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Made it thru the rain - drive safe!
by Sen Hastings 19 Dec '23

19 Dec '23

Hey yall, I made it to the meetup location in spite of the weather. Should have everything set up in a few mins. Sen-h.

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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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