I want to get a RCA screen and connect through an adapter cable to the 3.5mm jack. This will be my first time setting up the pi. My question is will this work or does it automatically only send out to HDMI unless configured (which I obviously can't do since I don't have a HDMI screen)? In other words I am doing my first setup of raspberry pi and am wondering if by default the pi also sends out video to the 3.5mm jack also?
In all of my experiences, the Pi will send the signal out to whichever cable it detects as being active (connected to a display.)
However, if there is no display connected, it defaults to HDMI. And, judging by your comment, you're using NOOBS, which automatically defaults to HDMI even if there isn't a display connected. From the NOOBS Github page:
By default, NOOBS will output over HDMI at your display’s preferred resolution, even if no HDMI display is connected. If you do not see any output on your HDMI display or are using the composite output, press 1, 2, 3 or 4 on your keyboard to select HDMI preferred mode, HDMI safe mode, composite PAL mode or composite NTSC mode respectively.
- 1 to select HDMI preferred mode
- 2 to select HDMI safe mode
- 3 to select Composite PAL mode
- 4 to select Composite NTSC mode
or, you can set the preferred output mode prior to booting NOOBS by editing the the
recovery.cmdline file in the root NOOBS directory prior to booting NOOBS and tacking on the following line to the end:
DISPLAYMODENUM being 1-4, same as the buttons, each causes NOOBS to default to a different display mode.