Electronic projects related to computers
The DC motor drive controller can control two DC motors of varying current or voltage ratings, depending on the relay specifications. The circuit includes two shaft encoders that provide positional feedback to a computer. The motor control circuit connects to an IBM PC parallel port through a 74LS192 four-bit latch DMX 512 printer port interface. This setup includes schematics and software necessary to create a cost-effective 64-channel DMX 512 printer port interface. Additionally, it features schematics for a 4-way DMX booster/splitter and a 12-channel DMX flasher. These designs utilize Microchip PIC 16F84 microcontrollers and are straightforward to assemble. An isolated full-duplex RS232C interface is also provided, which protects the PC by electrically isolating the TxD and RxD lines from direct hazardous voltage connections. A logic analyzer using the PC's parallel port can record up to 8 channels, sampling at rates of up to 1 million samples per second, with a capacity to store 32,768 samples. The LPTCAP parallel port print capture system allows an IBM-compatible PC running MS-DOS to capture print data from another PC or any device with a Centronics parallel printer interface. A multi-wire cable tester is included, featuring a separate LED for each wire to indicate open circuits, short circuits, reversals, earth faults, and continuity, using four integrated circuits. The system also supports remote control for Windows via infrared, allowing any standard handheld remote control unit to operate the PC. The RS232 laser transceiver enables communication between two computers with serial (RS-232) capabilities over distances of up to 200 meters using a laser beam. Additional components include an RS232 to IrDA converter and an RS232 to RS485 converter, with the RS232 connector compatible with PCs, translating TxD and RxD from RS232 to RS485 with communication traffic indicated by LEDs. A serial infrared remote controller connects to any serial port to control devices with infrared remote controls. The serial port A/D converter circuit, based on the TLC548 A/D converter chip, connects to a PC's serial port to convert analog signals to digital form. This application note illustrates interfacing an A/D converter with a standard serial port, utilizing RTS and DTR lines for CS and SCLK emulation, respectively. Conversion data appears on the DSR line, and example C code is provided for demonstration. The serial port-controlled IR transmitter is a programmable device that can send various remote control formats, including the Philips RC-5 standard, and operates through a PC serial port. Lastly, the serial to parallel converter based on the AT89C2051 runs at 9600 baud, outputting each byte received on a Centronics-style parallel port with a nominal 50-microsecond strobe. The converter also buffers incoming bytes if the busy signal is active and operates bidirectionally.
The DC motor drive controller circuit is designed for versatility, allowing control of two DC motors with varying specifications, making it suitable for a wide range of applications. The integration of shaft encoders provides accurate positional feedback, enhancing the motor control system's performance and reliability. The use of the IBM PC parallel port and the 74LS192 four-bit latch facilitates easy interfacing with computers, enabling users to implement complex control algorithms without extensive hardware modifications.
The schematics for the 64-channel DMX 512 printer port interface provide a robust platform for lighting control and other applications requiring multiple channels of digital output. The designs for the DMX booster/splitter and DMX flasher enhance the system's capabilities, allowing for distributed control and synchronization of multiple devices.
The isolated full-duplex RS232C interface is critical for applications where electrical isolation is necessary to protect sensitive equipment from high voltages, ensuring safe operation in industrial environments. The logic analyzer capability, with high sampling rates and significant data storage, allows for detailed analysis of digital signals, making it an invaluable tool for debugging and testing electronic circuits.
The multi-wire cable tester enhances troubleshooting capabilities in wiring systems, providing visual feedback through LEDs for various fault conditions. The inclusion of remote control capabilities via infrared adds convenience, allowing users to interact with their systems from a distance.
The RS232 laser transceiver is particularly useful for applications requiring wireless communication over long distances, while the RS232 to IrDA and RS232 to RS485 converters expand the system's connectivity options, enabling communication with a variety of devices and networks.
Overall, this comprehensive circuit design provides a versatile toolkit for engineers and hobbyists alike, facilitating the development of complex electronic systems with robust control and feedback mechanisms.DC motor drive controller control two DC motors of any current or voltage rating, depending on the rating of the relays. The circuit also provides two shaft encoders for positional feedback to the computer, the motor control circuit is connected to an IBM PC parallel port, via a 74LS192 four-bit latch DMX 512 printerport interface page This page c
ontains schematics and software to build your own cheap 64 channel DMX 512 printerport interface. It also contains the schematics for a 4-way DMX booster / splitter and a 12 channel DMX flasher. These designs are based on Microchip Pic 16F84 microcontrollers and very easy to build, schematics Isolated full duplex RS232C interface this self powered interface circuit electrically isolates the TxD and RxD lines from the PC serial port and protect the PC from direct connection to hazardous voltages Isolated full duplex RS232C interface this self powered interface circuit electrically isolates the TxD and RxD lines from the PC serial port and protect the PC from direct connection to hazardous voltages Logic analyzer using the PC`s parallel port record up to 8 channels, use any parallel port, sampling at up to 1 million samples per second, record 32768 samples LPTCAP parallel port print capture system LPTCAP is a hardware and software solution which allows an IBM-compatible PC running MS-DOS to capture print data sent by another PC, or any device with a Centronics parallel printer interface Multi Wire Cable Tester A multi wire cable tester with a separate LED for each wire. Will show open circuits, short circuits, reversals, earth faults, continuity and all with four IC`s Remote control for Windows IR control for Windows, the hardware and software required to remotely control your PC by means of any standard hand held remote control unit RS 232 laser transceiver this circuit allows any two computers with serial (RS-232) communication capability to communicate over 200 meters using a laser beam RS232 to IrDA converter RS232 to RS485 Converter RS232 connector compatible with PC, TxD and RxD translated from RS232 to RS485, RS485 signals output on 6 way modular jack, Indicator LED(s) to show communications traffic Serial Infrared remote controller This is a simple, cheap device that can be connected to any serial port to control most components that have infrared remote controls Serial Port A/D-converter This circuit is a simple 8-bit analogue to digital converter circuit which is connects to PC serial port.
