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As the propagation speed of the Ultrasonic wave (330 m/s in room condition) and time taken by the wave are known
It can be used either as a voltage mode or current mode controller
Stable touching detection of human body for replacing traditional direct switch key
To improve the range of the receiver wire/antenna can be soldered to the antenna port of the module
6V DC Motor is suitable for making an Electric screwdriver
A7840 IC-Isolation Amplifier SOP-8 Package 546 Oval Red LED(300-400mcd) As the propagation speed ofThe Isolation Amplifier IC A7840 is intended for use in electronic motor drives to sense current. The A7840 detects the analogue voltage drop that results from motor currents flowing through an external resistor in a typical design. On the other side of the optical isolation barrier made by the A7840, a differential output voltage is produced. An op amp can be used to transform this differential output voltage, which is proportional to the motor