From 5b8b939a1f13c62955388f3373e96aa9deaf2454 Mon Sep 17 00:00:00 2001 From: alexborro Date: Tue, 22 Oct 2013 10:38:33 -0200 Subject: [PATCH] Add comments about RAMPS 5V rail for servos. --- README.md | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/README.md b/README.md index de8cde5f6..322c30de8 100644 --- a/README.md +++ b/README.md @@ -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: