OpenServo Resources

This is a collection of documents, links and other resources related to OpenServo development.

Automatic Control Theory For OpenServo v0.3 - A document written by Zeddicus Zu'l Zorander regarding his thoughts on automatic control of the OpenServo.
Hitec Digital Servos Operation and Interface - Terrific analysis of what makes HiTec digital servos tick including their special serial mode.

AVR Freaks - Watering hole for the AVR microcontroller development community.
AVRbeginners.net - Good site for getting started with AVR development.
WinAVR - Suite of executable, open source software development tools for the AVR microcontrollers.
AVR Libc - High quality C library for use with GCC on AVR microcontrollers.
CDK4AVR - AVR Cross Development Kit - A collection of programs and development tools for AVR microcontrollers.

The I2C Bus Specification - Version 2.1 I2C bus specification from Philips.
I2C-Bus.org - Useful repository of I2C bus information.
Introduction to I2C - Primer on the I2C bus protocol.
I2C Bus Technical Overview - I2C bus technical overview and frequently asked questions.
Philips I2C Information - Links to various Philips I2C chips and devices.
Texas Instruments I2C Information - Links to various TI I2C chips and devices.
Bi-Directional Level Shifter for I2C-bus - Solution for devices with different supply voltages on one I2C-bus.

Control Information from John Shaw - Provides information about process control and the PID algorithm.
PID Without a PhD - Good article providing overview of PID algorithm and tuning.
PID and Servos - Article about PID algorithm and gain terms.
Adjusting PID Gains - Article about adjusting PID gains.
Pseudo-Derivative Feedback Control - Overview of pseudo-derivative control.
Motion Control and Industrial Controllers - Article about motion control theory.
Richard Phelan's Automatic Control Systems - Notes regarding PID and IPD algorithms.
Atmel Application note AVR221 - Discrete PID controller.
PID Loop Effect - Excellent document explaining PID and tuning in simple terms.

Introduction to Servos - Good introduction to RC servos.
Building Antweights with Servo Motors - Hacking servos for robotics.
ColinMackenzie.net - Original inspiration for OpenServo development.
High Power Servo - Article about making high power servos.
Six Transistor H-Bridge PCB - Simple six transistor H-Bridge PCB replacement for servos.
DC Motor-Driver H-Bridge Circuit - Good introduction to the H-Bridge circuit.
Determining MOSFETs for Motors - Useful Microchip application note regarding MOSFETs.
"All about servos" blog