I'm new to robot making so i apologize if my questions are somewhat noobish
I'd like to know what type of presets that was used in the 40$ line follower robot tutorial available here http://www.societyofrobots.com/member_tutorials/node/59
I couldn't find any potentiometer with 2 terminal together and one alone
here is the link of the resistors page where i buy electronics :http://ram-e-shop.com/index.php?cPath=31_76
would somebody tell me which one should i buy?
also if i couldn't find any 20k Presets can i use 10k or 50k?
Another question about the same tutorial :
I've seen the same PCB in the electronics shop but i've not yet bought it ,but i don't understand how it works , its not like those pcbs that have each 5 pins in a row connected right?
i think that each pin works by its own thats why the tutorial maker soldered anything to wires if he wanted to make connections?
Is that true?