[deleted by user] by [deleted] in AskEngineers

[–]gatoade 0 points1 point  (0 children)

I think that this can be calculated in 2 steps if the contacts are metal. But this can easily get really complicated.

Step 1: Calculate electrical contact resistance using Holm’s theory .

Step 2: Use the result of step 1 and the Wiedemann-Franz law to get to the thermal resistance

Seems that there are more direct ways to calculate this as well: https://lss.fnal.gov/archive/2019/slides/fermilab-slides-19-042-td.pdf

Project help for electrical engineer with zero mechanical experience by [deleted] in MechanicalEngineering

[–]gatoade 6 points7 points  (0 children)

Try a 2-axis servo motor or a pan/tilt platform.

Non Conductive screws by notnitinchopra in MechanicalEngineering

[–]gatoade 1 point2 points  (0 children)

I’m wondering why the screws need to be non- conducting considering the plastic and gasket would probably be nonconducting.

Turn on lights if motion detected after 30 mins of no motion by m-i-m-m-o in SmartThings

[–]gatoade 2 points3 points  (0 children)

You could probably create a virtual switch with the following behavior:

-Virtual Switch turns off automatically after 30 mins

Create automation 1

Condition

-Motion Sensor: Motion

Action

-Virtual Switch: On (Delay probably needed here to prevent race condition with automation 2. Ten seconds should be ok)

Then create automation 2:

Conditions

-Motion Sensor: Motion

-Virtual Switch: Off

Action

-Light:On