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countdown-timer

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View BlastOff project

archadious / kits / BlastOff

USB‑C, hand‑solder countdown toy — an ATtiny84 drives a single 7‑segment digit and a piezo buzzer through a rocket‑launch countdown.

kicad pcb-design open-hardware electronics diy-electronics hobby-electr... avr microcontroller piezo-buzzer usb-c through-hole led desk-toy electronic-kit solder-kit attiny84 seven-segmen... countdown-timer rocket

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Updated Oct 01, 2026

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Updated Oct 01, 2026