29 Jul '12, 1pm

これすごい。クロックとデータを1線で制御する方法。クロックはそのまま、データはCRを挟んで繋いで、(立ち上がりで取り込みなら)クロックを立ち上げる前に長くLowにしておくとLが取り込まれて短いとH。

It’s almost a corollary to Moore’s Law: Next year, microcomputers will have more features, and the software team will have bigger ideas. Unfortunately, though, the number of output pins will stay the same. Finding even one spare output for diagnostics, test, or even standard I/O can be a tussle. The single-pin “bus” in Figure 1 can provide an unlimited number of parallel outputs with simple additional hardware. A microcomputer output with an RC lowpass filter controls serial-to-parallel converter HC164. To enter data into the serial-to-parallel converter, each bit consists of a one-to-zero-to-one transition, which alters the length of the low state. If the low state is longer than the lowpass filter’s time constant, a zero shifts into the register. If the low state is short, then a one shifts into the register. The clock and data signals thus combine into one signal. A low...

Full article: http://www.edn.com/design/analog/4316898/RC-lowpass-filte...

Tweets

@Freedom4Msian: Who owns port dredging concession?

anilnetto.com 28 Jul '12, 7am

Who really owns Inai Kiara Sdn Bhd? How did IMW become the only company approved to carry out dredging work in all ports u...

Stainless Steel Coffee Filter Is Reusable for Life

Stainless Steel Coffee Filter Is Reusable for Life

treehugger.com 29 Jul '12, 9am

Nate Jones /Video screen capture I just learned about the AeroPress coffee maker, but I like what I see. It's electricity-...

Who Owns Port Dredging Concession?: From Dredgi...

anwaribrahimblog.com 30 Jul '12, 10am

Dredging of a ports is big business and can cost hundreds of millions of ringgit. Do you know who has the concession to dr...

@fogus This old crufty thing probably doesn't r...

chadfowler.com 30 Jul '12, 3pm

#!/usr/bin/env ruby # I'm calling this "Poor Man's Seaside" for now. # The real Seaside is at http://beat4.com/seaside2. #...

@singlecoffee up with a blog post on the new S Filter on Kickstarter. Check it out here:

@singlecoffee up with a blog post on the new S ...

singleservecoffee.com 26 Jul '12, 12pm

Great question. We think the S Filter is a stronger design solution on a number of fronts: 1. It's a finer filter. Our fil...