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howto:serial_level_adapter 2010/08/01 19:20 howto:serial_level_adapter 2017/09/06 18:38 current
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 +====== Note ======
 +
 +These directions will only be helpful if your PC has an old-school serial port, and even then it's a lot of work. It's far easier to purchase a [[http://www.ftdichip.com/Products/Cables/USBTTLSerial.htm|USB to +3.3V level shifter]] to get the job done.
 +
====== Building your own level converter ====== ====== Building your own level converter ======
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This schema is from [[http://sodoityourself.com/max232-serial-level-converter|Sodoityourself]] with two errors corrected and explicit pinout for DB-9 female. This schema is from [[http://sodoityourself.com/max232-serial-level-converter|Sodoityourself]] with two errors corrected and explicit pinout for DB-9 female.
-{{howto:max_232_level_converter.png|}}+{{howto:max_232_level_converter2.png|}}
-Please note that MAX232 circuit cann't use 3.3 Vcc from serial Vcc, you must pick up 5V elsewhere (on board or from external power supply), or else use a MAX3223, that accepts 3.3V power supply.+Please note that MAX232 circuit can't use 3.3 Vcc from serial Vcc, you must pick up 5V elsewhere (on board or from external power supply), or else use a MAX3223, that accepts 3.3V power supply.
The original schema came with Rx and Tx swapped one with each other, have a look to your level converter's datasheet if any doubt. The original schema came with Rx and Tx swapped one with each other, have a look to your level converter's datasheet if any doubt.
This schema is easy to apply on a evaluation board. This schema is easy to apply on a evaluation board.
 +
 +{{howto:quick_and_dirty_serial_lvl_adapter.jpg|}}

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