Returns accepted within 3 days, only for damaged or wrong products. We offer returns Free of Cost for size issues and damaged or wrong products. Returns will be offered in the form of product exchange or cash refund when exchange is not possible. Returns can be initiated either from your Kaymu Account or by calling our Customer Service Team at 9801 292929.
Ultrasonic ranging module HC-SR04 provides 2cm - 400cm non-contact measurement function, the ranging accuracy can reach to 3mm. The modules includes ultrasonic transmitter, receiver and control circuit The basic principle of work - Using IO trigger for at least 10us high level signal - The Module automatically sends eight 40 kHz and detect whether there is a pulse signal back - If the signal is back, through high level, time of high output I/O duration is the time from sending ultrasonic to returning. Test distance=(high level time x velocity of sound (340m/s) /2.