Updating computer clock advantages of consolidating exhibit houses

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Each second pulse on the GPIO pin causes an interrupt in which the CPU clock is noted, and then used by NTP to make fine adjustments to the software clock speed.The transients of a few microseconds amplitude lasting for about an hour may be due to sudden ambient temperature changes affecting the crystal used by the card's clock generator.As an experiment, I purchased one of the low-cost credit-card-size Raspberry Pi computers, and have configured it to run NTP (Network Time Protocol).

When using a u-blox MEO-6M GPS module, with its PPS pin connected to the GPIO 24 pin for a kernel-mode "ATOM" ref-clock, similar results are obtained.I bought an attractive blue case and 5 V, 2 A power-supply from Mod My Pi.You can see the Ethernet lead on the left, and the 4 GB SD card with the operating system on the right, together with the micro-USB power lead.There are some helpful Linux commands scattered throughout this page.These notes are almost as much for my own records for the next time I need to visit this project, but I hope they may be helpful to others.

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