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Computer Interface Circuits

Computer Interface: 
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Last Updated: November 30, 2017 01:57 PM


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

Microcontroller drives logarithmic/linear dot/bar 20-LED display -  01/18/07  EDN Design Idea   Do-it-yourself analog-to-LM3914 display driver offers user programmability. . .  [by Dhananjay V Gadre and Anurag Chugh, Netaji Subhas Institute of Technology, New Delhi, India]

 

Microcontroller eliminates offboard EEPROM with "virtual-EEPROM" routines -  05/10/01 EDN Design Idea   COP8flash µCs let you allocate some of their internal flash memory as a nonvolatile storage space. This line of flash µCs accomplishes this task by accessing some memory functions built into the boot ROM. In addition to some of . . .  [by Wallace Ly, National Semiconductor Corp, Santa Clara, CA]

 

Microcontroller programmer taps power from PC’s serial port -  04/26/07  EDN Design Idea   A PC's serial port can supply enough power to supply a microcontroller programmer. . .  [by GY Xu, XuMicro, Houston, TX]

Microcontroller Supervises 0-to 20-Ma Protection Circuit -  08/26/10 EDN Design Idea   A microcontroller replaces fuses and trip circuits. . . .  [by Anatoly Andrusevich, Maxim Integrated Products]

 

Microprocessor RS-232 Reset -  This circuit allows a remote microprocessor to be reset by a controlling host by sending a break signal over an RS-232 or RS-422 serial line. If the remote machine resets into a simple program loader program, it is possible for the host to halt and restart, or halt and reload/restart the remote machine's program. This is an ideal way to develop software on older EPROM-based systems. Modern EEPROM/NVRAM systems use JTAG interfaces for similar results. . . 

Microprocessor's single-interrupt input processes multiple external interrupts -  03/02/06 EDN Design Idea   Design works for most low-end microcontrollers. . .  [by Abel Raynus]

 

Microwire Serial Interface -  Application Note . . .  [National Semiconductor]

 

Microwire/Plus Serial Interface -  Application Note . . .  [National Semiconductor]

 

MIDI cable for Sound Blaster cards -  . . . 

 

MIDI Controlled Switches -  can drive up to128 individual relays, solenoids, motors, etc. with a MIDI note-on and note-off messages  . . . 

 

MIDI Controller Foot Pedal -  Here's a simple project that sends continuous or switch controller MIDI messages that correspond to the position of a potentiometer. Given a few parts and a cannibalized volume or wah-wah pedal, you can build this MIDI controller pedal and have the ultimate source of controller data in the Universe. This pedal is especially useful in live performance, but it's also great to have around when sequencing. An added bonus: the MIDI Footpedal sports a panic button that will silence any stuck notes that come your way. . . .  [Paul Messick's web site]

 

MIDI Drum Machine Project -  The MIDI Drum Machine began in the Fall of 1991 as a project for a microprocessor system design course, shortly after I wrote PAULMON1, the 8051 monitor/debugger. . . .  [Paul Stoffregen]

 

MIDI Generator -  Control some MIDI device with ATtiny26. The code can be convert it for any AVR family microcontroller . . . 

 

MIDI Keyboard Circuit -  Build a PIC based DIY midi keyboard for under $30 and by using free VSTs (virtual instruments) you get a powerful music creation system. . . 

 

MIDI Passthrough Circuit -  . . .  [Designed by Tomi Engdahl]

 

MIDI to Cv Interface -  . . .  [by John Simonton]

 

MIDI to RS232 adapter -  The article contains two parts: a description of a circuit that translates the MIDI signal level to RS232 levels (and vice versa) , and programming notes to send and receive MIDI packets. The first part, the circuit, is general purpose --although using this converter to connect a MIDI keyboard to the serial port of your PC may require a special RS232 card. The second part, though, is specific to the H0420 programmable MP3 player. In fact, the article was written specifically to connect this MP3 player to a MIDI chain. . . 

 

Migrating Applications to USB from RS-232 UART with Minimal Impact on PC Software -  Application Note Published 3-Dec-04 . . .  [Microchip]

 

Miniature Real-Time Controller -  This is my long history home-use-controller that has been using at my home since 1997. The Miniature Real-time Controller has a 2051 chip with timer6. asm, an open collector 74LS07 and MAX232 chip. The scheduler of on/off time for 6-channel output is downloaded via PC. . . .  [Wichit Sirichote, designer]

 

MiniLOGGER V1.0 -  Build your own a personal data logger having 8-channel analog input -99mV to +999mV with 1mV resolution (CA3162) , 3-digit dual slope integrating converter, battery backup 256kB SRAM, RTC, RS232C, direct connected. . .  [Wichit Sirichote, designer]

 

ML4803 240W Off-Line Power Supply with PFC/AN-42043 -  Fairchild App Note. . . 

 

ML4824, A Novel Method for an Off-Line PFC-PWM Combo Controller/AN-42045 -  Fairchild App Note. . . 

 

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