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It turns out your Arduino can see, and hear, and feel–it just needs sensors to let it know what’s happening. In Part Five, you'll learn how to connect and program five sensors.
Part V. EXAMINING SENSORS
5.1. Hooking Up an Accelerometer
5.2. Using a Color Sensor to Gather Data
5.3. Measuring Temperature and Humidity
5.4. Connecting a Hall Effect Sensor
5.5. Setting Up an Infrared Sensor