I am trying to connect a finger probe sensor to the arduino uno r3 board. The sensor i am looking at and have researched for in the last couple of days is a nellcor ds-100 which has an RS 232 interface (DB9 connector). Now there are two problems i face.(Problem 1) How can i connect it to the board?
Explanation: I came across http://www.beepbee.com/rs232-serial-port-to-ttl-converter-communication-module-for-arduino-p-32150.html#.UUIVZzeyLbd
and this seems like a possible solution.
But do how do i connect the 6 pins to the board. According to my understanding VCC, GND and SIGNAL pin should be enough for a sensor to give the output. (Problem 2) Am i supposed to process the output?
Explanation: Do i feed the output from the ttl module directly into my board or do some processing before that? I am thinking about feeding the output to a software oscilloscope like Xocillio <Link http://code.google.com/p/xoscillo/>
Please help (Alternate solutions would be appreciated too).