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Controller for a Cifra 5 (Digit5) Flip Clock

In this article, I discuss making a synchronization circuit for the antique “Cifra 5” (Digit5) flip clock model, so that remote “receiver” clocks work even when disconnected from a central “signaler” clock and two-wire bus.

ZX Spectrum Next Issue 2 ships out, chip shortages be damned

ZX Spectrum Next Issue 2 ships out, chip shortages be damned
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Bicycle Light Using ANT+ Protocol - Circuit Cellar

ANT+ is a wireless protocol used in sports devices. I use this technology, along with Nordic Semiconductor’s nRF52832 microcontroller (MCU), to build a bicycle tail light. The light is activated by a Garmin GPSMAP 64st navigator, with its existing integrated features repurposed.

The game changer

The game changer Philip Oliver still remembers the day in 1981 when his world changed. He and his twin brother, Andrew, were 13 when their older brother arrived at their home in Trowbridge, Wiltshire, with a brand-new Sinclair ZX81. “It was like he’d arrived with a portal into a different world,” remembers Philip, who was fascinated at the […]

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