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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:

USB Sound Card with PCM2702 Make a sound card is no more a complex issue.  If you use great IC PCM2702 from BURR BROWN / Texas Instruments you can create a fully functional USB sound card.  This sound card can be __ Designed by Miroslav Batěk  Prague, Czechia

USB Stereo Recording & Playback Interface Now you can use your laptop PC to make high-quality stereo audio recordings with professional standard balanced microphones.  This interface unit lets you make recordings at sampling rates up to 48 kilosamples/second and provides high-quality stereo analog line outputs for playback or monitoring.  There's also an S/PDIF digital audio input for recording and an S/PDIF digital audio output for playback.__ SiliconChip

USB switch You can connect one USB device like a printer or scanner on 2 computers and controlled by software __ Designed by © Vassilis Serasidis

USB Test Instrument Interface for PCs With this USB interface you can turn your desktop or laptop PC into a whole suite of test instrumentsa 2-channel digital scope, spectrum analyser, AC DMM and frequency counter plus a 2-channel audio signal/function/arbitrary waveform generator.  Interested? Read on.__ SiliconChip

USB Tilt Sensor NOTE : Must register on this site __ Designed by Published in Elecktor July/Aug, 2010

USB to parallel port converter using Cypress CY7C68013A-56PVXC Circuit schematic, no descriptiongo to: https://www-user.tu-chemnitz.de/~heha/basteln/PC/USB2LPT/ul-12.en.htm __ Designed by Henrik Haftmann

USB to RS232 Adapter with FT232 We employ two UART boards in the course, one which can be connected to the serial connector of the PC (UART-RS232) , and a second that can be connected to a USB port (UART-USB).  The former is used in the lab and is part of the standard take-home equipment.  The latter is part of the (limited!) number of take-home targets for students who are working on a Laptop without serial connector.  In both cases, communication is done with the UART module of the microcontroller.  In the case of the normal UART board, the MAX232 simply transforms the voltage levels to RS-232 standards (± 3-15V; in our case 12V, with LOW=+12V and HIGH=-12V).  In case of the UART-USB, the FT232BM transforms the UART protocol to the USB protocol.  This is transparent to the controller, which communicates over the normal TX and RX pins.  

USB to RS232 Converter Why build my own USB to RS232 converter when there are adapters already available from many suppler? The Answer is simple: Neither the strand "USB to RS232 converter" actually worked *properly* with all the devices I tried.  But, They did not seem to support ALL the RS232 lines.  The USB to RS232 converter using the FT8U232AM and a Maxim-IC MAX235 

USB to RS232 Dongle With 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.  

USB to Serial Adapter RS-232 USB to Serial Adapter RS-232 Serial Port to USB The USB to Serial adapter (converter) lets you use a serial PDA, GPS, cell, etc.  with a standard USB port.  This adapter is the easiest way to add a serial port to your computer.  Many PDAs, digital cameras, GPS units, barcode scanners, and other equipment require a serial connection, and many newer computers don't have serial ports.  

USB to Serial Interface USB to serial interface is based on the powerful FT232 chip from FTDI.  It enables very easy connection of the user's application to the PC via the USB port, without necessity of any deep knowledge about the complicated USB problems.  FT232 chip is capable to transfer data at speeds up to 1M Baud in RS232 mode and up to 3M Baud in the RS485 mode.  Schematic contains the on-board serial EEPROM (93LC46) for storing the ID data (VID, PID, serial number and description strings).  

USB, FireWire, Automotive & Unregulated Wall Adapter to Regulated 5V The LTC3115-1 is a high voltage monolithic synchronous buck-boost DC/DC converter.  Its wide 2.7V to 40V input and output voltage ranges make it well suited to a wide variety of automotive and industrial applications.  A proprietary low noise switching algorithm optimizes efficiency with input voltages that are above, below or even equal to the output voltage and ensures seamless transitions between operational modes__ Linear Technology/Analog Devices App Note, Dec 5th 2011

