Accelerometer Usage

Ducati87

@ducati87 I mean connect the resistor between the SDO pin of the accelerometer board and the wire that goes to MISO on the Duet, instead of connecting the wire directly to the SDO pin.

in spite of the 1K resistor, the accelerometer is not found. I checked the cable on my duet daughter board and everything seems to be ok. Any suggest? Thank you.

dc42

@ducati87 thanks for trying. I've no more suggestion yet, but I will get back to this when I have time. What sort of cable are you using, and how long is it? Photos of the two ends please.

MikeS

@dc42 i'm in the same situation as @Ducati87 . Here's the thread where i have asked for help and post a photo of the wiring https://forum.duet3d.com/topic/24099/accelerometer-on-duet2wifi-duex5-expansion/3

CCS86

Same boat here.

M955 P0 >>>> "Accelerometer not found"

M955 P0 C"exp.pa22+exp.pa21" >>>> "Accelerometer not found on specified port"

Running RRF3.3 Stable
Wired with a VGA cable. I could probably take about 12" out of the cable length. I left it longer to keep the second ferrite noise filter in place.

dc42

@ccs86 I can't see anything wrong with the wiring or configuration command; so I guess it's an issue of cable length. How long is the cable? A 900mm long multicore cable is working OK for me on a Duet WiFi.

Have you tried temporarily unplugging the PT100 daughter board?

CCS86

@dc42 said in Accelerometer Usage:

@ccs86 I can't see anything wrong with the wiring or configuration command; so I guess it's an issue of cable length. How long is the cable? A 900mm long multicore cable is working OK for me on a Duet WiFi.

Have you tried temporarily unplugging the PT100 daughter board?

I just tried unplugging the daughterboard and still not finding the accelerometer.

I may try re-wiring with a CAT6 cable, if there aren't any other easier steps to take.

Phaedrux

@ccs86 Are you using a Maestro board?

CCS86

@phaedrux said in Accelerometer Usage:

@ccs86 Are you using a Maestro board?

Yes.

Phaedrux

@ccs86 said in Accelerometer Usage:

@phaedrux said in Accelerometer Usage:

@ccs86 Are you using a Maestro board?

Yes.

The lack of floating point unit makes accelerometer usage problematic. I didn't even think there was a build for the Maestro.

dc42

@ccs86 when we are happy with the performance of input shaping on boards that have floating point hardware, we will look at the feasibility of doing a build for the Maestro.

CCS86

@phaedrux said in Accelerometer Usage:

@ccs86 said in Accelerometer Usage:

@phaedrux said in Accelerometer Usage:

@ccs86 Are you using a Maestro board?

Yes.

The lack of floating point unit makes accelerometer usage problematic. I didn't even think there was a build for the Maestro.

It is my understanding that accelerometer usage is okay, with the potential issue being in running input shaper. I'd still like to start measuring with the accelerometer for a baseline and for mechanically trying to improve resonance.

@dc42 Can confirm if that is the case.

dc42

@ccs86 confirmed. Accelerometers should work with the Maestro, but I haven't tested that combination.

Ducati87

@ccs86 I'm using a CAT7 cable but it not working...I don't know how to fix the problem.

dc42

@ducati87 I plan to test accelerometer support on the Maestro next week.

StaticRed

@dc42 hey so i got now everything working on my board. Also using now the resistor. But now what should i do with the data? How can i now use input shaper? I mean i can view it an hit analyze, but then? Not sure what i should do next.

dc42

@ducati87 I can confirm that accelerometer support does work on the Maestro. I have update https://duet3d.dozuki.com/Wiki/Accelerometers to include a photo showing the wiring I used. The ribbon cable is 1m long.

I also successfully ran an accelerometer using exp.pa21 and exp.pa22 for the CS and INT signals instead of TWD0 and TWCK0.

jay_s_uk

@dc42 can an accelerometer be connected to a 3HC?

dc42

@jay_s_uk said in Accelerometer Usage:

@dc42 can an accelerometer be connected to a 3HC?

Not yet, but I will probably add support for that at some point.

jay_s_uk

@dc42 ok thanks. Would be helpful as I currently run all my tools off a 3HC and that's where all my wiring goes back to. Its also on the opposite side of my printer to the 6HC.

CCS86

@dc42 said in Accelerometer Usage:

@ducati87 I can confirm that accelerometer support does work on the Maestro. I have update https://duet3d.dozuki.com/Wiki/Accelerometers to include a photo showing the wiring I used. The ribbon cable is 1m long.

I also successfully ran an accelerometer using exp.pa21 and exp.pa22 for the CS and INT signals instead of TWD0 and TWCK0.

Any ideas on what to try next?

I am running:

CAT6 cable, less than 1m length.
CS is run on a conductor with an unused pair (CS on orange, nothing on orange/wht)
1k resistor on SDO
CS >>> EXP_0
INT >>> EXP_1
M955 P0 C"exp.pa21+exp.pa22"

Not found....