Brainstorm for a high resolution, high speed, synchronous rpm sensor

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Great work!

 

Is there an advantage to rotating chip U2 45 degrees, or is it for cosmetics?  I see this done occasionally & wonder

When in the dark remember-the future looks brighter than ever.   I look forward to being able to predict the future!

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max_torque_2008 wrote:
... because the data all gets fed up into a super duper FPGA based controller from National Instruments that does all the heavy lifting.
Alorium Technology has a FPGA that emulates a mega328 and has multiple quadrature decoders that appear to meet your rpm requirement.

XLR8 Tachometer Demo: The Details - YouTube for approx 1m30s (tail of video)

via Quadrature - Xcelerator Block | Alorium Technology

due to Snō™ FPGA SoM - Alorium | DigiKey

 

board datasheets :

Sno_Product_Brief

XLR8_Product_Brief_Production

 

 

"Dare to be naïve." - Buckminster Fuller

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avrcandies wrote:
Is there an advantage to rotating chip U2 45 degrees, or is it for cosmetics?  I see this done occasionally & wonder

The picture in question seems to be gone, but this is often done for a real reason.

It makes the fanout of lots of traces from ICs easier.

Take for example the arduino nano board below.

if the M328 sides were parallel to the board then you would have to fan out a lot of pins in the narrow region between the chip and the 0.1" headers.

By rotating the chip all traces can be routed away to the sides.

Doing magic with a USD 7 Logic Analyser: https://www.avrfreaks.net/comment/2421756#comment-2421756

Bunch of old projects with AVR's: http://www.hoevendesign.com

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