USB/TTL Serial Cable: Extension & Supplement Two years ago, I presented here the USB/TTL serial conversion cables from FTDI — wonderful communication and debugging tools.  The increasingly frequent use of ARM.  must register on this site __ Designed by Published in Elecktor July/Aug, 2010

USB: a Neat Package with a Few Loose Ends 10/24/96 EDN-Design Feature  The USB for PCs can automatically configure and power peripherals.  But, as I learned in this hands-on project, early USB adopters may face a substantial system-level design effort.  They also need to carefully examine USB data-bandwidth characteristics __ Circuit Design by Design Feature by Richard A Quinnell

USB-Based Thermocouple Temperature Measurement System using ARM7 In the source code, an ADC sampling rate of 4 Hz is chosen.  When the ADC input PGA is configured for a gain of 32, the noise free code resolution of the ADuC7060/ADuC7061 is greater than 18 bits.  , Circuit Function and Benefits, The following features of the ADuC7060/ADuC7061 are used in this application:, Primary 24-bit Σ-Δ ADC with programmable gain amplifier (PGA): The PGA is set for a gain of 32 in the software for this application.  ARM7TDMI® core: The powerful 16-/32-bit ARM7 core with integrated 32 kB flash and SRAM memory runs the user code that configures and controls the ADC, processes the ADC conversions from the RTD, and controls the communications over the UART/USB interface__ Analog Devices from the Lab

USB-Based, Thermocouple Temperature Measurement System using ARM Cortex-M3 In the source code, an ADC sampling rate of 4 Hz is chosen.  When the ADC input programmable gain amplifier (PGA) is configured for a gain of 32, the noise-free code resolution of the ADuCM360/ ADuCM361 is greater than 18 bits.  , Circuit Function and Benefits, The following features of the ADuCM360/ADuCM361 are used in this application: , A 24-bit Σ-Δ ADC with a PGA set for a gain of 32 in the software for the thermocouple and RTD__ Analog Devices from the Lab

USB-Controlled Power Switch Build this and automatically power up all your PC's peripherals when you start the computer.  It works via the PC's USB port.__ SiliconChip

USB-LCD with PIC MicroController & FT232 USB LCD/VFD Controller is a HD44870 based LCD/VFD controller via USB interface.  The control command is compatible with Matrix-Orbital's LCD module.  So, you can use any MO friendly software to control this baby.  Such as LCDCThe firmware are based on David Potter's Serial LCD/VFD Display, but I almost rewrite the entire code.  

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.).  

USB-Powered Lithium-Ion Battery Charger With a maximum power rating 5.25V/500 mA, the USB power bus is a great source for charging a single-cell Lithium-Ion battery.  The circuit in Figure 1 shows how to build a USB-powered single-cell Li-Ion battery charger using National Semiconductor s LM3622 Li-Ion Battery Charger Controller.  

USB-Powered PC Lamp This white LED lamp lets you use your PC or laptop at night without disturbing others’ sleep.  It produces a soft white light just enough to see the keyboard in darkness...__ Electronics Projects for You

USB-Sensing Mains Power Switch Do you have to manually switch your PC's peripherals on (and later off again) each time you boot your PC? If so, this project will make life a lot easier.  It monitors your PC's USB port and automatically turns all that other gear on and off as required.__ SiliconChip

Use a microcontroller to Design a boost converter 4-Mar-04 EDN-Design Ideas 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.  An excellent example of this concept is a microcontroller that combines digital and analog circuitry and makes it easier to build simple power supp __ Circuit Design by Ross Fosler, Microchip Technology, Chandler, AZ

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- __ Circuit Design by Yongping Xia, EBT Inc, Torrance, CA

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 stor __ Circuit Design by Dean Chen, Dycam Inc, Chatsworth, CA

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 circui __ Circuit Design by William Grill, Honeywell BRGA, Lenexa, KS

Use a PIC for automatic baud-rate Detection 08/22/02 EDN-Design Ideas 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 __ Circuit Design by Ross Fosler, Microchip Technology, Chandler, AZ

