Distance reading with Garmin lidar lite v4 over I²C with Arduino Due fails when connecting stepper driver

Asked Dec 09 '20 at 16:18

Active Dec 09 '20 at 16:18

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I am using following configuration:

Arduino Due
Garmin Lidar-lite V4 distance reading by the Arduino over I²C
Several Stepper motor controlled by the same Arduino through drivers (DM320T and DM542T)

Here is the problem: When the stepper drivers are disconnected (i.e. not powered), the distance readings work as expected over I2C, but as soon as I power the drivers, I can no longer perform distance measurements and it looks like the Lidar freezes.

It seems like there are interferences, but how to be sure? Where to start to solve this problem? Any suggestion on the steps to undertake?

The Arduino and the stepper drivers have separate power supplies, but grounds are put common.

asked Dec 09 '20 at 16:18

Joe Vray

1

Few things are needed. Like schematics and PCB and if multiple PCBs then wiring between them. – Justme Dec 09 '20 at 16:22
Common grounds and unwanted ground currents in circuit A leached from circuit B are a major concern. – Andy aka Dec 09 '20 at 16:29
Put an o-scope on the IIC lines to the Lidar and see what they are doing. – Aaron Dec 09 '20 at 17:00

Distance reading with Garmin lidar lite v4 over I²C with Arduino Due fails when connecting stepper driver

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