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HC-SR04 Ultrasonic Module User Guide
Hc sr04 ultrasonic distance sensor can be used to measure the distance by detecting ultrasonic rays. Get hc sr04 ultrasonic distance sensor at ELECFREAKS.
Tips for Choosing the Best Bluetooth Shield for Arduino Project
What is the Bluetooth Shield for Arduino? The Bluetooth Shield for Arduino is an add-on board with Bluetooth wireless capabilities. It allows the Arduino board to transfer data to and from other Bluetooth-enabled devices such as smartphones, computers, etc., making it easy to connect circuits. Your Arduino to the Bluetooth World.