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| howto:serial_level_adapter 2010/08/01 19:19 | howto:serial_level_adapter 2017/09/06 18:38 current | ||
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| + | ====== Note ====== | ||
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| + | 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 RS-232 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|}} | ||
