[chbot] Robotics Group meeting, Monday 20 July 2020, 630pm, 5 Idris Road (magnetic encoder details)

[David Closey]

For those interested in the detail of the magnetic strip encoder circuit 

The circuit uses austria microsystems   AS5311 linear sensor            https://ams.com/as5311
and the LS 7366R 32 bit quadrature counter IC         https://lsicsi.com/datasheets/LS7366R.pdf

then I am currently using an ATmega328 to request or reset count from the LS7366R via SPI 


Peter Cabelo at auckland uni has built several systems using these IC’s 
check out his blog for his great write ups      https://pcm52.com


I have redesigned the pcb and code but essentially have followed his lead using the two IC’s together 
I’m happy to share with anyone interested 

David Closey 



> On 20/07/2020, at 22:02, Mark Atherton <markaren1 at xtra.co.nz> wrote:
> 
> Hello everyone,
> 
> Several new faces this evening; welcome.
> 
> Good turnout with 20 attendees, and lots of huddles-of tech-talk. $24 + change (in gold, and flat-money) collected and transferred into the robotics loose-change jar (for later banking).
> 
> Quick reminder: equipment donations are welcome for the trading table, but no CRT based product, printers, toner or items that are likely to be a disposal burden. All sales from the trading table should go into the brown box on the wall, and are directly for the benefit of our host club, NZART Branch 05.
> 
> With thanks on behalf of the group,
> 
> Mark Atherton
> 
> ============
> 
> William showed off the latest enhancements to the huge 7-segment display project. Each 7-segment display is roughly A5 size, and quite bright. PWM brightness now implemented with input control from a pot and ADC.
> 
> David Bourke talked about his home-made rocket project, as well as associated adventures. Quite a learning experience for all concerned, and significant progress has been made. Great presentation with photos and videos.
> 
> Andy talked about his latest adventures running CodeBreakers in Christchurch (formerly The Crate Escape). Lots of development making the next generation of escape rooms, and puzzles. Also discussed various VR development environments including Unity, and GDevelop.
> 
> David Closey (new member) gave us an interesting talk about instrumenting a 1970s manual mill, in preparation for automation. Technique involved attaching a magnetically encoded strip to each axis, and displaying displacement on a suitably large and readable display.
> 
> Henry Allison talked about the upcoming meeting of Aerospace-Christchurch tomorrow. See the web for further details. He also mentioned an open source CNC mill project he has been following.
> 
> 
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