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Ask HN: Share Your Raspberry Pi Project

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Re: Ask HN: Share Your Raspberry Pi Project

#121

Post by zitterbewegung »

djmips wrote: post #114
zitterbewegung wrote: post #26

Me and My brother made a strobe light based on a Nature paper to attempt to treat my Uncle for Alzheimers. See http://www.nature.com/nature/journal/v540/n7632/full/nature2...

Do you have any more information about your project?

Yes, I think I prodded my brother to write a blog post but I will write it myself and try to get to it this weekend.

But basically the steps you would have

1. Get a Raspberry pi (obviously) and load linux with python support.

2. Use this shield https://www.amazon.com/Pimoroni-Unicorn-Hat-Shield-Raspberry...

3. Create a python script that blinks with the HZ that was in the Nature paper.

Re: Ask HN: Share Your Raspberry Pi Project

#122

Post by btschaegg »

MattGrommes wrote: post #92
davexunit wrote: post #21

Just yesterday I used an old raspberry pi to make a bluetooth audio receiver that could be integrated with my vintage stereo equipment. You can buy something off the shelf for around $25 but they use cheap digital-to-analog converters and I wanted to use the high quality USB DAC I already had. Total hardware needed was the Pi, powered USB hub, USB DAC, and USB bluetooth adapter. Potato quality photo of the very advan…

Did you have to use the USB bluetooth adapter with a Pi 3? I know the 3 has bluetooth but I don't know enough about it to know if I can just connect my phone to it to play music. I want to do something very similar to what you've done so I'm excited to see that somebody else succeeded.

I did the same thing using a HifiBerry-Hat (used the Pi as a Mopidy server before, but I like the Bluetooth setup better for UI reasons).

If you're using BlueZ and Pulseaudio, it comes down to a couple of simple config entries (google for Linux Bluetooth A2DP Sink).

I used a RPi 2 with a USB Dongle for the Bluetooth though, so I can't vouch for the internal Bluetooth of the RPi 3.

Re: Ask HN: Share Your Raspberry Pi Project

#123

Post by davexunit »

MattGrommes wrote: post #92
davexunit wrote: post #21

Just yesterday I used an old raspberry pi to make a bluetooth audio receiver that could be integrated with my vintage stereo equipment. You can buy something off the shelf for around $25 but they use cheap digital-to-analog converters and I wanted to use the high quality USB DAC I already had. Total hardware needed was the Pi, powered USB hub, USB DAC, and USB bluetooth adapter. Potato quality photo of the very advan…

Did you have to use the USB bluetooth adapter with a Pi 3? I know the 3 has bluetooth but I don't know enough about it to know if I can just connect my phone to it to play music. I want to do something very similar to what you've done so I'm excited to see that somebody else succeeded.

I used the very first version of the Raspberry Pi model B. I bought one when they became available years ago and then never did anything with it. If the Pi 3 comes with a bluetooth chip built-in then you will just need to do some software configuration. There are three servers to configure: bluez, udev, and pulseaudio. I used the following gist as a guide, but didn't follow every step exactly:

https://gist.github.com/oleq/24e09112b07464acbda1

Hope this helps!

Re: Ask HN: Share Your Raspberry Pi Project

#124

Post by steverb »

elihu wrote: post #85

I built a microtonal keyboard: http://jsnow.bootlegether.net/jik/keyboard.html The keys have pressure sensitive film underneath that causes a voltage drop when you press on them. There's a wire from under each key that goes to an input on an MCP3008 ADC. There are 20 of those, each with 8 inputs, all connected on a SPI bus running at 2mhz. Effectively, this acts as a 160 channel digital voltmeter. The Pi can scan all…

That's a beautiful piece of work. Nice job!

Re: Ask HN: Share Your Raspberry Pi Project

#125

Post by elihu »

steverb wrote: post #124
elihu wrote: post #85

I built a microtonal keyboard: http://jsnow.bootlegether.net/jik/keyboard.html The keys have pressure sensitive film underneath that causes a voltage drop when you press on them. There's a wire from under each key that goes to an input on an MCP3008 ADC. There are 20 of those, each with 8 inputs, all connected on a SPI bus running at 2mhz. Effectively, this acts as a 160 channel digital voltmeter. The Pi can scan all…

That's a beautiful piece of work. Nice job!

Thanks.

Re: Ask HN: Share Your Raspberry Pi Project

#126

Post by jason_slack »

I'm using a Pi to capture the speeds and pictures of cars as they travel down my road. We then report the speeders to local law enforcement. I recently decided to expand to a 9 camera system (8 security cameras and 1 piCamera) and start capturing video, stills, speeds and car data. I then am able to show that the same car speeds everyday (or however often) and have a lot of useful data to hand over. My next step is to mount a large display on my property that shows the cars in big numbers just how fast they are going.

Re: Ask HN: Share Your Raspberry Pi Project

#129

Post by celticninja »

jason_slack wrote: post #126

I'm using a Pi to capture the speeds and pictures of cars as they travel down my road. We then report the speeders to local law enforcement. I recently decided to expand to a 9 camera system (8 security cameras and 1 piCamera) and start capturing video, stills, speeds and car data. I then am able to show that the same car speeds everyday (or however often) and have a lot of useful data to hand over. My next step is t…

I bet a screen showing their behaviour is more effective than reporting them to the police.

Re: Ask HN: Share Your Raspberry Pi Project

#130

Post by celticninja »

zitterbewegung wrote: post #121
djmips wrote: post #114

Earlier quoted context omitted.

Do you have any more information about your project?

Yes, I think I prodded my brother to write a blog post but I will write it myself and try to get to it this weekend. But basically the steps you would have 1. Get a Raspberry pi (obviously) and load linux with python support. 2. Use this shield https://www.amazon.com/Pimoroni-Unicorn-Hat-Shield-Raspberry... 3. Create a python script that blinks with the HZ that was in the Nature paper.

I think I saw someone else try a similar thing with an oculus rift or vive. How do you think it went with your relative.?
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