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I am looking at this(instructable with circuit picture) tutorial for making a self-balancing robot. However, I am confused about how the battery connects to the arduino. I know the 12 V must go to the motors to power them yet the diagram shows wires connecting to the Arduino through some kind of green device. I assume this connects to the power supply . However I do not have this green device and I don't know how to connect to the power supply. How should I get a charger cable and solder on the battery wires to the charger? If so are there any tutorials? Is the connection to the Arduino necessary?

(please look at the Firizing diagram in the instructable) Thanks

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I am looking at this(instructable with circuit picture) tutorial for making a self-balancing robot. However, I am confused about how the battery connects to the arduino.

Well, it seems he has attached a 9V battery through a voltage regulator, to the Arduino. Which is bullshit.

You can put the 9V directly into the barrel-jack of the Arduino. You actually should. Putting 5V on the barrel jack is not within the specs. (https://www.arduino.cc/en/main/arduinoBoardUno)

I know the 12 V must go to the motors to power them yet the diagram shows wires connecting to the Arduino through some kind of green device. I assume this connects to the power supply . However I do not have this green device and I don't know how to connect to the power supply.

Well, the motors only get 9V in this diagram (which might work neverthless). But bear in mind that 9V batteries won't last long.

I'm not sure what you mean by "Green device", the HC-05 or the L293D? Anyway, the L293D are quadruple high-current half-H drivers, which basically is a way to switch 12V on/off/invert based on the 5V inputs (from Arduino). You could do this with some circuitry, but I suggest picking up a "motor driver (arduino)"

How should I get a charger cable and solder on the battery wires to the charger?

You can't charge regular 9V batteries.

Is the connection to the Aruino necessary?

The specific connection he shows? No. Power to the Arduino board? Yes.

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    Well, it seems he has attached a 9V battery through a voltage regulator, to the Arduino. Which is bullshit. - It's an instructable... what do you expect? It's a repository for complete rubbish and bullshit. The rule is: if you don't have the slightest clue what you are doing, do it anyway and then post it on instructables.
    – Majenko
    May 11, 2016 at 10:00
  • @Majenko that's true, but wanted to highlight it since it really confused the person who asked the question ;) I was thinking of adding, and would like to add: "You should use reputable sources, this instructable is full of mistakes."
    – Paul
    May 11, 2016 at 11:24

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