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Computer Interface Circuits

Computer Interface: 
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Last Updated: October 24, 2017 02:54 PM


Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

AT89C2051 Line-Follower Robot Award Winner from VINGPEAW Competition 2543 by my student, again, Plermjai Inchuay.   __ Designed by Wichit Sirichote

AT89c2051/4051 Connecting Dumb Terminal Some applications may not need user display and key interface, dump terminal is an alternative way for program setting, displaying user interfacing command.  Debugging, dump terminal connects with serial port, use only 2-i/o pin, P3.0 for Rxd and P3.1 for Txd.  Any computers that has serial port and emulates as a dump terminal can be used for the purpose, the example used PC run terminal emulation program __ Designed by Wichit Sirichote

AT89c2051/4051 Stepper Motor Interface M1 is a stepper taken from an old disk drive.  There are five pins, i.  e.  , common, coil 1, 2, 3 and 4.  Resistance measured between common pin and each coil is about 75 Ohms.  Driving current for each coil is then needed about 60mA at +5V supply.  A darlington transistor array, ULN2003 is used to increase driving capacity of the 2051 chip __ Designed by Wichit Sirichote

AT89C4051 as RTC (Updated) updated Realtime Clock with LCD by Ajay Bhargav, featuring big size number! __ Designed by Wichit Sirichote

Atmega48/88/168 Development Board This is versatile development board for AVR microcontrollers ATmega48/88/168.  It is good for testing and debugging embedded programs.  It has many built-in peripheries connected to microcontroller __ Designed by Radio LocMan

ATmega8 & TWI (I2C) sensors / Devices Connect TWI   (I2C) sensors to ATmega8   (AVR) microcontroller.  This project connects ATmega8 with 24c32 eeprom, GY26 digital compass LIS302DL accelerometer, DS1307 Real Time Clock and PCT8574T I2C to parallel converter to control a 20x4 LCD.   __ Designed by Vassilis Serasidis

Atmel 89 Series Device Programmer more chips and easy-use devices programmer! __ Designed by Wichit Sirichote

Atmel AVR Infrared Downloader-Part 2-Target-Side In the first part we have considered a circuit design and software of Host-part.  The target-side consist of device minimum system based on ATmega162 and infrared hardware unit.  Device minimum system consist of ATmega162, external SRAM 8 kbyte and__ Radio LocMan

Atmel89 Single-side PCB in Protel v2.8 for Atmel 89 Series Device Programmer by Vasyl Pawluk from Ukraine __ Designed by Wichit Sirichote

Attiny12 Fuse Restorer This restores the fuses in an ATtiny12 via High Voltage Serial Programming.  Plug an ATtiny12 into the 8 pin socket and hold down "GO!" button.  The LED will come on at the end of the programming process, which only takes a couple hundred millisecond.  The fuses are now restored to their factory default states.  This picture was taken before the voltage doubler, made with the 1N916 and 100 uf capacitor were added.   __ Designed by Dick Cappels

Attobasic At90s8515/Atmega8515 & Atmega163 This interpreter uses on-chip RAM and EEPROM.  Supports power-on EEPROM Execution.  Inspired by Nascom Tiny Basic, this byte-wide basic was written to facilitate experimenting with small control systems.   __ Designed by Dick Cappels

Attobasic Byte-Wide Interpreter for Attiny2313 & At90s2313 A very small Basic interpreter for a very small chip, for limited debugging, monitor and control use.  This interpreter uses on-chip RAM only __ Designed by Dick Cappels

Attobasic with 32k of External SRAM This is a continuation of the work on AttoBaisc for the ATMega8515/AT90S8515 __ Designed by Dick Cappels

Audio DSP provides flexible serial I/O 06/05/97 EDN-Design Ideas Embedded-system designers are aware of the difficulties in connecting a IC to a large number of peripherals, such as A/D or D/A converters.  An interesting possibility, one that you might overlook but definitely should consider, i __ Circuit Design by Jerry Horn, Burr-Brown Corp, Tucson, AZ

