Ask HN: What do you do with your Raspberry Pi?

Re:Ask HN: What do you do with your Raspberry Pi? by quartz on Monday June 24, 2019 @12:36PM (#20265388)

The coffee machine in our office is controlled by blockchain NFTs and a Raspberry Pi:

Once authenticated, an owner of the NFT can select their coffee type on their phone which then signals the Raspberry Pi to make whatever coffee type was selected by jumping the contacts that used to be pressed by the machine's buttons (which have been removed).

It's a cool gimmick, fun to show off to visitors, gives us a nice record of who is making coffee (since each NFT's owner is unique and trackable), limits users to those with the NFT without us having to build usernames/passwords, and is also how I make my coffee each afternoon.

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Re:Ask HN: What do you do with your Raspberry Pi? by trimbo on Monday June 24, 2019 @04:25PM (#20268063)

Does it record on the blockchain who took the last cup of coffee and didn't make more?

Everyone in every office would pay good money for that.

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Re:Ask HN: What do you do with your Raspberry Pi? by quartz on Monday June 24, 2019 @09:55PM (#20270505)

It doesn't write individual orders to the chain. It could if we funded a wallet to pay the gas to write those records but right now it just does authentication of NFT ownership to grant access, which is conveniently free. The history logs are stored locally.

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Re:Ask HN: What do you do with your Raspberry Pi? by Piskvorrr on Monday June 24, 2019 @02:19PM (#20266646)

Is it HTCPCP-enabled? Inquiring minds want to know!

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Re:Ask HN: What do you do with your Raspberry Pi? by jtolly710 on Monday June 24, 2019 @03:04PM (#20267198)

Hopefully including HTTP Error 418 too!

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Re:Ask HN: What do you do with your Raspberry Pi? by myhay on Monday June 24, 2019 @03:53PM (#20267737)

Very similar to what we have in the office as well. The difference is that we are using bluetooth and NFC of the mobile as authentication method.

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Re:Ask HN: What do you do with your Raspberry Pi? by amelius on Monday June 24, 2019 @03:15PM (#20267324)

> gives us a nice record of who is making coffee

Is that allowed by GDPR?

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Re:Ask HN: What do you do with your Raspberry Pi? by coolspot on Monday June 24, 2019 @03:32PM (#20267506)

If you don't serve cookies it is okay.

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Re:Ask HN: What do you do with your Raspberry Pi? by quartz on Monday June 24, 2019 @09:45PM (#20270468)

If an EU user tries to make coffee we redirect them to a "this content is unavailable in your region" page so I think we're 100% good to go with GDPR compliance.

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Re:Ask HN: What do you do with your Raspberry Pi? by notdang on Monday June 24, 2019 @03:52PM (#20267732)

What coffee machine are you using?

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Re:Ask HN: What do you do with your Raspberry Pi? by quartz on Monday June 24, 2019 @09:49PM (#20270484)

It's a Nespresso Lattissima-- the old version where the buttons were physical push-to-press. We pulled the buttons off and soldered wires to the board inside via a 4-channel relay.

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