The microprocessor was fast enough that this scan cycle did not flicker noticeably when supporting the twelve digits in the display. In the previous three-display project, I chose to drive the digits one at a time, lighting up the entire number, extinguishing it, and then moving to the next number, and repeatedly scanning the display. But, I only had one of those backpacks on hand, so for this project, I had to drive the displays directly. Since then, I did a project that used one of those backpacks, and I have to admit that it was very convenient and shaved off a ton of both wiring and code. For that project, I whined about how I didn’t want to spend $6 per display to add I2C backpacks. I went with those.Ī while back, I had mentioned another project that involved three of these displays. On the other hand, I have a bunch of 4-digit x 7-segment LED displays that burn as bright as Sauron atop Barad-dûr. However, the only LCDs I have on hand have small fonts and aren’t that bright. The fast, reasonable approach would be to wire up a microprocessor, a real-time clock chip, and an I2C-driven LCD display that could show all three zones at once. The time in UTC is displayed on my computer when I’m logging, but it’s small and it disappears when the screen sleeps. Also, I use the same room to take work-related conference calls, and it would be helpful to have a clock that displays the local time in Madagascar and the time on the US East Coast, where most of my overseas calls are scheduled. I’ve been meaning to add a clock with multiple time zone display to my radio operating position for a while.
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