retrolefty:
TommyE:
Hello allBeeing totally new with arduino I want to se if I can get a barometer up and running.
I understand that the arduino has a serial port thru the USB port.Yes the ardunio's AVR chip has an internal serial port and it is wire to a USB converter chip to allow serial data to and from a PC for uploading new sketches and can be used for general purpose serial communications between the arduino board the a PC with proper PC application program running, such as a terminal program.
The question is, can I Program the arduino from the pc thru the USB port, disconnect the arduino and let it run standalone, and then somehow access the serial so i can read data from the barometer attached to some og the other pins? The barometer is a module Made to interface with arduino.
Yes you can. If the arduino USB is not plugged into a PC, then you are free to use the chips serial port by wiring the receive and send TTL level serial data to shield pins 0 and 1.
I have seen some ttl to serial adapers, maybe I need one og those?
If your barometer uses TTL voltage level serial voltages then you need nothing else to wire it to arduino serial pins 0 and 1. If however is uses true RS-232 serial voltages then you do require something to convert from RS-232 serial voltages to TTL serial voltages. Check you barometer's datasheet, or post a link to it here and let us see if we can determine what you need if anything.
Good luck.
LeftyRegards
TommyE
Lefty, thanks for your answers.
I really appreciate them.
Just to ellaborate on my first post, here is a 'drawing' (if it can be called that 
) That shows how I hope the final connections can be made.
Please note that the pins on the arudino is random.
Can it be done this way?
Regards
Tommy
