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Assemble the General Purpose Alarm Device (GPAD)

An Arduino-compatible alarm box with five bright LEDs, an 85 dB buzzer, a 20 × 4 LCD and a mute button, commanded by a host over SPI or… · 2 parts · 5 steps · By Public Invention (Robert L. Read…

Gather the parts
Prepare the board
Fit the LCD and through-hole parts
Test before programming
Load bootloader and firmware

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