Simple AVR programmer
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]
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AVR projects
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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]
USB to RS232 Dongle
Today and future the serial and parallel ports being phased out on new computers, hardware designers and hobbyists have no choice but to convert the USB port back to RS232 serial. FTDI have a very nice chip that does just that, the FT232AM. This chip converts USB to a standard high-speed serial port. The bonus with FTDI is the drivers are already written for you. All you have to do is design the hardware and download the serial USB drivers from FTDI’s web site. The schematic is quite simple, however the FT232AM requires a lot of external components to get it working. FTDI now have a FT232BM 2nd generation device. This device requires less external parts.[more]
Build 24 bit parallel port I/O card
This is a 24 bit I/O card designed to work with the parallel/printer port of an Amiga or PC. It uses the Intel 82C55 I/O chip to facilitate this.The device has 2 address lines, a chip select, read and write strobe. The parallel ports of the Amiga and PC have a limited (3) number of control lines, even then at different pin-outs, at least the 8 data pins line up! Remembering that the 8086 bus was multiplexed, inspired my solution, use 2 data pins with latches for the address and one control signal to control them. I then use an inverter to create /RD and /WR from another control line and the final control pin to control the chip select. [more]
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PC projects
Digitrace a Parallel port logic analyzer
Digitrace is a cool software electronics for hobbyist.You can use your own parallel port to analyze the digital signal by this software.A logic analyzer is a like a recorder for digital signals. During a certain (small) period of time, the state of a few digital lines can be recorded to a file. An event can be specified to signal the start of the recording, i.e. line 1 toggeling from 0 to 1.This recording can be viewed afterwards, allowing for zooming and scrolling in the time domain.Also,In this page a homebuilt logic analyzer is presented.[more]
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Software
