How to Make a Raspberry Pi Time Capsule

15 Oct 2016

I’ve been wanting to do something useful with my Raspberry Pi lately, so I decided to make a network-connected backup drive for use with Time Machine on my Mac. There are lots of online articles that explain the process, though many seem full of extraneous steps. In this post, I’ll outline a minimalist approach to creating your own Time Capsule from a Raspberry Pi.

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Pull-up & Pull-down Resistors

07 Mar 2015

In understanding how pull-up and pull-down resistors work for microcontroller inputs, and why they’re necessary, it’s important to see a circuit diagram. Unfortunately, most circuit diagrams on the Internet are somewhat incomplete – that is, they’re usually missing the microcontroller along with its input impedance (resistance) and ground. Without these, it can be somewhat unclear when attempting circuit analysis (using Ohm’s Law and the like) just exactly why pull-up and pull-down resistors work. The following circuit diagrams and calculations are an attempt to provide a more complete picture.

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