Serial port projects ( 22 ) :

• 5V Supply Derives Power From 3-Wire RS-232 Port - The circuit of Figure 1 produces a semi-regulated 5V output from an RS-232 port. Unlike a PC-mouse supply or comparable circuits that rely on the modem-control signals DTR and RTS, this one operates with a 3-wire port (GND, Rx, and Tx), and obtains power only from the Tx line. The output current-about 8mA-is sufficient for CMOS microcontrollers and other low-power circuits.   
• Apple Macintosh serial port connector pinout - useful in Apple related interfacing projects
• Bidirectional RS-232 Communication Uses Only One I/O Line - sometimes when designing with microcontrollers, it's necessary to include a bidirectional serial communications capability, but, only a single I/O line is available   
• Connections Newsletter 2: Serial port powered devices - understanding serial port power capabilities, pdf file   
• Determining Baud Rates For 8051 UARTS And Other UART Issues    Rate this link
• Drawing power from a PC Serial port - circuit to get few mA at 5V from RS-232 port, buitl using dicrete components only   
• ESD Considerations for RS-232 Drivers   
• Linux Infra-red Remote Control (LIRC)   
• Implementing a Simple Serial Mouse Controller using PIC16C5x   
• Make RS232 serial port bus   
• Microprocessor Serial Port Break-Reset Circuit - This circuit allows a remote microprocessor to be reset by a controlling host over a remote RS-232 or similar protocol serial line. With the use of a program loader on the remote host, a program may be downloaded and run.   
• Miniature 3 V CMOS to V.24 adapter using MAX232   
• PC Mouse Implementation Using COP800 - pdf file   
• Power for your circuits from RS-232 signal lines   
• Drawing power from a PC Serial port - circuit to get few mA at 5V from RS-232 port, buitl using dicrete components only   
• RS-232 Laser Transciever - communicate over 200 meters using a laser beam from laser pointer   
• RS-232C port scans remote keypad   
• RS-232C powers and reads 8-bit switch matrix - provides a remote menu-selection switch matrix for PCs   
• RS-232 serial port cable wirings   
• Serial Interface for CASIO SF series Digital Diaries - simple level converter using MAX232   
• Simple RS-232 optoisolator idea   
• Wiring a Null Modem cable - Null Modem pin connetion for both 25 and 9 pin RS-232 connectors   

 back to : Links >> Computer Hadrware