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+ | dronconoc4 | ||
A simple RS232 example project that takes all the power it needs from the serial port. Use it to power your microcontroller and communicate between serial port and microcontroller. Takes advantage of the fact that pc serial ports will accept 0-5V rather than the RS232 standard of around negative 10V to positive 10V. Very convenient - no external power required! Note that you may use either a 5.1V zener or a 5V regulator. | A simple RS232 example project that takes all the power it needs from the serial port. Use it to power your microcontroller and communicate between serial port and microcontroller. Takes advantage of the fact that pc serial ports will accept 0-5V rather than the RS232 standard of around negative 10V to positive 10V. Very convenient - no external power required! Note that you may use either a 5.1V zener or a 5V regulator. | ||
[[Image:PicPcSerialSchematic.gif ]] | [[Image:PicPcSerialSchematic.gif ]] | ||
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One thing I needed to do to use this with my solderless breadboard was to connect the metal on the bottom of the breadboard to ground. You may need a similar sort of grounded shielding near your circuitry if you use this. | One thing I needed to do to use this with my solderless breadboard was to connect the metal on the bottom of the breadboard to ground. You may need a similar sort of grounded shielding near your circuitry if you use this. | ||
− | * | + | * NÃXAS shows [http://botkin.org/dale/rs232_interface.htm how to replace the BJTs in this circuit with FETs], which is simpler and (now that FETs have plummeted in price) cheaper. |
[[Category:Projects]] | [[Category:Projects]] |