Kevin McClaning will provide an introduction to radio frequency theory at the June online 7-9pm EDT meeting. Remaining details and slides for the talk soonest.

Kevin McClaning has a master’s degree in electrical engineering from the Johns Hopkins University (JHU). He spent 34+ years performing technical design tasks for the US Department of Defense, and another three years at various contractor facilities. He also spent 10 years teaching master’s degree-level courses at JHU. He is the co-author of Radio Receiver Design , published in 2000 (ISBN 1-884932-07-X) and the sole author of Wireless Receiver Design for Digital Communications, published in 2012 (ISBN978-1-891121-80-7).

We will meet via Jitsi at 7pm on Monday, March 8th. Jitsi works best with the Firefox web browser.

The online meeting URL is in a recent posting available in the email archive on this page .

Agenda:

– Welcome

– Announcements

– P.O.T.M. (Problem of the Month)

– CROTM (Code Review of the Month)

                Modules for Python – Carl Nobile

– Show and tell (open to all to share with the group)

Paul will show an LTE HAT for Pi Zero talking to the Internet in a remote setting

We will meet via Jitsi at 7pm on Monday, February 8th. Jitsi works best with the Firefox web browser.

The online meeting URL is in a recent posting available in the email archive on this page .

Agenda:

– Welcome

– Announcements

– P.O.T.M. (Problem of the Month)

– Presentation

                Circuit Review of Voltage Controlled PWM – Carl Nobile

– Show and tell

(Notes by Paul MacDougal with some light editing by Pete and Jenny Soper. A volunteer for February notes is needed.)

Problem Of The Month (P.O.T.M.) 
   
Paul MacDougal reviewed  his long history of making some kind of puzzle to give to his nieces. A last minute flash of inspiration resulted in a maze in which two "pointers" following identical mazes were modified to be two "pointers" following different mazes. This requires the pointers to be able to move relative to one another. Controlling this movement and creating  compatible mazes induced development of software for creating and manipulating mazes. The "problem" this month was to suggest new features for this maze software.

Code Review Of The Month (C.R.O.T.M.)
 
Carl converted Paul's short python script to a class-based implementation. There was some discussion of Paul doing a sys.exit(x) from within a script that is running separate threads and how that might mess up. "FOO" vs "foo" vs "_foo" vs "__foo" conventions in Python. (And let's not forget "Foo"!) 

Presentation:  ESP8266 OTA by Paul MacDougal

ESP8266 supplier Espressive has done all the hard work to use Over The Air firmware/data update (OTA) in its libraries. Paul showed a simple sketch to do OTA from the Arduino IDE which is just running a python script. Multicast DNS (mDNS) is used for identifying development boards via name rather than IP address. A simple sketch to do OTA by connecting to a device using HTTP was shown. There was discussion of using ports 80 vs 8080 (really < 1024 vs > 1023). A simple sketch to do OTA by device accessing a server at a known IP address was shown and there was discussion of security (or lack thereof) of OTA programming. 

We will meet via Jitsi at 7pm on Monday, January 11th. Jitsi works best with the Firefox web browser.

The online meeting URL is in a recent posting available in the email archive on this page .

Agenda:

– Welcome

– Announcements

– P.O.T.M. (Problem Of The Month)

                – C.R.O.T.M. (Code Review Of The Month)

– Presentation

                OTA (Over The Air) programming of ESP8266 board – Paul MacDougal

– Show and tell

NC State, Centennial Campus Engineering Building One, Room 1007, 911 Partners Way, Raleigh, NC 27606 (same as IEEE/robotics/TAR meetings through May) Monday, Jan 13, 7-9PM. A map for finding the meeting and additional details here: https://triembed.org/meetings/at-ncsu/

Agenda:

Announcements 

Problem of the Month: Paul MacDougal

Presentation: Charles Lord, an area embedded development professional and expert instructor, will go over RTOS fundamentals as well as providing heuristics and guidelines to help answer the question of how much "real time behavior" you need. (Charles will be giving a presentation in February too: stay tuned for details)

Show and Tell and general discussion: Including examples of two new OSH Park PCB service offerings to be passed around for close inspection: do it yourself, pro quality flexible PCBs and clear solder mask over ENIG traces on a black substrate (so cool you should bring your shades to look at it!) Also, you can see their latest improvement over the old "mouse bite" tab routing that is being delivered more and more often. 

Door prize giveaways: Protocol highly variable!
 
(Prospective donations for the giveaway box always welcome!)

Image copied without permission from https://www.computerhope.com/jargon/r/realsyst.htm

LoRaWAN™ – a Low Power Wide Area Network (LPWAN) specification intended for wireless battery-operated Things in a regional, national or global network. Join us as Charles Lord reviews the elements of LoRa and LoRaWAN, the advantages (and disadvantages) of this protocol, and the tools we need to develop IoT solutions that use LoRa – including building your own LoRaWAN hub. Charles will do a demo and show some examples of ways to build your own LoRa network for fun or commercial use. We will also look at how we can build our own LoRaWAN gateway using an inexpensive kit for both development and for deployment where a local LoRa provider doesn’t exist – and how to interface where we do have providers – like in the Triangle!

Charles J. Lord, PE is an embedded systems consultant and trainer with over 40 years’ experience in system design and development in medical, military, and industrial applications. For the last twelve years, he has specialized in the integration of communication protocols into clients’ products, including USB, Ethernet, and low-power wireless including ZigBee, 6LoWPAN, LoRa, and Thread.

Meeting Details here.

Image from Cisco’s LoRaWAN datasheet.