Frequently Asked Questions

SRF10 72° SRF01/02 55°
Q. What are the units on the vertical axis in the beam pattern diagram?
A. Units are dB, taken from the manufacturers data sheet at: http://www.robot-
electronics.co.uk/datasheets/t400s16.pdf
Q. What distance above the floor should the sonar be mounted?
A. If you can mount the SRF04/8 12in/300mm above the floor, that should be OK. If you
mount them lower, you may need to point them upwards slightly to avoid reflections
from the carpet pile or ridges in a concrete floor.
Q. Can we replace the transducers with sealed weatherproof types?
A. No. We have tried these on both the SRF04 and SRF08 and they do not work. The
characteristics of the sealed devices requires a new design which is on our future plans
list.
Q. What is the RH limit for the transducers?
A. This is not specified by the transducer manufacturers and is not listed in the data sheet.
The following is the manufacturers response to an email "The RH here in Taiwan is
normally higher than 95%. Just if this sensor(400ST/R160) is used in the air, it should be
okay. Don’t use in outdoors. Exposing in rainy day or underwater is not allowed."
Q. Is there a need for us to change the SRF08/SRF10 address when using the sensor,
can't I just use the default address?
A. Yes, if you only have one sensor you can use the default shipped address of 0xE0.
You only need to set addresses if you are using more than one SRF08/SRF10 on the same
I2C bus.
Q. Can I fire two or more sonar's at the same time?
A. No! If two or more sonar's are fired together then they could pick up each other