Auto-Adjustable Regulators Power Pentium Pro 12/07/95  EDN-Design Ideas Powering Intels next-generation Pentium Pro   (P6) proves to be a nontrivial task due to both the greater-than-30W load and the need to finely adjust input voltage level on a chip-by-chip basis.  The AA32A family of switching regulators from Astec America __ Circuit Design by Maury Wright Astec America Inc, Carlsbad, CA

Autodetect Baud Rate 07/20/00 EDN-Design Ideas The popularity and easy access of RS-232 ports lend them to many communication projects.  You can use a port "as is" or as a tiny parallel port when the exchange uses only control lines.  Before the asynchronous serial-data transfer b __ Circuit Design by Alexander Eisen, State University of New York, Buffalo, New York

Automated USB controlled Power Switch Power for TV and set top box   (STB) is derived from a common switchboard.  The switched-mode power supply   (SMPS) of the TV continues to draw a small amount of power from mains and the STB is not switched off when you switch off the remote.  This next project presents a circuit that can control mains power of an LED TV and the DTH STB.  It also protects the devices from harmful initial surges when power comes back after a power failure.__ Electronics Projects for You

Automatic Power-Off Saves Battery 12/19/96 EDN-Design Ideas The Basic training program in Listing 1  helps visually handicapped people easily learn Braille dot code with the help of a trainer.  The trainer generates six-pin Braille code using six solenoids operating on an LPT1/2 either by directly connecting the low-power solenoids to the data bits of the parallel port or by driving solenoid pins  (pull-out type] using an UN2003 power driver  (Figure 1).  Push-in type solenoids require complemented  (0 for 1 and 1 for 0] Braille-code data bits or an extra inverter on the LPT1 port __ Circuit Design by Jose Carlos Cossio, Santander, Spain

Automating PC Power-Up Tired of pressing the power switch to boot your PC after mains power has been applied? This simple modification does the job for you.__ SiliconChip

Autostart helps ATX Motherboards resume operation after power interruptions 20-Jan-05 EDN-Design Ideas Unlike legacy PC motherboards, an ATX-style motherboard controls its power supply's on/off state.  If ac power fails, many ATX motherboards do not automatically restart when power returns, and that behavior is unacceptable for a server system that must provide near-continuous service.  Although some PCs provide BIOS configuration selections for "wake-on-LAN" or "wake-on-modem" operation, these op __ Circuit Design by William Mohat, Ameritech, Cleveland, OH

AVR 323 Board schematic for an ATMega323 boards   (Mega is pin compatible withAT90S8535) The main interface to this board is RS232

AVR 8 & 20 pin programming adapter Okits not pretty, but its practical.  The 20 pin connector at the far right is left over from a diffferent project and is no longer used.  This adaptor lets me program 8 or 20 pin DIP devices using the In-System Programmer   (ISP) described in Atmel's AVR910 application note.  This circuit provides power and clocks for the part to be programmed and power to the ISP circuit.  When programming 8 pin devices, the part is positioned toward pins 1 and 20 of the socket such that the 8 pins of the chip occupy the pins 1, 2, 3, 4, 17, 18, 19, abd 20 of the programming socket.  In the case of an 8 pin part being programmed, the SPST switch that grounds pin 4 must to be closed.  Conversely, when programming a 20 pint part, the switch on pin 4 must be open so the crystal can be used for the clock for the part being programmed.   __ Designed by Dick Cappels

AVR Based Serial Port IR Receiver This is a simple IR receiver circuit which plugs into a serial port of a computer.  Okay, there are many other circuits of this kind, and most of them are even simpler, but this circuit has two major advantages:   (1) it uses an Atmel AVR RISC microcontroller   (an AT90S2313) instead of the usual PIC microcontroller and   (2) it uses a MAX232 for the generation of valid RS232 levels.   __ Designed by Klaus Stock

AVR Dongle This circuit is intended to program AVR controllers such as the AT90S1200 via the parallel port.  The circuit is extremely simple.  IC1 provides buffering for the signals that travel from the parallel port to the microcontroller and vice versa.  This is essentially everything that can be said about the circuit.  The two boxheaders (K2 and