Use a Printer Port to Record Digital Waveforms 6/18/98 EDN-Design Ideas NOTE :  Page contains several ideas.   Scroll for this one.   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.   __ Circuit Design by Dean Shen, Dycam Inc, Chatsworth, CA

Use a Printer Port to Record Digital Waveforms 06/18/98 EDN-Design Ideas (File includes several circuitsscroll to find this one)  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 technique presented here provIdeas an alternative method to recording digital waveforms.  The idea is to use the PC's printer port to sample waveforms, and the PC's memory to store data.   __ Circuit Design by Dean Shen, Dycam Inc, Chatsworth, CA 

Use a system's real-time clock to "hide" a code sequence 10/27/05  EDN-Design Ideas Keep key code sections protected from prying users __ Circuit Design by Mihaela Costin, Delmhorst Instruments, Towaco, NJ

Use power line for baud-rate generation 08/16/01 EDN-Design Ideas 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 __ Circuit Design by Joseph Julicher, Microchip Technology Inc, Chandler, AZ

Use printer port as programmable frequency generator 10/11/01 EDN-Design Ideas A simple and inexpensive circuit(Figure 1) and a simple C program(Listing 1] are all you need to turn your PC's printer port into a programmable frequency generator.  Using a few low-cost and readily available components, the circuit occupies little space and is easily attachable to the printer port __ Circuit Design by K Kanniappan, IGCAR, Tamil Nadu, India

Use time-domain analysis of Zobel network 06/27/02 EDN-Design Ideas A Zobel network is useful in making a reactive load appear as a pure resistance to a driving source prone to stability problems(Reference 1].  A typical situation is an audio power amplifier driving a loudspeaker, modeled at first approximation as an inductance and a series resistor(Figure 1a].  The addition of a series R2C network in parallel with the series R1L network forms a Zobel network __ Circuit Design by Noël Boutin, Université de Sherbrooke, PQ, Canada

Use two picogate Devices for bidirectional level-shifting 11-Nov-04 EDN-Design Ideas In new mixed-voltage systems, it is often necessary to level-shift a control signal from a high level to a low level.  An open-drain device, such as the 74LVC1G07, easily performs this shift.  However, when a bidirectional signal req __ Circuit Design by Bob Marshall, Philips Semiconductors

Useless Masked µCS Make Useful PC Peripherals 06/18/98 EDN-Design Ideas A software bug or a new code revision can often render hundreds of masked µCs all but useless for production purposes.  However, by tapping into the 68HC11's bootstrap mode, you can attach these µCs to a PC's RS-232C serial port and put them to work.  In the MC68HC11E9, 512 bytes of RAM are availableFile contains several Design Ideas, scroll to this one[Alec Bath, Motorola Inc, Northbrook, IL]    __ Circuit Design by Alec Bath, Motorola Inc, Northbrook, IL   

Using a PC power supply as a benchtop power supply This ATX PS board has leads for +5 (RED) , -5 (WHITE) , +12 (YELLOW) , -12 (BLUE) volts, Ground (BLACK) and switch (GREEN).  Dell power supplies manufactured between 1996 and 2000 do not follow the industry standard pinout and color codes.  The fan has also been unplugged for better viewing.  Since this PS was converted for use in the logic and robotics labs, the selected voltages  __ Designed by Andy Batts

Using a PC with a DS3900 to Communicate with DS1267s, DS1867s & DS1868s App Note/ 1172 / Feb-10__ Maxim Integrated

Using Easy-Downloader V1.1&V2.0 with Unsorted HEX Files Kurnia Wijaya from Jakarta Indonesia helps me writing the program that sorts the intel hex file generated by some compilers.   __ Designed by Wichit Sirichote

Using the joystick port as general purpose input The joystick button inputs can be used as general purpose button or switch inputs, and can also be driven by logic level signals or by open collector or open drain logic outputs.  If used with a signal direct from a mechanical contact (e.  g.  a switch, microswitch, contact, or pushbutton) , remember that the joystick port does not perform hardware debouncing, so this must be provided by external hardware or provided by software __ Designed by Tomi Engdahl

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Computer Interface:  #'s         A -  B        C -  E
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