Reddit reviews uxcell 100 Pairs 2.54mm 2 Pin Black Plastic Male Female JST-SM Housing Crimp Terminal Connector
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Pitch: 2.54mm; Pin Type: 2 TerminalsMale Pin Length: 20mm / 0.79inch; Female Pin Length: 12mm / 0.47inchMale Housing Size: 12.3 x 11 x 7mm / 0.48 x 0.43 x 0.28inch (L*W*H); Wire Female Housing Size: 18.5 x 7.8 x 9mm / 0.73 x 0.31 x 0.35inch (L*W*H)Package Content: 100 Pair JST-SM Housing Connector (200pcs Metal Terminals for Male, 200pcs for Female)Widely used as a part of the assembly of battery connector. This item is only plastic housing and pin connector, not included the wire.
You CAN use the same connector for most connections - given limitations on wire size and current carrying capability, but its a bad idea.
First off, check the game manual - lots of good info there. There's also some wiring guides online.
Motors and motor controllers power connections should use Andersons. Great connectors, shallow learning curve, easy to get good results, high reliability, current carrying capability for the connectors up to 45 amps - wire size will reduce this.
Our team switched to JST connectors for the CAN bus this year - much nicer than the bullet crimps we have used in the past. JST's are polarized and have a male / female. Each motor controller gets a male and a female, on on the in and one on the out of the CAN bus, now swapping in a controller is four connectors and you are done. One of our students spent a couple meetings with a bag of connectors, a wire stripper, a crimp tool, and her head phones and did every motor controller in the build space. Old robots, current robot, new stock.
PWM signals typically use Dupont connectors. FIRST has had a 'funny' (IMHO) rule about PWM signal wires that they must use a particular set of colors for PWM signal wires. Be sure that any extensions you make correspond to whatever your local robot inspectors interpret the right set of colors to be. (IIRC, Hi-Tec servos come from the factory with wires that robot inspectors would fail. Arguing with inspectors is NEVER a good idea - don't do it!)
Soldering is not always the best way to connect wires to connectors, properly crimped connectors are plenty strong on their own and allow the wire to flex a bit (especially stranded wire). Soldering removes some of that flexibility and can lead to broken wires. Be very aware of strain relief and range of movement for all your connectors.
When we teach wire crimping, the next step after 'crimp the wire' is 'try to pull it apart'. It's way easier to fix the crimp when you have all the tools and parts sitting on the bench in front of you, than to push everything together, put the tools away, and then discover a flying lead. Don't feel bad if your first crimps pull apart - I'm literally a grey beard and it still happens to me after 35 years of mucking about with wires. Just sigh, maybe say a few choice words ("ARRGH - Woodie Flowers Ponytail!") and do it again until you get it right.