newb: help with RC car circuit

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haggai666

Joined Sep 19, 2017
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hello, extreme newb with electronics here. im trying to hook up my arduino to an RC car that has this circuit (attached photo). following instructions from this link http://www.instructables.com/id/Autonomous-Control-of-RC-Car-Using-Arduino/
my questions:
1. is the "ground" where it says "V+"?
2. am i supposed to connect wires from the arduino to where it says R/L/F/B? (cause that doesnt work so far) and if not, where then?

what ive done so far:
- tested the arduino for basic functioning (works)
- removed the receiver from the circuit as appears in the photo and instructed in the link.
- i tried connecting (by iron soldering) a wire to where it says R and the other side to port 7 (random) in the arduino and configuring it to send a pulse, but it doesnt do anything.

any sort of help would be appreciated
 
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