Ultrasonic Distance Unit (RCWL-9600)

UT2UH

Hello!
Does anybody know what speed of sound (or rather speed of sound at what temperature) is used by Ultrasonic Distance Unit (RCWL-9600) to calculate the distance? May be somebody can translate the following notice on that from Chinese?

antimix

Hello,
the RCWL-9600 is very accurate.
You may read the data using a simple function like this:

#define M5_I2C_ADDR_ULTRA 0x57

float ReadI2CDistance()
{
uint32_t data;

Wire.beginTransmission(M5_I2C_ADDR_ULTRA);
Wire.write(0x01);
Wire.endTransmission();
delay(120);
Wire.requestFrom(M5_I2C_ADDR_ULTRA,3);
data  = Wire.read();data <<= 8;
data |= Wire.read();data <<= 8;
data |= Wire.read();
return float(data) / 10000;  // distance in cm

}