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Step 2The Control Signal
In addition to power (red wire, 5 volts works fine) and ground (black wire) connections, the servo accepts a control signal on the third wire (usually white or yellow). The signal is almost pulse width modulated, except that it doesn't have a fixed period.
It is composed of pulses of voltage, the duration of which determine the angle of the output shaft. The pulses can be from 0.9 ms to 2.1 ms long, 1.5 ms being the center position (in other words, pulse duration varies linearly with shaft angle). I don't remember whether 0.9 ms means all the way clockwise or all the way counter clockwise, but it's not a big deal to test our your project, see that the servo is turning the wrong way, and reverse it in your code. A new pulse must be sent to the servo once every 10 to 20 ms (50 to 100 Hz).
These timing/voltage values are for a typical servo. You should be able to find documentation for you specific servo from the manufacturer.
It is composed of pulses of voltage, the duration of which determine the angle of the output shaft. The pulses can be from 0.9 ms to 2.1 ms long, 1.5 ms being the center position (in other words, pulse duration varies linearly with shaft angle). I don't remember whether 0.9 ms means all the way clockwise or all the way counter clockwise, but it's not a big deal to test our your project, see that the servo is turning the wrong way, and reverse it in your code. A new pulse must be sent to the servo once every 10 to 20 ms (50 to 100 Hz).
These timing/voltage values are for a typical servo. You should be able to find documentation for you specific servo from the manufacturer.
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