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Waveshare pi hat details
by Brian E. Lavender 19 Dec '23

19 Dec '23

Hi Everyone, Here are some notes (raw) on my "show-and-tell" raspberry pi with the Sense Hat (B). I also included a link to my github fork of the stratux. My fork of the Stratux project https://github.com/brieweb/stratux Sense HAT (B) for Raspberry Pi, Multi Powerful Sensors https://www.waveshare.com/sense-hat-b.htm Wiki page for the SenseHat(B) https://www.waveshare.com/wiki/Sense_HAT_(B) C program demos for the Sense Hat (B) https://files.waveshare.com/upload/6/6c/Sense-HAT-B-Demo.7z Datasheet for 20948 chip https://invensense.tdk.com/download-pdf/icm-20948-datasheet/ MPU9250 – 9-Axis Sensor Module – Part 1 https://wolles-elektronikkiste.de/en/mpu9250-9-axis-sensor-module-part-1 MPU9250 – 9-Axis Sensor Module – Part 2 https://wolles-elektronikkiste.de/en/mpu9250-9-axis-sensor-module-part-2 Explains the registers for the chip https://youtu.be/Oen3HqUbctM BCM 2835 library for talking through the Broadcom controller that connects to the I2C bus. https://www.airspayce.com/mikem/bcm2835/ Eric Westphal Go AHRS code https://github.com/westphae/goflying/ Code snippet ``` unsigned short I2C_readU16(char reg) { char buf[] = { reg,0 }; bcm2835_i2c_read_register_rs(&reg, buf, 2); int value = buf[1] * 0x100 + buf[0]; return value; } ``` -- Brian Lavender http://www.brie.com/brian/ "There are two ways of constructing a software design. One way is to make it so simple that there are obviously no deficiencies. And the other way is to make it so complicated that there are no obvious deficiencies." Professor C. A. R. Hoare The 1980 Turing award lecture

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debian network interface names
by Brian E. Lavender 18 Dec '23

18 Dec '23

When I tried updating the mailing list server, I got /dev/enX0 for the ethernet! Ugh. I found these documents on the interfaces. https://wiki.debian.org/NewInBuster#Network_interface_name_migration Anyone else encounter issues? Brian -- Brian Lavender http://www.brie.com/brian/ "There are two ways of constructing a software design. One way is to make it so simple that there are obviously no deficiencies. And the other way is to make it so complicated that there are no obvious deficiencies." Professor C. A. R. Hoare The 1980 Turing award lecture

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test test
by Brian E. Lavender 17 Dec '23

17 Dec '23

Mailing list working? Check check -- Brian Lavender http://www.brie.com/brian/ "There are two ways of constructing a software design. One way is to make it so simple that there are obviously no deficiencies. And the other way is to make it so complicated that there are no obvious deficiencies." Professor C. A. R. Hoare The 1980 Turing award lecture

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list still here?
by Brian E. Lavender 17 Dec '23

17 Dec '23

I tried upgrading, yet it had some issues! I ended up reverting to old image.... -- Brian Lavender http://www.brie.com/brian/ "There are two ways of constructing a software design. One way is to make it so simple that there are obviously no deficiencies. And the other way is to make it so complicated that there are no obvious deficiencies." Professor C. A. R. Hoare The 1980 Turing award lecture

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upgraded list server to Debian 12
by Brian E. Lavender 17 Dec '23

17 Dec '23

I am checking to see if it still works! Shotgun approach! I mirrored the image to a new server. I see that the mailing list allows a max message size of 40kb. I think we ought to figure out how to bost that a little bit! Brian -- Brian Lavender http://www.brie.com/brian/ "There are two ways of constructing a software design. One way is to make it so simple that there are obviously no deficiencies. And the other way is to make it so complicated that there are no obvious deficiencies." Professor C. A. R. Hoare The 1980 Turing award lecture

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Images on the web
by Sen Hastings 16 Dec '23

16 Dec '23

Just stumbled across this today: https://ist.uwaterloo.ca/~anderson/images/index.html It's a fascinating look at older practices of images on the web. I like this page especially: https://ist.uwaterloo.ca/~anderson/images/GIFvsJPEG/SameImageDiffSizes.html