The circuit is based on TLC548 A/D-converter chip Serial Port A/D-converter This application note provides an example of interfacing an A/D converter to a PC using a standard serial port. The CS lines and SCLK lines are emulated by the RTS and DTR lines respectively. Conversion data appears on the data-set-ready (DSR) line. Example C code is given to demostrate the application circuit, PC Serial Port Drives 12-Bit A/D Converter, pdf file Serial port controlled IR transmitter This is a programmable infrared (remote control) transmitter, which can be controlled from a PC serial port.
It is capable of sending many remote control formats, including the Philips RC-5 standard Serial to parallel converter AT89C2051, The converter runs at 9600 baud, and outputs each byte received on a centronics style parallel port, together with a nominal 50 microsecond strobe. The converter buffers up the bytes received if busy is active, and is bidirectional 🔗 External reference
The DC motor drive controller circuit is designed for versatility, allowing control of two DC motors with varying specifications, making it suitable for a wide range of applications. The integration of shaft encoders provides accurate positional feedback, enhancing the motor control system's performance and reliability. The use of the IBM PC parallel port and the 74LS192 four-bit latch facilitates easy interfacing with computers, enabling users to implement complex control algorithms without extensive hardware modifications.
The schematics for the 64-channel DMX 512 printer port interface provide a robust platform for lighting control and other applications requiring multiple channels of digital output. The designs for the DMX booster/splitter and DMX flasher enhance the system's capabilities, allowing for distributed control and synchronization of multiple devices.
The isolated full-duplex RS232C interface is critical for applications where electrical isolation is necessary to protect sensitive equipment from high voltages, ensuring safe operation in industrial environments. The logic analyzer capability, with high sampling rates and significant data storage, allows for detailed analysis of digital signals, making it an invaluable tool for debugging and testing electronic circuits.
The multi-wire cable tester enhances troubleshooting capabilities in wiring systems, providing visual feedback through LEDs for various fault conditions. The inclusion of remote control capabilities via infrared adds convenience, allowing users to interact with their systems from a distance.
The RS232 laser transceiver is particularly useful for applications requiring wireless communication over long distances, while the RS232 to IrDA and RS232 to RS485 converters expand the system's connectivity options, enabling communication with a variety of devices and networks.
Overall, this comprehensive circuit design provides a versatile toolkit for engineers and hobbyists alike, facilitating the development of complex electronic systems with robust control and feedback mechanisms.DC motor drive controller control two DC motors of any current or voltage rating, depending on the rating of the relays. The circuit also provides two shaft encoders for positional feedback to the computer, the motor control circuit is connected to an IBM PC parallel port, via a 74LS192 four-bit latch DMX 512 printerport interface page This page c
ontains schematics and software to build your own cheap 64 channel DMX 512 printerport interface. It also contains the schematics for a 4-way DMX booster / splitter and a 12 channel DMX flasher. These designs are based on Microchip Pic 16F84 microcontrollers and very easy to build, schematics Isolated full duplex RS232C interface this self powered interface circuit electrically isolates the TxD and RxD lines from the PC serial port and protect the PC from direct connection to hazardous voltages Isolated full duplex RS232C interface this self powered interface circuit electrically isolates the TxD and RxD lines from the PC serial port and protect the PC from direct connection to hazardous voltages Logic analyzer using the PC`s parallel port record up to 8 channels, use any parallel port, sampling at up to 1 million samples per second, record 32768 samples LPTCAP parallel port print capture system LPTCAP is a hardware and software solution which allows an IBM-compatible PC running MS-DOS to capture print data sent by another PC, or any device with a Centronics parallel printer interface Multi Wire Cable Tester A multi wire cable tester with a separate LED for each wire. Will show open circuits, short circuits, reversals, earth faults, continuity and all with four IC`s Remote control for Windows IR control for Windows, the hardware and software required to remotely control your PC by means of any standard hand held remote control unit RS 232 laser transceiver this circuit allows any two computers with serial (RS-232) communication capability to communicate over 200 meters using a laser beam RS232 to IrDA converter RS232 to RS485 Converter RS232 connector compatible with PC, TxD and RxD translated from RS232 to RS485, RS485 signals output on 6 way modular jack, Indicator LED(s) to show communications traffic Serial Infrared remote controller This is a simple, cheap device that can be connected to any serial port to control most components that have infrared remote controls Serial Port A/D-converter This circuit is a simple 8-bit analogue to digital converter circuit which is connects to PC serial port.
The circuit is based on TLC548 A/D-converter chip Serial Port A/D-converter This application note provides an example of interfacing an A/D converter to a PC using a standard serial port. The CS lines and SCLK lines are emulated by the RTS and DTR lines respectively. Conversion data appears on the data-set-ready (DSR) line. Example C code is given to demostrate the application circuit, PC Serial Port Drives 12-Bit A/D Converter, pdf file Serial port controlled IR transmitter This is a programmable infrared (remote control) transmitter, which can be controlled from a PC serial port.
It is capable of sending many remote control formats, including the Philips RC-5 standard Serial to parallel converter AT89C2051, The converter runs at 9600 baud, and outputs each byte received on a centronics style parallel port, together with a nominal 50 microsecond strobe. The converter buffers up the bytes received if busy is active, and is bidirectional 🔗 External reference
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