in the air usually requires a more precise and costly instrument, which cannot be done with a single gas sensor. If your project is aimed at obtaining the gas concentration at a very precise level, then we don’t recommend this gas sensor." We will add support for the Bosch sensor BME680. This sensor will measure VOC (Volatile organic compounds) and will give an Air Quality index for this. Most of the gases detected by the MQ2 can be detected by the BME680 also. And the BME680 can measure temperature, humidity and pressure also. Would this be okay for you?

ToronMega commented 6 years ago

Sounds good :-) I am curious. I look forward to the implementation.

Thx :-)

coelner commented 6 years ago

keep in mind that the bme680 is for INDOOR quality, not outdoor air quality. usually official stations measure PM10 (not PM2.5), NO2, O3, CO and SO2 (https://en.wikipedia.org/wiki/Air_quality_index#CAQI). As seen here : http://www.libelium.com/development/waspmote/documentation/gases-board-technical-guide/ there are a bunch of sensors which could be added to determine a general air quality, especially in cities. The MQ-X winsen sensors are tricky to use because old fashioned analog sensors. Therefore I would use the sensors from sgx, at least the do not need a heating cycle or relatively high heating voltage.

Usually you need to replace those sensors after 6 months, humidity and harsh environmental load destroy them. O3 and NO2 are very similar, even if we determine only a drift in these things, we need two sensors to correlate the measurements. SO2 sensors cost about 100€/USD

constant5 commented 6 years ago

I would like to integrate a CO monitor into a couple of these PM monitors for a short research project. Is there some script to add another analog output voltage to the NodeMCU?

pluisi commented 6 years ago

Nodemcu has only one analog input. You could buy additional boards and/or ICs called ADCs that can read analog signals into digital ports.

A totally partial list follows:

Good luck Pier

Il mar 31 lug 2018, 16:04 constant5 notifications@github.com ha scritto:

I would like to integrate a CO monitor into a couple of these PM monitors for a short research project. Is there some script to add another analog output voltage to the NodeMCU?

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constant5 commented 6 years ago

Thanks Pier. Do you think the ADC is better than using a multiplexer?

pluisi commented 6 years ago

A multiplexer can have problems related to signal conditioning if readings are too fast, while the addADCs strategy has the only limitation of the sampling frequency. Just think of your application and how fast are giving a read. Make your calculations on costs. Decide what's better. Have fun Pierluigi

Il mer 1 ago 2018, 13:36 constant5 notifications@github.com ha scritto:

Thanks Pier. Do you think the ADC is better than using a multiplexer?

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step21 commented 5 years ago

Hi,

hope it is okay to still post here - what do people think about this shield advertised for raspberry pi etc. - https://shop.pimoroni.de/products/enviro-plus in conjunction with the pms5003 https://shop.pimoroni.de/products/pms5003-particulate-matter-sensor-with-cable ? Not the cheapest but it has a lot of sensors. I read above that the pms5003 is not recommended/deprecated due to being bulky, but to me that seems like minor concern/non-issue. I am more concerned about how to hang the sensor, protect it from rain and so on. Especially as the pm sensors or at least the pms5003 have a fan + airflow, so this would somehow have to be protected as I guess it is not ideal if it rains into the fan or similar... How is this handled normally?

MagTun commented 5 years ago

We will add support for the Bosch sensor BME680.

@ricki-z, are there any news about this? (BME680 is awesome: it measures a lot of stuff including the Volatil Organic Compounds)

dirkmueller commented 4 years ago

see #411 for tracking the BME680 support. I've ordered one and started adding it, but the added code size was throwing me off.. will look at it again shortly.