Step 18Hooking up the servo
If you should read the Picaxe documentation, you will read that you should use 2 different power-sources if you add servos. To put it short; We don´t mind here, this is a simple robot, and to my experience this works just fine.
Yo will need to solder an extra pin to output "0", if you want to use the standard servo connection. Such a pin comes with the Picaxe upgrade pack (a whole row, actually), but you only need one for one servo, and they can be bought in any electronics store.
If your servos cable is (Black, Red, White) or (Black, Red, Yellow), the Black should be to the edge of the board. Mine was (Brown, Red, Orange), and so the brown goes to the edge.
The hint is usually the Red; It is what is referred to as V, or any of these, used in random: ("V", "V+", "+", "1"). This is where current comes from.
The black (or brown in my case) is G, or ("G", "0" or "-"). This is also known as "Ground", and is where current goes to. (the 2 poles, +/- remember your physics-lessons?
The last color is then "The signal" (White, Yellow or Orange)
A servo needs both "+ & -" or "V & G", and a signal.
Some other devices may only need "Ground" and "Signal" (G & V), and some may both need V, G, Input and output. Can be confusing in the beginning, and everything is always named different (like I just did here), but after a while you will get the logic, and it is actually extremely simple - Even I get it now ;)
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