This water-proof sensor can detect if there's an object within its range using infrared light. The range is configurable up to 2 meters and the sensor is waterproof. Ideal use cases: checking if your car is in the garage, cheaking if there are letters in your mailbox, … Buy this sensor from DFRobot:
https://www.dfrobot.com/product-1653.html?tracking=6099f25f89161
(They kindly provided me with this sensor) ⚡️Other videos in this series:

(Everything you need to know about programming the ESP32 by using the Arduino Framework) 🌍 Social
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The web community is entering into a new era of responsive design and shifting our perspectives on what it means. With user preference queries, container queries, and other form-factor queries on the horizon, we'll soon have the tools to create responsive designs far beyond what querying the global viewport allows. This Session highlights what it means to be responsive to the user, container, and form-factor, along with how to implement some of these new axes of responsive design. Speaker: Una Kravets PUBLICATION PERMISSIONS:
Original video was published with the Creative Commons Attribution license (reuse allowed). Link: https://www.youtube.com/watch?v=jUQ2-C5ZNRc https://www.youtube.com/watch?v=vAsgSwlN93I

Battery-powered IoT projects require you to monitor your battery's percentage. Measuring battery voltage is not ideal, because the voltage doesn't drop linearly. Fuel gauges are a better alternative. They work straight away, don't consume power while in standby, and they're accurate without any calibration! Buy a Battery Fuel Gauge from DFRobot:
https://www.dfrobot.com/product-1734.html?tracking=6099f25f89161
(They kindly provided me with this sensor) ⚡️Other videos in this series:

(Everything you need to know about programming the ESP32 by using the Arduino Framework) 🌍 Social
Twitter: https://twitter.com/Savjee
Facebook: https://facebook.com/Savjee
Blog: https://savjee.be ❤️ Become a Simply Explained member: https://www.youtube.com/channel/UCnxrdFPXJMeHru_b4Q_vTPQ/join 💌 Newsletter: http://newsletter.savjee.be (no more than once a month) https://www.youtube.com/watch?v=mhmD-QA6kf0