Even when we clean, because of laziness or lack of time, we often throw all waste into the same bin without separating ...
The build: → ELEGOO UNO R3 → Arduino IDE for the firmware → Optical pulse sensor reading PPG (Photoplethysmography) off a fingertip → 16x2 LCD (I2C) to show live BPM → LEDs to indicate safe vs. unsafe ...
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