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Add comments about RAMPS 5V rail for servos.

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alexborro 2013-10-22 10:38:33 -02:00
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README.md
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@ -276,6 +276,13 @@ The first define tells firmware how many servos you have.
The second tells what axis this servo will be attached to. In the example above, we have a servo in Z axis.
The third one tells the angle in 2 situations: Probing (165º) and resting (60º). Check this with command M280 P0 S{angle} (example: M280 P0 S60 moves the servo to 60º)
*For RAMPS users:*
By default, RAMPS have no power on servo bus (if you happen to have a multimeter, check the voltage on servo power pins).
In order to get the servo working, you need to supply 5V to 5V pin.. You can do it using your power supply (if it has a 5V output) or jumping the "Vcc" from Arduino to the 5V RAMPS rail.
These 2 pins are located just between the Reset Button and the yellow fuses... There are marks in the board showing 5V and VCC.. just connect them..
If jumping the arduino Vcc do RAMPS 5V rail, take care to not use a power hungry servo, otherwise you will cause a blackout in the arduino board ;-)
Next you need to define the Z endstop (probe) offset from hotend.
My preferred method: