HC-SR04 Ultrasonic sensor is a 4 pin module used in many applications where measuring distance or sensing objects are required. Check out this article to find more details about ultrasonic sensor like pinout, datasheet and technical specifications.
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Wiring up DHT11 Temp & Humidity sensor to the Arduino
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The DHT11 is chosen because it is lab calibrated, accurate and stable and its signal output is digital. Most important of all, it is relatively inexpensive for the given performance. Below is the pinout of the sensor.
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