Hi, I am using Ma405s , Ma405r (Transmitter and Receiver) in my project. The specifications are: description: ultrasonic sensor transducer - receiver max. input voltage: 20Vrms operating temperature: -4°F to +185°F range: 0.6 to 20ft nominal frequency: 40kHz sensitivity: -67dB min. sound pres…

Ultrasonic distance meter using arduino

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