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Ask HN: What have you built with your raspberry pi?

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Re: Ask HN: What have you built with your raspberry pi?

#2

Post by fnordfnordfnord »

A retro arcade for my kid. There are hundreds of examples.

FM Stereo transmitter (I needed a signal to test my rtl2832 SDR indoors).

Home automation. This is the only project that has any 'unique' work, the others were just "follow the examples".

I'm converting a mobility scooter into a semi-autonomous robot but, nothing impressive to report yet.

Re: Ask HN: What have you built with your raspberry pi?

#4

Post by canadaj »

A temperature sensor for BBQ smokers.

Simple thermocouple with an Adafruit breakout board (MAX31855), and an existing Python driver.

Also serves up a Nodejs static page that polls for a new temperature every 5 seconds.

I'm struggling to find the time to get this going, but it's working okay right now. https://github.com/CanadaJ/heat-of-my-meat-node

Re: Ask HN: What have you built with your raspberry pi?

#5

Post by Jemaclus »

Nothing yet. Still waiting for inspiration...

I have a few ideas that I'd kinda like to pursue:

* An LCD display that shows the local transit times, so I know when to head out to catch a bus/train * An LCD display that shows my weekly mileage (running) and other relevant stats, maybe for other people I follow, too * An LCD display that alerts me if it I missed a phone call or text.

I guess the first step is figuring out how to hook up an LCD to my Raspberry Pi... :)

Re: Ask HN: What have you built with your raspberry pi?

#8

Post by wil421 »

canadaj wrote: post #4

A temperature sensor for BBQ smokers. Simple thermocouple with an Adafruit breakout board (MAX31855), and an existing Python driver. Also serves up a Nodejs static page that polls for a new temperature every 5 seconds. I'm struggling to find the time to get this going, but it's working okay right now. https://github.com/CanadaJ/heat-of-my-meat-node

Came here to say this is what I have been wanting to build. I did some research a while back but I was trying to find a USB thermistor that would work with high temps. All I could find was devices that were probably meant for measure outside temp or ambient air temp.

Re: Ask HN: What have you built with your raspberry pi?

#9

Post by canadaj »

wil421 wrote: post #8
canadaj wrote: post #4

A temperature sensor for BBQ smokers. Simple thermocouple with an Adafruit breakout board (MAX31855), and an existing Python driver. Also serves up a Nodejs static page that polls for a new temperature every 5 seconds. I'm struggling to find the time to get this going, but it's working okay right now. https://github.com/CanadaJ/heat-of-my-meat-node

Came here to say this is what I have been wanting to build. I did some research a while back but I was trying to find a USB thermistor that would work with high temps. All I could find was devices that were probably meant for measure outside temp or ambient air temp.

I'm not sure what kind of BBQ you are into, but my dad and I do quite a few competitions every year, and the temperature inside the smoker itself is more valuable than the temperature of your meat. It's easier to consistently get your smoker temperature to what you want than attempting to cook your meat at specific temperatures, considering no piece of meat is alike another. Obviously we check the internal temp to make sure it's safe, but it's easier to keep the smoker at 250f for 4 hours than to make sure your internal temperature stays at whatever degree for 4 hours.

I would absolutely recommend any type of K-type thermocouple, because they can handle the heat that the BBQ will spit out. In fact, the one I used for testing and initial development was directly from Adafruit[0]. It works well, it's just a little flimsy. It's not USB, however.

[0] http://www.adafruit.com/products/269

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