2017 Newsletter: 12/73 — PreviousNext — (Attach.)

Panorama across harbour of Sydney CBD
WEEKLY NEWSLETTER 13 - 18 February 2017

Hello and Welcome,

Meetings for This Week:

Programming - Tuesday 14th Feb - 5:30 pm - 8:00 pm

Come and show your projects, and see some others. We have a computer with a projector, so bring along picture files of your project and we'll project them on the wall. We have a broadband internet connection, so discussion can be wide ranging.

The next meeting will be on Tuesday February 14 at 6pm. We'll see some new microprocessor applications and programming examples.

Past meetings:


At the January meeting we were told of Einstein's description of telegraphy and radio. Telegraphy is like a very long cat. You squeeze its tail in New York and it meows in Los Angeles. Radio is just the same, except there is no cat.

Alex showed a mini stereo amplifier he built using a stamp-sized board with a 3 watt chip called the PAM8403. These are available on eBay for $1 and run off 5 volts. There is a slightly larger module which uses the 10 watt PAM8610 chip. He hooked it up between his computer and some speakers and achieved high-quality sound reproduction.

Andrew discussed 8 bit PIC16 chips that contain new peripherals, such as a 10 bit analog-to-digital converter which can do averaging and filtering functions while the CPU is in the Sleep state. The most capable of these chips is the PIC16LF18877, which has a flat program memory space of up to 56 KB and up to 4K of SRAM, extending the scope of the PIC16 family into new areas. To assist with designing systems using the various peripherals Microchip now offer MPLAB-MINDI, a circuit simulator for both analogue and switched circuits. At a future meeting this will be demonstrated in action.

Web Design - Saturday 18th Feb - 1:30 pm - 4:00 pm

Last month we saw how we can make practical use of the W3 CSS. There are numerous templates and we looked at a case study creating a responsive site within the W3 site tutorial.

We showed a small site made by doing a bit of mix and match of elements from various templates and we looked at how that worked.

This time, we will continue on these lines, with more CSS topics.

Some of us have noticed that current modern websites don't necessarily show the "destination pages" we've been told to monitor. The "status" line usually displays the URL that the next click will take us.

The techradar.com site, describing the BBC micro:bit, a small credit-card-sized microcomputer, has a starting page:


It is an interesting sequence of 11 pages (you have to click NEXT, NEXT etc.), but they ALL appear to have the same URL. What's more, you never see a destination page on the status line at the bottom of any of the 11 pages.

  1. How do they do this?
  2. Are they deliberately trying to hide the mechanics of the style, and so "dumbing-down" the present audience?

Interesting questions.

Meetings next Week:

Tuesday Group - Tuesday 21st Feb - 9:30 am - 12 noon
Family History - Tuesday 21st Feb - 1:00 pm - 3:00 pm
Digital Photography - Friday 24th Feb - 9:30 am - 12 noon

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Bob Backstrom
~ Newsletter Editor ~

Information for Members and Visitors:

All Meetings, unless specifically stated above, are held on the
1st Floor, Sydney Mechanics' School of Arts, 280 Pitt Street, Sydney.
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