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libcap
by Brian E. Lavender 07 Dec '23

07 Dec '23

I did not know! "Not needing root to administer Linux - the home of libcap" https://sites.google.com/site/fullycapable/ I discovered this while investigating the source for "C library for Broadcom BCM 2835" http://www.airspayce.com/mikem/bcm2835/ -- Brian Lavender http://www.brie.com/brian/ "There are two ways of constructing a software design. One way is to make it so simple that there are obviously no deficiencies. And the other way is to make it so complicated that there are no obvious deficiencies." Professor C. A. R. Hoare The 1980 Turing award lecture

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css
by Brian E. Lavender 06 Dec '23

06 Dec '23

Sen, Some questions on the new saclug site. https://github.com/brieweb/saclug.org/tree/master/theme/static/css I am not the CSS expert. It looks like the template now just uses saclug.css? It previously used nblug.css and normalize.css. What was your strategy here? Brian -- Brian Lavender http://www.brie.com/brian/ "There are two ways of constructing a software design. One way is to make it so simple that there are obviously no deficiencies. And the other way is to make it so complicated that there are no obvious deficiencies." Professor C. A. R. Hoare The 1980 Turing award lecture

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new meeting location
by Brian E. Lavender 04 Dec '23

04 Dec '23

We have a new meeting location! Bel Air Market #502 4320 Arden Way Sacramento, CA 95864 When: Tue December 19, 2023 06:00 PM to 08:00 PM Speaker: Brian E. Lavender (Me) raspi hat with a 3 axis acclerometer , gyro, and magnetometer. And go! Brian -- Brian Lavender http://www.brie.com/brian/ "There are two ways of constructing a software design. One way is to make it so simple that there are obviously no deficiencies. And the other way is to make it so complicated that there are no obvious deficiencies." Professor C. A. R. Hoare The 1980 Turing award lecture

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Proposed meetup venue: Bel Air #502
by Sen Hastings 04 Dec '23

04 Dec '23

Howdy Y'all, I just got back from a dry run using the "Something Extra Gather Room" at the Bel Air #502 on Arden and Eastern. The address is 4320 Arden Way, Sacramento, CA 95864 and the gmaps page is: https://maps.app.goo.gl/eBKZdheFGPSeDXFk7 I thought to do a dry run to sus out the AV setup and get a general lay of the land, suffice to say I am VERY impressed. The SEGR is located immediately inside to the left of the left most entrance, right in "THE TAPROOM" area. It's one of those rooms where the walls are made of partially frosted glass panels. Coffee, beer, desserts and charcuterie are available at the nearby counter,but you can also walk across the store and get something from the deli if you want something more meal shaped. Just remember to actually buy the food before you eat it. :p The AV setup is a BIG tv with a BIG soundbar attached. The power button for the TV is on the bottom edge in the center,so you have to wedge your fingies between the tv and the soundbar to get at it. Once the TV is on, some inputs can be switched and some sort of cable/broadcast tv box can be controlled via the Crestron tablet thing on top of the media cabinet. The pincode for the Crestron tablet is the store # twice, literally: "502502". HDMI in is on the right side of the media cabinet. If you really really want you can also plug into either HDMI 1 or DVI directly on the tv, but then you only get audio from the crappy TV speakers and not the nice sound bar. The store wifi *seemed* to be ok, measuring at ~100Mb symmetric, but then I had issues connecting to some ubuntu repos? I fell back to the wifi hotspot on my phone which also worked p well, which tells me the area has good T-Mobile coverage. From what I can gather the room isn't used much and the staff there seem pretty chill, so no ones gonna yell at us if we show up a little early and leave a little late. And the best part (aside from the beer) is that the 2hr booking cost $0. This is absolutely my vote for the December meeting, but let me know what y'all think. Shout out to Gary for the idea, I had *no idea* meeting rooms in Raley's were a thing. I'll send a follow up email with some photos/videos attached of the venue. Cheers, Sen-h.

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