The hardware setup shown below includes the Arduino Uno R4, a DHT11 sensor, and the built-in Wi-Fi for email alerts. The DHT11 is connected with VCC to 5V, GND to ground, and the data pin to Digital ...
Motion sensors are great for turning on lights when you enter a room, but they're pretty bad at knowing how long to keep them on if people are sitting still. Presence sensors are a great solution, as ...
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