Close

SF30-b first plug-in

A project log for Open LIDAR

This project is to build a motorized gimbal mount to convert a laser distance module into a 3d LIDAR.

caveradamcaver.adam 09/09/2016 at 00:280 Comments

Had a few minutes tonight so I plugged my brand new SF30-B into my USB port and grabbed some data. Ran out of time before I could plug it into my project (which doesn't matter much because I can't get this Bluetooth module to run at more than 9600 baud without a USB to TTL cable). So I ran a couple quick checks of the sensor data using excel.

I still need to test whether this thing is really temperature sensitive. It looks like it is because my values at the start of the test were in the 0.26m range, but at the end of the testing they clustered higher. This seemed to happen for both modes. Also, when I first turned the module on I had some REALLY low values, but that was first time turning on. More work needed on determining a warm-up period.

The smoothed mode does a really good job with the laser and a stationary target. I'm guessing that this mode may cause problems on a LIDAR though. Time will tell. There is much more variation in the 0.03 resolution mode. If I used this mode I will need to see if different data rates have an impact. Otherwise I'll have to throw a digital filter on this. A range of 3cm I can handle. A range of 12cm is too much.

Smoothed:

Distance
Mean 0.275254
Standard Error 2.36E-05
Median 0.28
Mode 0.28
Standard Deviation 0.005087
Sample Variance 2.59E-05
Kurtosis -1.72543
Skewness -0.01761
Range 0.03
Minimum 0.26
Maximum 0.29
Sum 12745.37
Count 46304

0.03 resolution:

Distance
Mean 0.277086597
Standard Error 2.96305E-05
Median 0.28
Mode 0.28
Standard Deviation 0.012201442
Sample Variance 0.000148875
Kurtosis 1.125499347
Skewness -0.595383425
Range 0.12
Minimum 0.21
Maximum 0.33
Sum 46985.02
Count 169568

This weekend I need to connect this through my arduino to verify my wiring. Hoping to get a circuit board designed over the weeked if I can get my brother moved quickly enough.

Discussions