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Electronic part organizer - 3d printed
Easy ultrasonic 4-pin sensor monitoring (hc-sr04)
Pocket fan (for hot summer days)
I built the hc-sr04 version, but modified it to use float data type for the variables inches and cm. Then changed microsecondsToInches and Centimeters to return a float and to divide by 74.0 instead of 74 or 29.0 instead of 29 - this causes a floating divide instead of a integer divide.
Wake-up light (no arduino)
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