automatic usb Tea timer
thingiverse
This is an automatic USB timer for under 4 dollars. If, like me, you are fed up with forgetting to drink your coffee when you're on your computer, put your cup on the timer and it will start automatically and flash after a certain amount of time (infrared sensor). There are five LEDs inside. Every minute, one LED lights up, and at the end, all the LEDs flash. The Fritzing circuit diagram and Arduino code (sketch_IR_led_emit.ino) are provided. Arduino Nano 5 LEDs 1 IR LED emitter and 1 IR receiver (similar to this) https://www.aliexpress.com/item/Smart-Electronics-5mm-940nm-LEDs-infrared-emitter-and-IR-receiver-diode-10pairs-diodes-301A/32574032076.html?spm=a2g0s.9042311.0.0.27424c4dTB1H1x 1 100-ohm resistor 1 approximately 50k-ohm resistor Less than 4 dollars
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