AVR Firmware Monitor Program Works on AVR controllers with RAM and a hardware UART.  This code is easily modified to integrate with ROM applications to provide the ability to monitor and interact with ROM applications via an terminal simulation program over an RS-232 port.  It can also be used to stimulate and monitor I/O to aid in debugging hardware.  It is very heLPFul to be able to look around at memory, I/O and peripherals, and change things inside a running controller.  If you adapt this to a controller with a stack pointer that is more than 8 bits wide, be sure that both registers in the stack pointer, both spl and sph, are initialized.   __ Designed by Dick Cappels

AVR Infrared Downloader-Part 1. Host-side. This project makes firmware upgrades easy: The target has an Infrared receiver and the data is sent via IR.  The IR transmitter is based on V-USB.  The host-side consist of host-program for Win32 PC using LibUSB-Win32 , device based on ATmega8 using

AVR In-System-Programmer USB AVR programmer that supports a lot of AVR microcontrollers  __ Designed by Vassilis Serasidis

AVR ISP MK2 Modding USB power supply The original AVR ISP MK2, is USB powered.  it needs to sense target power to be able to work, so why not make it power the whole target ? __ Designed by Thomas Scherrer OZ2CPU

AVR Line Following Robot Schematic and c source code for building line following robot by Priyank Patil from India.   __ Designed by Wichit Sirichote

AVR microcontroller makes improved Motor controller 10/17/02 EDN-Design Ideas The circuit in Figure 1 provIdeas a novel method of reading the pulse train using an Atmel  (www.atmel.com] AVR processor, from a typical radio-controlled receiver, and to determine the velocity of a motor.  To capture the pulse train from a typical receiver, you need an external interrupt that triggers based on a rising and a falling edge __ Circuit Design by Anthony Di Tommaso, Cranberry Township, PA, and George Simonoff, Petersburg, OH

AVR Programmers These are four different AVR programmers that can be controlled via standard ports of a PC.   __ Designed by The Electronic Lives Manufacturing-presented Chan

AVR Projects Collection | 20 ATmega MCU Projects AVR is a family of microcontrollers developed by Atmel beginning in 1996. These are modified Harvard architecture 8-bit RISC single-chip microcontrollers. ATmega series are one of the types of AVR microcontrollers with features like 4256 KB program memory, 28100-pin package, extended instruction...__ 12/01/2016EFY

AVR Student Projects Sure, Project Natal is the hotness and a little bird tells us PlayStation Move is pretty bodacious, but you don't have to buy a fancy game console to sooth your motion-tracking blues.  When students at Cornell University wanted to play Human Tetris   (and ace a final project to boot) , they taught a 20Mhz, 8-bit microcontroller how to follow their moves.  Combined with an NTSC camera, the resulting system can display a 39 x 60 pixel space at 24 frames per second, apparently enough to slot your body into some grooves -- and as you'll see in videos after the break, it plays a mean game of Breakout, too.  Full codebase and plans to build your own at the source link.  Eat your heart out, geeks.   __ Designed by Sean Hollister

AVR Thermometer Build a simple digital thermometer using 20-pin uC, AVR 90S2313 and DS1820.  The thermometer is capable of measuring temperature from -55C to +125C! with 1 degreeC resolution.   __ Designed by Wichit Sirichote

AVR TV terminal When you use microcontrollers in your designs, sometime you face a problem how to show user required data.  Several LEDs, 7 segment display or LCD module can be solution.  But if you must show a lot of information simultaneously, it can __ Designed by rlocman @ rlocman.ru

AVR910-AVR Programmer Easy-build programmer for AVR microcontrollers.  The firmware is based on AVR910 App Note by ATMEL.  The programmer can be used with AVR Studio, AVR-Prog, AVRDUDE and AVR OSP.   __ Designed by Wichit Sirichote

AVR-USB Remote Sensor Remote Sensor is a wireless thermo- and hygrometer with an USB port on the receiver.  You can draw fancy diagrams of temperature and humidity for up to 16 wireless sensors.  

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