I’ve bought a SEN136B5B Ultrasonic Range Measurement Module. Unfortunately I bought it from a distributor. Had I bought it directly from SeedStudios I would be already sending it back and asking for a refund.
The only thing it seems to detect with reasonable reliability within the range given in the specifications (400 cm!!!) seems to be A WALL.
For objects like chairs and PERSONS, it is almost acceptably reliable only below 40 cm, meaning that an adult standing right in front of the sensor at a distance above 40cm (the sensor being at the height of the belly) will be detected only half of the time. At distances greater than 80cm-1m a person will always never be detected. To have it detected and ranged most of the time (i.e. reliably) it must be within about 20cm. This is about 1/10 - 1/20 of the range in the specifications.
I guess the trick is in the fact the specifications don’t say how big an object needs to be to be detected at 400cm.
So, my question is, if it is not suitable for detecting something like a person, what exactly is it designed or supposed to be used for? Detecting MOVING WALLS? Whales? Trucks?
I am curious to hear experiences of anybody SUCCESFULLY using this sensor, and what they used it for.
Or what would be the conditions necessary to obtain decent results at reasonable distances for detecting people? (by reasonable distances I mean at least a couple of meters)
By the way I tried this other sensor: maxbotix.com/documents/MB1000_Datasheet.pdf and it works way, way better. (A person standing in front of the sensor is ranged with almost perfect reliability within about 2m, and I haven’t tried more)