Sleepy Pi

Putting the Raspberry Pi to sleep

As much as I wanted the SmartUPS to work for the OspreyCam project, I decided to take a look at the Spell Foundry Sleepy Pi instead. The Sleepy Pi is basically an Arduino board with regulators and switching transistors to control the power to ...

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Parallel Port Info

Parallel Port Miscellany

by Charles Lepple

Introduction

Parallel port documentation for IBM PC compatibles can be inconsistent. Most sources quote other sources, and little information is based on first-hand experience. This document is meant to remedy this shortfall.

Overview

The PC parallel port outputs TTL-compatible logic signals, although in most ...

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