Accelerometers on a bedslinger

tecno

So I have now mounted my LIS3DSH, one on X/Z axis and one Y under the bed.

What is the best/easiest way to wire up to my Duet Mini5+ ? On X/Z I have one Toolboard V1.

dc42

@tecno see https://duet3d.dozuki.com/Wiki/Accelerometers#Section_Direct_SPI_connection_to_a_Duet_main_board. Pay attention to keeping the CS signal away from other signal wires, as I did in the cable I made up.

Alternatively, connect it to a SAMMYC21 and connect that to the D3Mini via CAN - but that costs more.

tecno

@dc42
Do I use 2 IO's one each for X/Z and Y and run both accelerometers? Or 1 IO and switch cable?

dc42

@tecno if you are connecting both via SPI, you can do either. RRF currently only supports one directly-connected accelerometer, so even if you do use two different I/O ports, you will still need to change the accelerometer config command to switch between them.

tecno

@dc42

OK one cable to one port it is then, thank you !

tecno

Is this OK?

Wire# Duet Mini5+
1 nc
2 IO_3 GND
3 nc
4 SBC26_23
5 SBC26_19
6 SBC26_26
7 IO_3 in
8 IO_3 3.3V
9 IO_3 out
10 nc

dc42

@tecno no, don't use the SBC connector, that's on a different SPI channel.

tecno

@dc42

Cables fixed today, one accelerometer and the other to have IO1 extended outside for easier tests not needed to breakdown the printer from is cabinet.

tecno

2021-08-09 13:35:50 M955 P0
Error: M955: Accelerometer not found

2021-08-09 13:29:40 M955 P0 C"io3.out+io3.in"
Error: M955: Accelerometer not found on specified port

Any suggestions what to do next?

dc42

@tecno are those results with or without the extension cable? The ribbon cable by itself should be OK if it is made up the same as the one I illustrated at https://duet3d.dozuki.com/Wiki/Accelerometers#Section_Direct_SPI_connection_to_a_Duet_main_board.

tecno

@dc42
1m and to your spec. Have continuity tested the cable/connectors. NO extension.

tecno

These are going back to seller, I do not believe these are DSH. Board looks very different to others on market. Ordered new from PureTek in UK that are on its way.

dc42

@tecno confirm you are using RRF 3.4beta2 ? Earlier versions do not support the LIS3DSH.

tecno

@dc42
Still on 3.3, expected a sign of life.

dc42

@tecno said in Accelerometers on a bedslinger:

@dc42
Still on 3.3, expected a sign of life.

If it's a LIS3DSH (not 3DH) then you won't get any response using 3.3.

o_lampe

@dc42
Is there any benefit in using the DSH variant?

dc42

@o_lampe it has higher resolution, different sampling rates and produces a slightly cleaner signal.