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Non-blocking Ultrasonic Sensor for Arduino
Thank you for making this instructable, finally a simple and coherent way of using interrupts with hc_sr04. Implemented it instantly in my old line follower code which uses I2C pins for analogRead().
Totally love it :)
The way you use hot-glue is incredible. I have just added some multicoloured leds and it looks fabulous in dark.
For example from herehttps://www.banggood.com/5pcs-Translucence-Hot-Mel...and they are pretty cheap almost anywhere.Depends on the country where you live in but they often sell them is shops dedicated for building equipment, rc model shops, stationery store or anywhere online (amazon, ebay, aliexpres, banggood, dx)From my experience it is easy to find them for reasonable price :)
Crystal Clusters / Geodes From Hot Glue Sticks
Solar USB Charger