Cool basically if you get something working, I’d recommend still running it from an ESP just because they are smaller, cheaper and usually more powerful.. if you need any help let me know

So funny, when I first asked the question and you started talking about ESP stuff I had no idea what you were talking about except it sounded like extra work.

Now I find myself looking at them and thinking that's the next step. I just need to work my way through the Arduino boards I've bought so far first haha.

I'm building a fairly broad air quality monitoring gadget which is currently using a Mega as the number of sensors exceeded the Unos capabilities. Already I'm thinking that WiFi would be nice, but maybe I'll keep that for V2.

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Version 2.0 with fan control. Makes a huge difference, thanks knighty.

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It's just a bog standard 0.96" I2C oled display. Was going to put a scrolling graph but not enough memory on the nano.

No clear pictures of the inside, but details are:

Nano Pro microcontroller.
BME280 temp/humidity sensor
5v relay
5v 1" fan
0.96" oled
Thin film pressure sensor
RGB led with resistor.
Active buzzer

The fan is hooked to the relay which is hooked to the 5v out pin.

The pressure sensor is on the 3.3v rail so max analog output is 6xx. Basically have the door open alarm set so that when the pressure drops below 500 it's open, turns fan off, and starts the countdown to the buzzer going off. Also changes the Led from green to red.

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Nice, looked like you’ve got it pretty compact too!

I just bought a pack of 10 d1 minis for temp/humidity monitoring through the house.

Still have a big air quality monitoring project to work on but the sensors are pretty naff. Tend to drift and don't provide very meaningful results.

The D1's will be ideal for that, just a couple of things to consider for temp monitoring, which might not be so much of an issue with the BME280 but I had a couple of challenges when using a thermistor.. Obviously proximity to the ESP/Arduino can throw the readings off just due to the heat being generated from it, but the other issue I found using a thermistor was that keeping it powered constantly would cause itself to generate heat throwing off the readings over time (which is kind of obvious in retrospect) but was just using what I had handy at the time!

Yeah, have found getting things into a small package the biggest challenge. Many headaches!

Tend to solder most stuff on but then have to use header pins to do final connections between the two sections using a pair of tweezers to hook em up!

On the D1 this is where the stackable proto boards can come in handy BTW

Heh, I think temp changes are what are throwing my air sensors off. Get everything stable and take it outside and it instantly reads a different value. Not because there's H2S in the air, but because its gone from 20 degrees to 10.

Will probably need to build in temperature compensation but not all the sensors data sheets provide temperature offset info.

Also, have you noticed how hostile the Arduino forums are? I've never seen anything like it. Literally all questions have to be written in such a detailed way that takes way too long to do or they descend en masse to have a go at the poster.

And on the rare occasion they're polite, inevitably they start bickering amongst themselves.

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Heh, I think temp changes are what are throwing my air sensors off. Get everything stable and take it outside and it instantly reads a different value. Not because there's H2S in the air, but because its gone from 20 degrees to 10.

Will probably need to build in temperature compensation but not all the sensors data sheets provide temperature offset info.

Also, have you noticed how hostile the Arduino forums are? I've never seen anything like it. Literally all questions have to be written in such a detailed way that takes way too long to do or they descend en masse to have a go at the poster.

And on the rare occasion they're polite, inevitably they start bickering amongst themselves.

I've not been on there in a long time, mostly I manage to get more immediate answers by either googling or my question is about a specific repository where I'll generally raise a question to the dev via github or their discord etc.. Reddit can sometimes be useful too, the esp8266 group is pretty good..

Thought I'd follow up on this thread. Since that initial project back last year, I've ended up making:

* A WiFi doorbell with unlimited range (using repeaters) to work as an intercom at work. Added benefit was the chime was the imperial march from Star Wars.

* A temperature and humidity sensor network around our house. Can view the data on my phone and it all gets logged to a Google sheet too, so is remotely accessible

* a similar sensor arrangement for work to track temperatures when our air con broke. Had to figure out how to get through our WPA WiFi security for that one!

* an octo alert buzzer box for my son. He's a massive fan of the show. So he presses the big button, and the octo alert sounds and flashes some LEDs. It also sends a trigger via IFTTT to turn our house smart lights red for a few seconds during the alert!

* another toy for when he was much smaller, had a few buttons that would turn LEDs on and off or play different tunes.

* a mothballed UV sensor (uv is super strong in NZ). Canned it as I needed to find some kind of fresnel lens that would transmit UV. Most are for visible or IR so wouldn't work.

*a mothballed air quality sensor that was going to monitor all sorts of parameters. Then I realised that the sensors are pretty basic and for any kind of meaningful result they'd need frequent calibration.



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