PID Hardware Photos

I was (and hope to again) working on a PID loop for the dragon’s main light. The idea is simple- vary the heat lamp using a servo and rheostat. Some of you have expressed interest. Here are the photos of the servo setup. The code however is so bad I don’t even know where to start. If you get something working please let me know!

The servo and linkages work perfectly through the full 180 degree range. The issue is the PID code….

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Getting Windows Process Command Line

Windows Server 2008 and Windows 7 introduced a neat feature in the Task Manager that allows you to see the command line that instantiated the process. This is great for telling processes apart. Especially when svchost and others can have dozens of instances.

Just click View -> Select Columns and pick Command Line at the bottom.

But what if you have Windows Server 2003 or Server 2000? I found a few tricks. They’re not as clean but they work just as well.

This one just lists the processes, their PID and the “services” that are associated with them

tasklist /svc

This one makes a nice text file with much more info

wmic process get Name,ProcessId,CommandLine /format:table > wmic_task_list.txt

The text file lists the name, process id, command line and puts it in a table in a text file. Genius!

If you want to get really geeky you can see all the wmic options using this command. It can do some really nice output.

wmic process list /format /?

Hope this helps someone! I use it on a regular basis to find out why svchost is going bat shit crazy on my servers. We all know it likes to hit full cpu usage from time to time and these commands will help you find out which process is causing it.

Most often I’ve found that it has to do with Windows Updates but you never know.



PID? What is it?

Wikipedia says that a proportional–integral–derivative controller (PID controller) is a generic control loop feedback mechanism (controller) widely used in industrial control systems – a PID is the most commonly used feedback controller. A PID controller calculates an “error” value as the difference between a measured process variable and a desired setpoint. The controller attempts to minimize the error by adjusting the process control inputs.

So what?

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