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Computer Interfaces
Page 13d
Computer Interface:
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Last Updated on:
Thursday, November 30, 2017 01:57 PM
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Links to electronic circuits, electronic schematics, designs for engineers, hobbyists,
students & inventors:
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USB-AVR 323 Board - schematic for an ATMega323 boards The main
interface to this board is USB via the FTDI USB-Serial converter chip
(8/05) |
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USBn9603/4-Increased Data Transfer Rate using Ping-Pong Buffering -
National Semiconductor Application Note (app note added 6/06)
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USB-PC 8-Ch Power Switch - PowerSwitch provides 8 bits of
parallel output intended to switch e.g. the power supply to electronic
devices. The PowerSwitch firmware is accompanied by a command line tool
for Unix to control the device. (The command line tool can also be
compiled on Windows using minGW and libusb-win32.) ….(electronic schematic
added 11/08) |
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Use a microcontroller to design a boost converter - 4-Mar-04
Issue of EDN Boost converters, like other switchers, have
traditionally received their control signals from a dedicated circuit.
However, a recent trend is to integrate simple switching-power-supply
building blocks into generic devices, such as microcontrollers.....
[Design Idea by Ross Fosler, Microchip Technology, Chandler, AZ] |
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[ad-DAJ-FS-split.htm]
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Use a PC 's parallel Port to program a clock source - 12/07/04 EDN-Design
Ideas This Design Idea shows how you can use Linear Technology's LTC6903 programmable
oscillator as a clock source for direct-digital synthesis, data conversion,
switched-capacitor filtering, clock, and voltage-controlled oscillator circuits. The
LTC6903 operates from 2.7 to 5.5V with modest power consumption and can produce clock
signals at frequencies of 1 kHz to 68 MHz.... [Design Idea by William Grill, Honeywell
BRGA, Lenexa, KS] |
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Use a PC 's printer Port to measure frequency - 10/26/95 EDN-Design Ideas
You can plug the circuit in Fig 1 into a PC's printer port to measure frequency. The
circuit needs no external power supply, measures frequencies from 1 Hz to 5 MHz, and
displays the results on screen. IC1 (CD4536) is a 16- or 24-bit programmable counter.
In this application, you set the counter to 16 bits. IC2 is a 12-bit counter; you use
only the first 4 bits. The combination of IC1 and IC2 yields a counter with a total
length of 20 bits.... [Design Idea by Yongping Xia, EBT Inc, Torrance, CA] |
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Use a PC to Record Four Channel Waveforms - 05/25/00 EDN-Design Ideas This
design idea is a sequel to a previous one, "Use a printer port to record digital
waveforms," EDN, June 18, 1998, pg 136. Both ideas are similar: Use the PC's printer
port to sample waveforms, and use the PC's memory to store data. The technique
presented here expands the capability to four channels…. [Design Idea by Dean Chen,
Dycam Inc, Chatsworth, CA] |
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Use a PC's printer Port to measure frequency - 26-Oct-95 Issue of EDN
You can plug the circuit in Fig 1 into a PC's printer port to measure frequency.
The circuit needs no external power supply, measures frequencies from 1 Hz to 5 MHz,
and displays the results on screen. IC1 (CD4536] is a 16- or 24-bit programmable
counter. In this application, you set the counter to 16 bits.... [Design Idea by
Yongping Xia, EBT Inc, Torrance, CA] |
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Use a PIC for automatic baud rate detection - 22-Aug-02 Issue of EDN
Automatic baud-rate detection is desirable in many applications. Microchip's
(www.microchip.com] standard USART module that the company embeds in most of its PIC
microcontrollers lends itself to a simple and easily implemented automatic
baud-detection scheme. The PIC18FXX2 data sheet defines the following baud rate in
bits per second where X is the value for the baud-rate generator and FOSC....
[Design Idea by Ross Fosler, Microchip Technology, Chandler, AZ] |
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Use a Printer Port to Record Digital Waveforms - 6/18/98 EDN-Design Ideas
To record or capture special waveforms, those that appear once or have no fixed
frequency, the usual technique is to use a logic analyzer or a storage oscilloscope.
However, these tools are very expensive. Moreover, because of limited memory, a
storage scope can record fewer than 1000 samples. The....scroll to find this
circuits.... [Design Idea by Dean Shen, Dycam Inc, Chatsworth, CA] |
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Use a system's real time clock to hide a code sequence - 27-Oct-05 Issue of
EDN Keep key code sections protected from prying users.... [Design Idea by
Mihaela Costin, Delmhorst Instruments, Towaco, NJ; Edited by Brad Thompson and Fran
Granville] |
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Use power-line for baud-rate generation - 16-Aug-01 Issue of EDN One
cost-saving measure associated with 8-bit embedded microcontrollers is to use a
resistor-capacitor oscillator. These RC oscillators are inexpensive, but the trade-off
is low stability with temperature and voltage. In many applications, the low cost of
an RC oscillator is alluring, but the application requires a stable clock source for
baud-rate generation or event timing.... [Design Idea by Joseph Julicher, Microchip
Technology Inc, Chandler, AZ] |
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