New Kickstarter Campaign!!!: Raspberry Shake 4D

[Branden Christensen]

View this email in your browser Next week we will launch the Raspberry Shake 4D on Kickstarter! Hello Shakers! Say hello to the latest Raspberry Shake 4D prototype: Our previous Kickstarter campaign was a resounding success- a Kickstarter Staff Pick that overshot its funding goal by 1,400%! Thanks to your support we brought you Raspberry Shake (1D), the world’s smallest and most powerful professional-grade personal Earth monitoring device. Since our last campaign, we have listened to your feedback and we have been working nonstop to make the next generation of Raspberry Shake even better. Today we are proud to introduce the Raspberry Shake 4D. The 4D combines all of the greatness of the original Raspberry Shake with a 3-component +/- 2G MEMs accelerometer. This will ensure that your Raspberry Shake does not go off-scale for big local events. Quadrupling the input sensors forced a redesign of the original Raspberry Shake. We went back to the drawing board and redesigned the Raspberry Shake circuit board to incorporate a processor that could not only cope with this extra data, but could more than double the quantity of data processed per second to measure a wider range of Earth motion. The circuit board of the Raspberry Shake 4D now incorporates four 24 bit digitizers, each sampling the Earth’s motion at 100 (!) samples per second (double its predecessor). We have also been able to boost the data transmission rate from one packet per second to four, which makes our latest version of the Raspberry Shake Earthquake Early Warning compatible. With the Raspberry Shake 4D we want you to get as much out of it as possible, even when you aren’t at home or behind your computer. You will now be able to pair your Raspberry Shake 4D with If This Then That (IFTTT) protocol, to get instant notifications of any ground motion. Easily send updates or notifications of any Earth shakes to your phone, email or any social networks. There are endless other IFTTT compatible devices which you will be able to connect with your Raspberry Shake 4D, so the only limit is your imagination! How about connecting to your WeMo lighting or smart plug for example?! Any software improvements will be rolled out to all of your Shakes too, so please help us get the word out! The more successful the campaign, the more software enhancements we will be able to roll out to ALL Shakers.   The Raspberry Shake 4D has something for everyone and we will be launching it within the next 2 weeks on Kickstarter. We will update the link raspberryshake.org/kickstarter-4d with the Kickstarter campaign link as soon as it is available.  Last year you helped us to make the original Raspberry Shake a reality and now with the launch of the Raspberry Shake 4D, it would be great to count on your support again. We have some awesome early bird specials prepared for you, so we will keep you informed of the launch date to make sure you can take advantage of them. See you at the Launch! Please remember to like and share the Raspberry Shake 4D with your friends and family and tag us @raspishake ;) Thank you for helping us spread the word. Sign up for your chance to win a 4D. Link to campaign: raspberryshake.org/kickstarter-4d Links Get your Raspberry Shake up and running: Quick Start Guide including some helpful YouTube videos Complete User manual Google Group Technical Support Forum DIY resources including SD card image Some more useful links: Website Shop  The Original Kickstarter Campaign Newsletter Archive Web products StationView EQView Social Media: @raspishake Instagram Twitter Facebook Google+: share photos of your Shake, seismograms and pretty much anything else here Saludos from Panama,

[Branden Christensen]

Hi John!

1 velocity channel and 3 acceleration channels. 

Actually, the early bird backer prizes will be ~350/ turn-key unit, or 25 less than a normal Magnitude 9 Shake!

yours, 

Branden Christensen

Director, OSOP & Gempa GeoServices

Director, Raspberry Shake project, Social Media: @raspishake

USA: +1-845-418-5735; Panamá: +507-6747-1427

Sign up for your chance to win a Raspberry Shake 4D.
Link to upcoming Kickstarter campaign: raspberryshake.org/kickstarter-4d

On Fri, Jul 7, 2017 at 12:09 PM, John Beale <beale...@gmail.com> wrote:

On Friday, July 7, 2017 at 6:59:18 AM UTC-7, Branden Christensen wrote:

Today we are proud to introduce the Raspberry Shake 4D.

Looks impressive!  With 3 geophone sensors and a 3-axis accelerometer, I would think you have six channels of data, so I guess the 4 ADC units are multiplexed somehow?  The 100 Hz sample rate will see more of the "cultural noise" signatures, if that's of interest. I expect that level of hardware will be out of my price range but I look forward to reading more about it.

--
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[John Beale]

Can you give some indication of how much higher the noise floor of the 3-axis MEMS accelerometer is, as compared with the geophone?  And/or, how close would a M3, M4, M5 EQ have to be for it to come out of the noise on the accel signal?  There is already an app http://myshake.berkeley.edu/ that uses a cellphone accel sensor for sensing and reporting local quakes; I gather the Shake 4D would have similar output but without needing to tie up your phone (?)

[Branden Christensen]

Can you give some indication of how much higher the noise floor of the 3-axis MEMS accelerometer is, as compared with the geophone?

