Author Archives: James Reuben Knowles

P4 Windows Explorer Integration Not Connecting to the Correct Workspace

How to configure p4exp, the Perforce Windows Explorer integration tool. Continue reading

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How to Install gcc 4.7 on Mac OS X

How to Install gcc 4.7 on Mac OS X using MacPorts. Continue reading

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3D Printing Lesson #1 — Buy a Kit

My recommendation to first-time 3D printer builders is to buy a kit. Continue reading

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GPS Resources

These are various notes about working with GPS. Summary GPS is a bit of mess. ESR has a great summary of the problems in his article Why GPSes suck, and what to do about it, which includes a good overview … Continue reading

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5V to 3.3V Logic Level Shifting Stragety Notes

Notes on 5V to 3.3V level shifting techniques. Continue reading

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Installing Rigol DS 1052E Ultrascope Software on Windows 7

Brief notes on getting Windows 7 to talk to a Rigol DS 1052E oscilloscope. Continue reading

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Component Testing with an Oscilloscope

A nice short video introducing component testing with an oscilloscope (an “octopus”).

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Fixing Mountain Lion Runaway parentalcontrolsd

How to correct parentalcontrolsd running with a high CPU load under Mountain Lion (OS X 10.8). Continue reading

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Effects of Varying I²C Pull-Up Resistors

A link to an article entitled Effects of Varying I²C Pull-Up Resistors, which includes the Arduino internal pull-up resistors. Continue reading

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Communication Between Arduinos Using I²C

How to use I²C for communication between two Arduinos. Continue reading

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