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jonaswi's comments

jonaswi | 8 months ago | on: Ask HN: What cool skill or project interests you, but feels out of reach?

thank you for evcc - awesome pice of software that I'm using every day. I actually built some small prediction models around it figuring out if I should charge my car or feed in the electricity. Not sure if that is what you have in mind but I would be interested to hear what kind of algorithm you have in mind. Maybe I can help?

jonaswi | 6 years ago | on: Ask HN: What do you do with your Raspberry Pi?

The door stays open for n amount of time (normally around 1min but I changed it to 30sec). The drive has a laser sensor attached to it (it is required to have installed with automatic doors in Switzerland if you don't want any issue with insurance). As soon as the specified amount of time has passed, the door drive tries to close the door. It only works if the laser sensor detects no obstacles.

Maybe a bit off-topic but: The only thing that differs an "fire-protection approved" door drive from a non approved drive is that the drive is not allowed to have an option to keep the door open. Also in case of power outage (or fire) the door needs to close without power.

jonaswi | 6 years ago | on: Ask HN: What do you do with your Raspberry Pi?

I don't use this specific drive due to the fact that another company gave me a better deal for some marketing. But if I had to choose again, I would buy a dormakaba ED 100 or ED 250 (depending on the weight of your door). They support multiple opening angles depending on how you activate it.

jonaswi | 6 years ago | on: Ask HN: What do you do with your Raspberry Pi?

No sadly not. I'd love to write about it but my English is just not good enough to write a compelling story. Writing it in German and then having it translated is always a bit of a hassle. But I may consider it. At the moment I have an offer of the door drive manufacturer for doing a "home story" about the solution. If that will happen, it will definitely be released in English.

I will open source everything once I'm happy with the security and the ability to configure it.

jonaswi | 6 years ago | on: Ask HN: What do you do with your Raspberry Pi?

As you might have guessed, that came to my mind too. Due to the fact that I have worked with a company in the fire damper business, I was contacting them and we were brainstorming about it. The thing is: The market is just non existent. Also fire-protection regulations can be very specific depending on the country you are in. For example, EU ratings are not always recognized here in Switzerland.

Since last week I'm in contact with the manufacturer of the door drive tough because they maybe want to create a product out of it. To be honest I think it would pure marketing and at the moment it is very unlikely to ever hit the market.

jonaswi | 6 years ago | on: Ask HN: What do you do with your Raspberry Pi?

You are exactly right. Before I "optimised" the image recognition the whole detection part was running on a Mac Mini. I also like to "separate concerns". The Pi that is handling the door opening runs Alpine with a read-only file system so whenever there is a power outage or whatever it boots into a known good state. The image processing part is behind a big UPS and is running with a writable file system.

jonaswi | 6 years ago | on: Ask HN: What do you do with your Raspberry Pi?

I live in an apartment with quite strict fire-protection standards. Due to the fact that I have a cat that absolutly loves to go outside, I needed to find a solution for him to get outside without a catdoor trough my door.

So I installed a fire-protecion-approved door drive that is hooked to a raspberry pi. Another raspberry pi then analyzes a video stream and detects my cat. If my cat is in the frame for n amount of time, a message is sent to the pi conntected to the door drive and the door opens up slightly for him to get in.

jonaswi | 7 years ago | on: IPv6 breaks the 25% barrier

I was working for one of the "big" 3 planning the rollout of IPv6 in their cellphone network. They stopped the project due to budget concerns. Doesn't seem to be too high of a priority for them.

jonaswi | 7 years ago | on: You Gave Facebook Your Number for Security. They Used It for Ads

I too protect my phone number like my SSN. When a lot of services started to offer 2FA via mobile nimber I bought a cheap SIM Card and used a raspberry pi I had laying around to build a SMS<->Telegram bot. I now use this mobile number for 2FA services or services I don‘t trust.

jonaswi | 8 years ago

I just recently switched from using PhantomJS to pupeteer for PDF generation in a production application. Works like a charm and has a very clean API.
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