Lidar data reading from Node-Red

General
1

Is there any Node-red palette to decode and read Lidar sensor data directly?

2

Have you searched on flows.nodered.org?

I suspect it will depend on the specific device you are using and what interfaces it provides.

3

thanks tor the reply. yes but didnt find anything yet.
I need some palette to decode those huge hex data to simple distance values.

4

Is there a node.js package that you could use to get started?

5

you might look at using a WeMos with the Lidar connected to it and something like espeasy to communicate between the WeMos and NR

6

Thanks for the replies. I will consider each solutions. Seems like no direct palette for this job to be done.

7

I did this with my Botvac once, but it just dumped basically an array of 365 distance values. Then I just built an SVG that plotted all of those distances out from a central point to get a basic shape... but it didn't really work well. To get a good map, you really needed positioning information in addition to the LIDAR to orient the points, as well as do elimination of sensor errors or you just get sort of a spikey ball shape...

i.e., actual interpreting the LIDAR data can give you a basic image, but the real work of getting a good map out of that is a lot more involved.

1 Like
8

I'm using this python library https://github.com/pimoroni/VL53L0X-python invoked by an EXEC node.

I personally use a VL53L0X2 chip with really good results.

9

I've used the TCP IN node once to get Lidar data and it quickly made NodeRed unresponsive. You'll have to use Thread Workers to do the number crunching separately and design a way to report the results to a NodeRed node.

10

This topic was automatically closed 60 days after the last reply. New replies are no longer allowed.