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LATEST NEWS

More News 7 June 2020KicadToJlc file translator has been added. 23 August
2018Sample LED code has been added. 23 August 2018LED indicators using Dark
Cockpit philosophy has been added. 22 August 2018Active crossover rev 0 has been
added. 12 July 2012Solar Charge 200ds232 rev 0 has been added.30 August
2011Solar Charge 200ds230 rev 2 has been added.3 February 2009Stepper drive 1
has been added.20 January 2009Earth loop elimination amp 1 posted here.16
September 2008 Ongoing design on OpendCNC mark 1 updated. 12 September 2008
Quickbitsource code released. 1 September 2008 Rescalc 2008.08.28a has been
released. The new version adds a new user interface with auto calculate on
change.





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SOFTWARE

KicadToJlc 2020.06.07 kicadtojlc converts Kicad, bill of materials and location
information into a JLCPBC.com compatible format.



AVRMakeGen 2008.05.05 (GPLv3), a makefile generator for the atmel AVR series of
processors has just been released. The GUI software allows you to add files
select from a series of compilation options, and select fuses in a descriptive
fuse click box.



Rescalc 2008.08.28a
ResCalc is a GUI based resistor calculator. Modes include 1: voltage divider, 2:
parallel resistor, 3: hysteresis mode, 4: power/voltage/current/resistance
calculator. Let ResCalc find the best resistors for you (in E12 or E24).



SourceLine This application is used to as a line for line file comparison
program. The application supports options to ignore common C type syntax like //
and the popular assembly ; comment identifier. Written for software developers
by a software developer that uses it himself.

Ver 2006.12.18 adds a Binary preview.



TwinDelete is an application that hunts and deletes (optional) duplicate files.
This package is ideally suited for collection management, that is, any
collection of computer files whether source code, pictures, music files etc.
where duplicates might exist.
A "duplicate" is identified as a file that has a identical name and binary
content.



Com32D5 is a Delphi 5 comm port driver component (with source code). The
Software is an adaptation of a component written in Delphi 2 by M. Cocco in
1997. Sadly the original link doesn't exist anymore. So here is an updated
version and a download location.



Terminal ver. 20060418 is an application that allows both ASCII and direct hex
bytes of data to be sent and received on a PC's serial port.
Version 20060417 adds SLIP encapsulation, and Version 20060418 adds file
transfer ability.



Quickbit ver. 2008.01.28 , a simple binary,hex,decimal tool for software and
firmware developers. This application helps bit-hex-decimal conversions using
features like always on top and click to toggle. Now with 32 bit support for all
those ARM users.



How much current can a PCB track carry?, HotTrack calculates track widths,
temperatures and currents.



MegaPower is a current draw power calculator for the ATMega8 microprocessor.





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HARDWARE



Axtive crossover rev 0, A Loudspeaker upgrade to traditional passive cross over
circuits. Perfect flat system frequency response and reduced distortion.
Last updated 22 August 2018.




SolarCharge 200ds232 rev 0, An unconventional, scalable high efficiency 12V
solar power system, a battery charge controller with low voltage cutout to
protect the battery.
Last updated 12 July 2012.




Stepper drive 1, a simple, built and tested, circuit designed to drive stepper
motors, from low current types, to motors requiring a couple of amps. Supporting
both full step and half step modes.
Last updated 3 February 2009




Earth Loop elimination amp 1 is a buffer stage to be use where multiple earths
on audio systems produces unwanted earth loop interference.  This device reduces
the amount interference by providing a quasi floating earth at the input. Last
updated 20 January 2009




OpendCNC mark 1 part 1,2 and 3 has been releaced. A DIY CNC machine in the
making.
Updated : 1 September 2008.



NiMH charger 1 is a ATMEGA8 based switch mode, 14 hour charger that switches of
once the time is up. This project uses the AVR's USART, timers, PWM controller,
ADC, EEPROM and weak pullups .
Updated : 17 June 2008.



AVRIDE
This project demonstrates the interface between an AVR ATMEGA32 and a IDE hard
drive.
The source code accommodates both file and directory navigation,creation and
deletion. FAT16 and FAT32 (except long filenames at this stage) are supported.



SLS1
A simple linear supply with current limiting, ideally suited for static loads
like battery charging. The supply is small cheap and simple. However it does
have a high minimum volt drop.



Frequency 2005.2 is a hardware and software project which enables a PC to
measure frequencies of over 20MHz. Simple and effective, a handy tool for the
engineer.



Motor controller 1. Beta has been added. This is high current 12V H-Bridge motor
control design.
Posted : 2 Jan 2007.



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TUTORIALS


FIRMWARE TUTORIALS

Dark Cockpit
LED indicators using the Dark Cockpit philosophy. LED code Example LED code.




AVR TUTORIALS

Tutorial 1
20061113 (1) AVR processor introduction. (2) ATMega8 data sheet download. (3)
WINAVR GCC C compiler and installation guide download. Tutorial 2 Building your
AVR programmer. Tutorial 3
20061113 (1) Building your first project: A flashing light. (2) Programming your
AVR using programmers notepad. Tutorial 4
20061113 Using the ATMega8's UART. Tutorial 5
20061113 Using the ATMega8's ADC. Tutorial 6
20061113 How to use one of the AVR's PWM (pulse width modulator) channels.
Tutorial 7
20061113 The AVR SLIP tutorial demonstrates a SLIP implementation in an AVR
ATMEGA8.
This enables packet based communications between processors using the standard
UART. Project 1
20080617 NiMH charger 1 uses a ATMEGA8 to implement a software switch mode power
supply controller.
This project uses the AVR's USART, timers, PWM controller, ADC, EEPROM and weak
pullups .



Circuitcellar AVR design contest 2004 distinctive excellence awards.
AVR projects to download as examples.



Stepper motor tutorial #1
An introduction to stepper motors. Answers to :
What are stepper motors? How are they constructed? What are they good for? How
do I control them?



Stepper motor tutorial #2
Stepper drive circuitry protection.
Common protection circuits and popular mistakes. Why not to use the most common
circuit on the web.



Stepper motor tutorial #3
Stepper drive Inductance.
Still to come.



Stepper drive 1, a simple, built and tested, circuit designed to drive stepper
motors, from low current types, to motors requiring a couple of amps. Supporting
both full step and half step modes.
Last updated 3 February 2009



This is a link to a wonderful site by Martin Thomas.
A GNU ARM compiler and projects are available.
Regularly updated and Open Source. Just the way we like it.





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ABOUT OPEND

OpenD (pronounced open dee) stands for Open Design. A site dedicated to
promoting open hardware and software development.