Posted on 19 May 2008
Interfacing an Analog-to-Digital Converter (ADC) with Linux via the parallel port is fairly simple. There two major areas that need to be addressed - hardware and software. The hardware consists of the parallel port, an ADC, and an analog signal source. The software programmed in ‘C’ language.[more]
Posted on 11 May 2008
This project was easy in concept, but it did take some work. Of course there’s a lot of soldering, but by far the trickiest part was interfacing the parallel port with Windows XP.It also works for other versions of Windows, and provides replacements for the old Outp and Inp functions.[more]
Posted on 01 May 2008
This project was developed as an inexpensive way to drive small dc brushed motors as positioning servos for use on a desktop sized CNC machine. The board is interfaced to the PC through 2 pins of a parallel port. The drive signal on these pins is known as quadrature drive. The power stage consists of a power op amp driven in constant current mode. The internal PIC processor ( a 30f4012 from Microchip ) is programmed in C through the C30 compiler and the Microchip IDE. The servo loop parameters are programmed through a serial port connection and are saved in the dspic eeprom. Once set for a particular drive, they should not need to be changed.[more]
Posted on 02 Apr 2008
Adding a cheap LCD to your PC is a popular diy project for many beginners in electronics. The parallel port however, is dead. It’s obsolete. It’s big…ugly and just awful. The solution? Add a USB interface to your existing LCDs. The circuit interfaces to a standard HD44780 compatible LCD and emulates the CrystalFontz serial protocol over a virtual COM port created by the FTDI chip. This enables you to use already existing software to speak to the LCD, for example the popular program LCD Smartie. The circuit uses an AVR microcontroller, the tiny2313, and a USB chip from FTDI.[more]
Posted on 06 Mar 2008
This is very simple AVR programmer via parallel port.Here you have the diagram for a little board containing just a a zip-socket for the uC, a crystal and very few other parts.[more]
