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Whereas the vacations are coming to an in depth, there’s at all times time to design festive ornaments pushed by low cost microcontrollers, which is what engineer Adam Zeloof did along with his Large Ben duplicate and double-decker bus.
“I suppose residing in London has actually gotten to me, as a result of this 12 months I made a decision to go a bit loopy with my annual PCB ornaments and design two: a reverse-lit double-decker bus and a tiny Large Ben, full with E-Paper show as a result of Christmas timber clearly want clocks,” Zeloof famous his Twitter feed.
Zeloof designed Large Ben round an ATmega328P microcontroller, which coordinates a real-time clock, RAM, and an ePaper show. The clock makes use of an Arduino sketch and requires the Waveshare EPD library and RTClib, whereas the clock face is a bitmap (saved in reminiscence) and the palms are dynamically drawn with traces and circles.
In the meantime, Zeloof’s double-decker bus is outfitted with an ATtiny85 that drives 12 Charlieplexed reverse-mounted LEDs. Though solely 4 pins are used on the microcontroller, every LED continues to be individually addressable. The decoration can also be outfitted with a push-button for switching between totally different lighting modes and is powered by a pair of CR2025 batteries that feed a 3.3 V buck converter. Zeloof admits there’s a difficulty with the bus, stating that it shouldn’t energy the PCB when programming, as it is going to instantly fry the converter. To mitigate the difficulty, Zeloof lower the VCC hint to the ICSP and linked that pin to the unused pin of the ability swap by way of a bodged wire.
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