Accelerometer Usage

[Phaedrux]

@tekstyle See here: https://duet3d.dozuki.com/Wiki/Accelerometers

Having the accelerometer is just the first step. You will need to do some test movements to get readings and then analyze them to determine which frequencies are needed to use with the input shaper.

[jbergene]

@tekstyle thats smart! i will try that

[oliof]

@phaedrux the documentation currently lacks the two crucial sentences, how to find out the dominant frequency of an axis ... but the InputShaping plugin will solve this eventually (-:

[jbergene]

@dc42

8937
c3H
0KK1F?

[CCS86]

@oliof said in Accelerometer Usage:

@phaedrux the documentation currently lacks the two crucial sentences, how to find out the dominant frequency of an axis ... but the InputShaping plugin will solve this eventually (-:

This feature is barely in beta form. You can't really expect comprehensive documentation at this point.

[oliof]

I am not expecting comprehensive documentation at this point. As I wrote I am looking forward to the eventual solution via the InputShaping plugin.

[tekstyle]

@phaedrux i have the accelerometer plugin. i was able to visual the graph for all 3 axis. i just dont know what to look for as the link provided isnt clear on how to interpret the data to figure out which hz to use. or i am just not understanding the content.

[Phaedrux]

@tekstyle No you're right. That part is coming and hopefully will be more automated by the plugin to suggest what it should tune out, among other things.

[tekstyle]

@phaedrux oh ok. i'll wait for that in the meantime. Thank you.

[o_lampe]

@jbergene
mine says "DSH" clearly, not sure what a DH should show? Anyone?

[oliof]

18.8.2021, 07:37:18 M955 P0
Accelerometer 0 type LIS3DH with orientation 20 samples at 1344Hz with 10-bit resolution, SPI frequency 2000000

[jbergene]

@o_lampe Yeah maybe ill just try the DSH that arrived yesterday. that one says
2304 - DSH - YP3HC"

Do you know the orientation of the purple LISD3DSH board? X Y Z
I cant find that information anywhere

[o_lampe]

@jbergene

According to this picture

• positive X goes to the right
• positive Y goes to the back
• positive Z goes up

[jbergene]

@o_lampe thank you:)

[tekkydave]

@gloomyandy I bought one from that seller. The board seems to indicate a LIS3DSH but the chip has 3CH on it which is a LIS3DH. Have you connected it up & what does the Duet report?

I bought two boards from different sellers. One should be a LIS3DH and the other a LIS3DSH. They look identical to me and both have 3CH on the chip.
The only difference is one has OED26 after the 3CH and the other OED27.
I have only connected the OED26 to the Duet so far.

They both look like this on the back:

I'm assuming that the Duet will report the correct chip.

Edit: I have soldered a connector to the other one (OED27) and tested it with the Duet. Also get same message as the other one

Accelerometer 0 type LIS3DH with orientation 14 samples at 1344Hz with 10-bit resolution, SPI frequency 2000000

Hmmmpphhh!

Edit:
Further tests connecting the device to an Arduino confirm it is a LIS3DH as it returns device id = 51 (0x33). So despite it being advertised as a LIS3DSH and the pcb indicating that it is - well it isn't. So be careful when buying these folks and check the code on the chip:
3CH = LIS3DH
DSH = LIS3DSH

I have ordered another one from the link given by @dc42 above. Let's see what turns up

[gloomyandy]

@tekkydave Mine is marked C3H OED27. Not had chance to try it yet.

[tekkydave]

@gloomyandy It is a LIS3DH then. I have just run some tests connecting one up to an Arduino. I can only get it to communicate using an LIS3DH library.

[gloomyandy]

@tekkydave Have just tested mine and RRF 3.4 seems to think it is a LIS3DH, which is a pain as I really wanted a LIS3DSH to test with (I look after the RRF STM32/LPC port). Oh well looks like I need to try and order from a different supplier.#

[tekkydave]

@gloomyandy

[Blacksheep99]

@tekkydave said in Accelerometer Usage:

@gloomyandy I bought one from that seller. The board seems to indicate a LIS3DSH but the chip has 3CH on it which is a LIS3DH. Have you connected it up & what does the Duet report?

I bought two boards from different sellers. One should be a LIS3DH and the other a LIS3DSH. They look identical to me and both have 3CH on the chip.
The only difference is one has OED26 after the 3CH and the other OED27.
I have only connected the OED26 to the Duet so far.

They both look like this on the back:

I'm assuming that the Duet will report the correct chip.

Edit: I have soldered a connector to the other one (OED27) and tested it with the Duet. Also get same message as the other one

Accelerometer 0 type LIS3DH with orientation 14 samples at 1344Hz with 10-bit resolution, SPI frequency 2000000

Hmmmpphhh!

Edit:
Further tests connecting the device to an Arduino confirm it is a LIS3DH as it returns device id = 51 (0x33). So despite it being advertised as a LIS3DSH and the pcb indicating that it is - well it isn't. So be careful when buying these folks and check the code on the chip:
3CH = LIS3DH
DSH = LIS3DSH

I have ordered another one from the link given by @dc42 above. Let's see what turns up

I ordered one from the seller DC42 linked to and this is what I received.

[tekkydave]

@blacksheep99 should be a LIS3DSH from the chip id of DSH.

[tecno]

Got my 2 today from UK and they show up as:

M955 P0 C"io3.out+io3.in"
Accelerometer 0:0 type LIS3DSH with orientation 20 samples at 1600Hz with 16-bit resolution, SPI frequency 2000000

So what do I need to do next to get started? I have one for X and Z and the other for Y only.

[jay_s_uk]

@tecno if you have a bedslinger, then yes.
and then use the input shaper plugin to record the results

[tecno]

@jay_s_uk

Yes its my good old Chiron

Will try to see what I get here.

[tecno]

Re ORIENTATION

As i see this is orientation I20, right?

If I flip the board so VCC will be to the right upside down is the orientation then I60 ?

How do handle this in config.g ? 2 lines ?

M955 P0 I20 C"io3.out+io3.in" ;active
;M955 P0 I60 C"io3.out+io3.in" ; not active