Sure thing John! The answer is a lot higher. Here in the lab, for example, the noise level of the velocity channels (geophones) is roughly 100 counts peak-to-peak. The accelerometers have a lot more instrument noise inherent to them and display roughly 3-4000 counts of noise peak-to-peak. Whereas the velocity sensors will register the tiny-ist of movements and earthquakes, the MEMs accelerometers kick in with stronger motion. Most of the time they hum along not doing anything interesting until, that is, there is a good-sized local earthquake. Here we had one about a few months ago when I began testing the first prototypes. It was a magnitude 5.5 about 20 kilometers from our office. And the accelerometers registered the event beautifully on all 3 channels. See attached for a nice graphic of the event. The accelerometer channels are EN*. The HN channels are from a reference sensor- a very expensive Nanometrics Titan, class A accelerometer. EHZ = velocity.

 

 And/or, how close would a M3, M4, M5 EQ have to be for it to come out of the noise on the accel signal?

Hard to say precisely but close. Within 10s of kilometers for sure. These extra channels are ideal in that way for people who live in high seismic zones, like some of our backers in New Zealand, Oklahoma or California, for instance. I see you are Swarthmore in Pennsylvania is it? I do not think there is much strong shaking there or am I wrong?

 

 There is is already an app http://myshake.berkeley.edu/ at uses a cellphone accel sensor for sensing and reporting local quakes; I gather the Shake 4D would have similar output but without needing to tie up your phone (?)

We use similar technology as to that you would find in your cell phone. So yes, you are correct in that sense here. 

Thank you for your questions and good to hear from you John!

Branden

[paul denton]

This is quite a good comparison of resolution and noise performance of a range of mems accelerometer chips http://quakecatcher.net/sensor-performance I'm not sure what chipset 4d is using but I guess it will be close to the best qcn option http://quakecatcher.net/earthquakes/images/amp_dist_map.jpg . As Branden says performance will be similar to that of Berkeley MyShake smartphone app but smartphone apps really only give good accn data when they are on charge overnight and you don't get to play with the data yourself.

[John Beale]

On Friday, July 14, 2017 at 10:30:58 AM UTC-7, John Beale wrote:

Hi Branden,

Thank you for your reply and those plots. It looks like for that size of quake, you've got a great matchup between your Nanometrics and the Shake device.  I am in San Jose CA, about 16 km away from the San Andreas fault line, so yes there is a quite good chance of strong motion here, if you wait long enough :-).  It seems to me the X-Y-Z accelerometer data might also be good if you're interested in the exact forces that buildings experience during a quake, at least more useful than the Z-only geophone which will go offscale with strong motion.

[mcq]

If it's of any interest the strong motion unit I developed can use a range of accelerometers. Presently I have the MPU6050 in operation, mostly because I have several from other projects and they're relatively inexpensive (and interface to the Pi well).

Currently I am sampling at 200sps (pre-configurable in the code) without the MPU's on-board filter switched in (also configurable). I have the output calibrated in milli-g and the typical raw noise level at rest is in the region of +/- 10-15mg with the occasional spike to 20mg.

I can create detectable vibration as little as 20-30mg that will trigger recording and show on the raw and filtered output plots, and the unit successfully also records moderate to strong earthquakes from some distance away. However it's not really intended as a seismograph - I developed this as a seismic monitor for building assessment post-earthquake. In this guise I'm interested in levels of 100mg or more, well over the noise floor of the unit as a whole, and these MEMS accelerometers in particular.

[NeilT]

mcq
Is that a project you re willing to share or based some public software?
Sounds interesting

[mcq]

Hello Neil.

In principle yes, although I've not completely thought through that. BTW it's my code - not public software.

Presently though I am most mindful that this forum is for Shake users, and that they are at least a quasi-commercial activity. So out of respect for the Shake guys I don't feel this is quite the place to discuss other systems - my comment was mostly intended to give an idea of my experience with application of MEMS accelerometers, given the discussion that was being held.

However I wonder where you are located? I had an idea you might be in NZ? If so, and particularly if you're in Canterbury then I'd be happy to go over this with you...

[Neil Trimboy]

mcq,

Thanks for reply. I don't seem to be able to send PM messages on this board . Could Branden enable that?

I'm a private individual, just a geek fiddling (software/hardware background). Not a geologist/earthquake/construction person either so no vested interests.

Currently out of work so time on my hands, I was about to hook up an Adafruit MEM to a pi when the 4D was announced.

I think you are in ChCh somewhere or Banks Peninsula?

I am north of the Waimak river between Rangiora and Oxford - (there are two GeoNet strong motion sensors within about 5km of me.)

http://raspberryshake.net/stationview/#?net=AM&sta=R3B91

Neil

AM.R3B91.00.SHZ (although the current plots have gone to pot today because of all the wind/rain! Shake 1D is resting on my concrete floor slab)

--
Some useful links:
 
Manual: http://manual.raspberryshake.org/
Do It YourSelf Page: http://raspberryshake.org/do-it-yourself
Shop: https://shop.raspberryshake.org/
Website: http://raspberryshake.org/
 
Instagram: https://www.instagram.com/raspishake/
Facebook: https://www.facebook.com/raspishake/
Twitter: https://twitter.com/raspishake/
Hashtag: #rasperryshake
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