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Computer Interface Circuits

Computer Interface: 
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Last Updated: December 01, 2017 03:24 AM

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

Network Storage with Raspberry Pi An always-on network backup device accessible to a computer from both outside and inside the network is a highly desirable thing.  As the system will always be on, power consumption is...__ Electronics Projects for You

Network Wiring Tester Like all its counterparts, this network wiring tester comprises two elements, a transmitter unit, powered and fitted at the network start point, and a receiver unit, passive, which can be moved around from socket to socket.  Each of these units carries eight LEDs, .  must register on this site __ Designed by Published in Elecktor July/Aug, 2010

New & Improved Sound Card Packet Interface tested with PSK31 & APR - S Most of the digital communications used in the amateur bands use some form of tone translation.   One tone will represent a high and another tone will represent a low, and by shifting between  tones data can be transmitted and received.   The data is then fed to a computer program that decodes the data in to understandable language or pictures.__ KD5ZUG

New Developments In RS-232 Interfaces DN320 Design Notes __ Linear Technology/Analog Devices

Night Light Saver V3.2 Now it's time for Microchip PIC12C508 8-pin Microcontroller.  The saver turns a night light on and off with preset time, no battery backup, easy installation.  (not recommended) __ Designed by Wichit Sirichote

Night Light Saver V5.0 I have designed a device that controls a night light at home.  The saver uses 2051 chip and a small TRIAC.  The saver features low-cost, simple installation, no battery backup, and save energy.   __ Designed by Wichit Sirichote

Night Light Saver V6 Latest design night light saver, built with sdcc __ Designed by Wichit Sirichote

Novel Floating Current Source 05/01/03  EDN-Design Ideas One-shot provIdeas frequency discriminationFigure 1 shows a polarization circuit applicable to ISFET (ion-sensitive field-effect-transistor] sensors.  ISFETs are solid-state chemical sensors that measure the pH value of a solution i __ Circuit Design by S Casans, AE Navarro, and D Ramirez, University of Valencia, Burjassot, Spain

Novel Idea Implements Low-Cost Keyboard 3-Apr-03 EDN-Design Ideas Many applications that use a microcontroller also use a keyboard.  If your application uses a relatively powerful microcontroller, you can use several free I/O pins or an unused input with an ADC to effect an easy keyboard connection.  But, if the microcontroller in your system has too few free I/O pins and no on-chip ADC, you can be in trouble __ Circuit Design by Jean-Jacques Thevenin, Thomson Plasma, Moirans, France

NRZ to AM I converter uses single supply EDN-Design Ideas 03/09/2015    Convert serial data to AMI format with this simple Design Ideaslternate mark inversion (AMI) coding is often used in digital data trasnmission over cables as it has no DC component.  BesIdeas, the bandwidth of an AMI signal is lower than the equivalent return-to-zero (RZ) format.  Normally, to generate a bipolar waveform such as AMI, one needs positive and negative supplies.  Also, the circuit will likely employ analog components for bipolar waveform  generation.  However, this Design Idea eliminates all these requirements and generates an AMI waveform from an NRZ input using only a few gates, a flip-flop, and a single 5V supply. __ Circuit Design by Ramachandra Mutagi

Null Modem cable 9-pin Circuit only, no circuit description included.   __ Designed by Tony van Roon  VA3AVR

Null Printer Adapter This circuit is a simple adapter for PC parallel port to think that there is a printer connected to computer.  This adapter is useful for testing printing speed with different software and as a part of your own designs. 
You can use this circuit to connect your simple circuits to the parallel port __ Designed by Tomi Engdahl

Octal DAC Interfaces to DSP µp EDN-Design Ideas 05/23/96    The circuit in Figure 1 shows how you can connect an octal DAC (MAX521) to a DSP µP (ADSP- 2101) using 2 bits of a port mapped into the data memory.  The interface circuit includes a 1 kV current-limiting resistor on the SDA signal line because the DAC pulls the SDA line low in certain clock cycles.  The SDA and SCL lines must be high when the serial bus is not in use. __ Circuit Design by Dhananjay Gadre, IUCAA, Pune, India

One µC pin makes half-duplex RS-232C 08/05/99 EDN-Design Ideas In many µC designs, nearly all the I/O pins are occupied.  If only one I/O pin is available, the circuit in Figure 1 can help you implement a serial RS-232C interface.  For many purposes, half-duplex operation using a software-driv __ Circuit Design by Marin Ossman

One Second Time Base from Crystal Oscillator The schematic above illustrates dividing a crystal oscillator signal by the crystal frequency to obtain an accurate   (0.01%) 1 second time base.  Two cascaded 12 stage counters   (CD4040) form a 24 stage binary counter and the appropriate bits are gated together to produce the desired division.  Using a crystal of some even multiple of 2 is desirable so that one stage of the counter automatically toggles every second which eliminates the need for the NAND gate and reset circuitry, however the circuit below illustrates using a crystal which is not an even multiple of 2 and so requires additional __ Designed by Bill Bowden

One wire connects microcontrollers 10/22/98 EDN-Design Ideas   (File has several circuits, scroll to find this one)  Low-cost µCs, such as Motorola's 68HC705 Series, offer great simplicity at the expense of some useful functions—notably, serial data transmission.  Unlike their predecessors, these µCs do not have serial communication interfaces   (SCIs), serial peripheral interfaces   (SPIs), or simple serial I/O ports   (SIOPs).  This method describes how you can overcome this deficiency by creating an asynchronous serial interface through µC software __ Circuit Design by Abel Raynus, Armitron International, Melrose, MA

One-wire keypad interface frees microcontroller-I/O pins 03/31/05  EDN-Design Ideas Using this interface topology, you can reduce the number of keypad interface wires to just one and thus save critical microcontroller I/O ports __ Circuit Design by Israel Schleicher, Prescott Valley AZ

Opendiag OBD-II Schematics & PCB Layout Opendiag OBD-II Schematics & PCB Layout Back in 2000 I created some open-source hardware: An RS-232 to OBD-II interface.  I’m posting the details of that project here so that I can shut down my old website.  I’m no longer interested in this project, but it gets a surprising amount of traffic every day.  I wanted to make sure it’s still available here in case anyone wants it. __ Designed by © Jeff Noxon

Optically isolated stepper Motor controller These are some very high-level instructions for building the Opto-Isolated Stepper Motor Controller. Not really a lot to say. Most of the construction is self-explanatory using the PCB artwork, the overlay, and the schematic. Note that the pad for pin 1 on ICs and such are square to help in proper placement. All ICs on the board are NOT oriented the same way, so pay attention. __ Contact: wrb @ cbnews . att.com

Optimizing a Silicon Bipolar LNA Performance for Blue Tooth Applications 12/11/00 App Note  Doc #931__ California Eastern Laboratories

Optimizing Bluetooth Device Battery Drain Measurements in Manufacturing Application Note__ Aligent

OSRAM OLED interface Bright OLED graphical module 94*64 pixels.  Very nice for portable applications. __ Designed by Michel Bavin

OverVoltage Protection for LM317 It is a voltage regulator that allows a 6v portable supply to be derived from the 12v car battery.  You can add a 6.2V zener diode and a LED to warn you when the input supply is overvoltage.  If you could find a relay that would operate from 6.2v right up to 12v that you could connect in such a way that if over voltage occurred,  __ Designed by submitted Adam

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