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Show HN: Enviro+ for Raspberry Pi – Environmental sensors

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Re: Show HN: Enviro+ for Raspberry Pi – Environmental sensors

#71
post #64

By coincidence I actually need this -- going to be doing some data analysis on indoor hydroponics grow rooms and this would give me all the environmental data I need if you include the particulate matter sensor.

I was thinking the same, would be really nice for hydroponics!

Re: Show HN: Enviro+ for Raspberry Pi – Environmental sensors

#73

I was looking into some hobby sensors for home recently and came across this the Ruuvi [1]. I prefer this model to having on-board sensors. This doesn't do everything the Enviro+ does, but for a lot of use-cases it's pretty nice and affordable. [1] https://ruuvi.com/personal/

Seems like the battery for ruuvi is not replaceable?

Re: Show HN: Enviro+ for Raspberry Pi – Environmental sensors

#74
post #56

Earlier quoted context omitted.

can be disabled. But then I'd recalibrate them after a few months. (I do it after 6 months usually)

Which sensors do you use? Are you happy with them overall?

MH-Z14 and MH-Z19.

Yes, for the price absolutely.

Re: Show HN: Enviro+ for Raspberry Pi – Environmental sensors

#75
post #74

Earlier quoted context omitted.

Which sensors do you use? Are you happy with them overall?

MH-Z14 and MH-Z19. Yes, for the price absolutely.

Are you using hass.io? Its plugin for MH-Z does not support switching auto calibration off, and in not sure how to do it.

Re: Show HN: Enviro+ for Raspberry Pi – Environmental sensors

#76

Weirdly coincidental timing on this! I've been working on a PCB design (FeatherWing form factor) to track weather data on my hikes, making use of a BME280 and a GPS module. First revision of the board[1], I discovered that the sensors started out accurate, then drifted up to a steady 3° above ambient. Probably because the GPS module was heating up. So last night I found myself reading up on design considerations for…

The BME280 is not particular suited for ambient temperature measurements. It's for accurate and fast pressure and humidity sensing. Quote from the datasheet about the temp sensor: Its output is used for temperature compensation of the pressure and humidity sensors and can also be used for estimation of the ambient temperature. You will get the temperature of the sensor rather than that of the environment. The tiny BME280 is thermal coupled to the board and also heats itself up during repeated measurements. For accurate ambient temperature you could use a DTH11 or DHT22. These come in plastic housings to isolate them from the surroundings and provide better airflow.

Re: Show HN: Enviro+ for Raspberry Pi – Environmental sensors

#77
post #54

This looks great. I've been waiting for a nice, hackable, cheap set of environmental sensors! There's only one "improvement" I would like to see - an option to buy a cheaper version without a display attached. For my application I will not need any display, and it seems a shame to spend resources on one when it's only going to get destroyed by the elements :)

A raspberry is quite an overkill for an environmental sensor. You could achieve the same with an Cortex M4 (minus the microphone).

Re: Show HN: Enviro+ for Raspberry Pi – Environmental sensors

#78

I was looking into some hobby sensors for home recently and came across this the Ruuvi [1]. I prefer this model to having on-board sensors. This doesn't do everything the Enviro+ does, but for a lot of use-cases it's pretty nice and affordable. [1] https://ruuvi.com/personal/

Do I understand it correctly that this doesn't store the data, and uses bluetooth so you only see data for times when your phone was nearby, and on iOS when the app was open?

That sounds kind of limiting. I guess every hacker has old smartphone somewhere that can be used for that.

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