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Archive for July, 2005

PDA Keyboard Tested

Tuesday, July 12th, 2005

I connected a Palm keyboard to the PassMe serial interface. After initial trouble, I got it to show scan codes when keys are pressed/depressed. This can be used for fast text entry if needed…

passme-kbd-bottom.jpg passme-kbd.jpg 

Bluetooth module tested

Tuesday, July 12th, 2005

Today I tested a Serial-to-Bluetooth module connected to my PassMe serial interface. It’s Class 1 Bluetooth with 100+ metres (300+ feet) line-of-sight range. I could send and receive data using HyperTerminal. Next step would be to write some useful application for it … e.g. IRC client :)

Perhaps it’s possible to connect to a Bluetooth cell phone? I requested some documentation from the manufacturer.


RS232 Level Converter

Saturday, July 9th, 2005

If one wants to connect PassMe serial interface to devices with RS232 voltage levels (such as a serial COM port of the computer), one has to use a level-converter. Here is a small level-converter I made using a MAX3221 chip. It plugs right into the serial interface connector.

level-converter-soldered.jpg level-converter-size.jpg 

Serial Interface for PassMe

Sunday, July 3rd, 2005

Serial Interface for PassMe How-To posted under Projects. This interface allows to communicate with computer and other devices such as other DS, PDA keyboards, motor controllers, etc…

© 2010 Alexei Karpenko (natrium42)