Combining PC with electronics. SCADA

• 160 Baud ALDL Hardware Interface
• 300/1200 baud BAYCOM MODEM (revision and improved)
• 3-axis stepper motor controller for PC parallel port
• 7 segment rolling display using PC
• 8-way relay interface board for PC parallel printer port
• 9-pin null modem cable
• A Serial Infrared Remote Controller
• Analog Signal Acquisition for PC Printer Port
• Apple II/II+/IIe IDE Drive Interface
• Assorted computer interface circuits
• Basic Stamp I & PC Relay Controller
• Bell 202 and CCITT V23 Compatible FSK Modem Circuit
• Build your own iRDA SIR Transceiver (Dongle) using MCP2120
• Building an Infrared Transmitter for Your PC
• CCD linear image sensor to PC parallel interface
• Circuit for interfacing a relay / solenoid to a PC based on a 2N7000 FET
• Circuits to computerize your room/house
• Commodore 64 24-bit parallel port interface with 8255
• Computer Controlled Frequency Counter/Logic Probe
• Computer microphone
• Connect other circuits to PC joystick port
• Connect two CD-ROM drives to one soundcard
• Convert Atari-style joystick to PC joystick port
• Dallas DS1620 based USB Digital Thermometer
• DB-9 Connector to DB-25 (both RS-232)
• DCF77 receiver to PC RS232 serial port interface
• Ericsson phone to PC serial port interface
• Ethernet interface for Commodore 64 computer
• Extremely simple ADC for the PC (parallel port interface)
• Fake Joystick circuit
• Fax to modem interface
• FM radio for a PIC (uses TDA7000 IC which is now obsolete)
• FM radio with PC parallel port interface
• Game boy camera PC serial interface
• General purpose ISA interface card for PC
• Get power out of PC parallel port
• Get power out of PC RS-232 port
• Getting power from RS-232 interface
• GPS receiver (Gamin, Eagle etc) to PC interface cables
• HAMCOM & SoundCard MODEM using serial- or soundcard audio
• HAMCOM (SSTV, RTTY, FAX...) modem using PC-speaker for TX
• HAMCOM (SSTV, RTTY, FAX...) modem using serial audio for TX
• Headphone driving circuit for soundcards
• Hi-Fi PC Speaker System
• Homebuilt RS232 LCD Interface
• Homemade Serial to Nokia MBus Interface on a PCB, without using Zener diodes
• How to construct Garmin GPS receiver interface cables
• How to get power from PC to your circuits
• I2C printer port adaptor
• i2c-tiny-usb, a simple i2c interface for the usb port
• iLINK Interface
• Interfacing 16x2 character :LCD to parallel port
• Interfacing PC sound card to SSB rig
• iRDA interface for motherboard using Vishay TFDS4500
• Isolated Full Duplex RS232C Interface
• Jasmin floppy disk controller schematics
• Laptop Computer Serial Port Power Booster
• LCD2LPT with LIRC (LCD to LPT printer port) interface
• LCD2USB, cheap open source text LCD interface
• Linux Infra-red Remote Control (LIRC)
• Mac Serial Port (RS-422 DIN-8) to RS-232 DB-25
• Mac to HP48 cable pinout
• Machine Independent Parallel Interface
• MIDI cable for Sound Blaster cards
• More accurate PC/AT clock
• MS-DOS EEPROM Programmer
• New and Improved Sound Card Packet Interface tested with PSK31 and APRS
• Null Printer Adapter
• Parallel (Printer) Port Interface
• PC based digital thermometer based around a Dallas Semiconductor DS1621
• PC based Frequency Meter
• PC based thermometer based on Dallas DS1621
• PC electrically isolated RS422 interface using SN75176B or MAX485
• PC electrically isolated RS485 interface using MAX487 or SN75176B
• PC interface for point controller
• PC ISA board containing a Z80 microprocessor (coprocessor card)
• PC ISA Card Random Number Generator
• PC parallel port eight DC power switch cam driver two unipolar stepper motors, lights etc
• PC speaker volume control circuit
• PC thermometer using PC game (joystick) port
• PC-based ISA data acquisition and control board
• PG31 GPS RS232 GPS development board
• PG31 GPS RS232 USB development board
• Pic-Plot GPIB to RS-232 converter
• Pic-Plot2 GPIB to USB converter
• PTT and soundcard interface for the TM255/455
• PTT and/or soundcard interface
• Radio clock for PC's
• Relay interface add-on board for PC
• RFID evaluation kit for PC serial port (PDF)
• RS232 - Lowe HF-225 interface
• RS232 DB-9 switch to flip between two serial ports
• RS-232 line monitor and loopback cables
• RS-232 Protocol Analyser
• RS232 RS485 USB Converter Board
• RS232 serial to USB converter cable circuit schematic
• RS-232 surge protection
• RS-232 to TTL cable
• RS232C Level Converter
• Sanyo 20EZ monitor circuit diagram
• SB-Bus Drivers Introduction and Circuit Diagrams
• Schematic of a standard PC joystick
• Sega 3D glasses interface circuit diagrams
• Serial port temperature datalogger
• Serial servo controller for interfacing hobby servos via RS232 to a PC
• Serial to parallel converter - connect a large number of digital outputs to a PC parallel port
• Short circuit protected power supply from PC 12V supply
• Simple Hankel USB oscilloscope for a PC
• Simple music synthesizer for an ATARI
• Simple Parallel (Printer) Port Interface
• Simple PC SmartCard reader
• Simple PC thermometer for serial port but using R/C network for measurement
• Simple RS-232 serial port buffer circuit
• Simple stepper motor driver for PC parallel port
• Small circuit and PCB layout for recording to PC Sound Monitor / Pre-amp
• SmartCard PC Emulator
• Sound Blaster Microphone Preamplifier
• Stepper motor controller for PC parallel port
• SWTP PR-40 Printer Interface Schematics
• The Great Z80 Computer Project
• The KD2BD Pacsat Modem
• Thermal fan control circuit designed for overclocked PCs
• TiltStick, a motion sensing device (USB interface to accelerometer)
• TM-441 9600bps packet modification
• Transceiver to PC interface with a hardware DTMF detector and galvanic isolation (PDF)
• Transceiver to PC soundblaster interface for digital operating modes (PSK-31, RTTY, SSTV etc)
• USB camera circuit
• USB LCD/VFD Controller Hardware
• USB to parallel port converter using Cypress CY7C68013A-56PVXC
• Using a PC power supply as a benchtop power supply
• Using the joystick port as general purpose input
• Various sound card interfacing circuit diagrams
• Yaesu FT-897 - PC interface (PDF)
• Yaesu VX-7 / VX-7R to PC interface
• Z80 Computer