Are there any individuals or services that will build a custom air quality sensor from individual components for a fee? I am mainly interested parties in a couple humidity+temp+co2 boxes (wifi,zigbee,zwave or cable)

(Airgradient is prob ideal but too expensive)

I want to create a custom dashboard web app thing for the purpose of learning and to make it avalaible for selfhosted servers.

The plan is to use existing linux cli tools as much as possible.. Which of them do you think are appropriate for that purpose?

There is a nice list in this blogpost but I dont have any experience with any of them: https://www.brendangregg.com/blog/2024-03-24/linux-crisis-tools.html

I want a switch with a few POE ports but it needs to be as low power as possible as I rely in solar.

Any recommendeations?

Any low power security cameras that would recommend with night vision and decent quality? Ideally non-smart without a cloud option as I would like to connect it directly to an offline server with a cable or wifi (although not having a wifi might be better)

I have a steel frame and I'm looking on getting aluminum parts (eg: seatpost, headset etc)

Is Corrosion a concern?

Will I need to service the bike more frequently?

Is lube between the two metals going to make any difference?

Im building a single speed mini velo with 20inch bmx wheels.

Right now Im at the process on building its wheels and I was thinking on getting bmx hubs instead of 'normal size bike wheel hubs' because they are cheaper.

Are there any downsides on doing that? Is there a substantial difference between these two types or it is just a marketing thing?

I want to build my own wheels.

What I got so far are the rims: https://www.flybikes.com/product/fly-lunar-lite-rim-black/RLRL03

And some potential hubs: Rear: https://www.tritoncycles.co.uk/components-c9/hubs-and-spares-c120/hubs-c591/surly-ultra-new-rear-disc-mtn-hub-p9851 Front: https://www.tritoncycles.co.uk/components-c9/hubs-and-spares-c120/hubs-c591/sp-dynamo-pv-8-power-dynamo-ultra-small-front-hub-p11398

I would like to get some sapim spokes but all the online calculators online are failing me because I cant find all the data points they ask: https://www.sapim.be is there an easy way to do that? Should I order the components first and measure them myself? (I felt that is kinda risky as I want to make sure everything would be compatible first)