Hobby Servo Wiring

superpotato

@cosmowave

Perfect, thanks for the help

c310

@cosmowave can you share brush pictures too?
thanks!

cosmowave

@c310 Yes of course.
Today evening....

cosmowave

@c310 Here are some pictures of my brush for nozzle cleaning.

The brush is made from the head of this "brush".

The system works pretty well. But it's not really necessary!
I have made this just for fun, and i had a servo laying around...
Here is a video.
https://www.youtube.com/watch?v=9iB9oI-SMB0

The config.g part for the servo is:

; Cleaning Brush
M950 S1 C"exp.heater3"		; assign GPIO port 1 to heater3 on expansion connector, servo mode
M280 P1 S1    			; set (1deg) servo position on GPIO port 1

For deploying the brush:

; this macro deploys the brush for cleaning the nozzle(s)
;
if !move.axes[0].homed || !move.axes[1].homed || !move.axes[2].homed	; are axles homed ?
	M291 P"axles not homed! perform homing ?" R"DeployBrush" S3	; message when not homed
	G28							   ; homing
if move.axes[2].machinePosition < 26					; z < 26mm ? because brush can crash with bed!
	M291 P"bed to high for brush! move 60mm down?" R"DeployBrush"		; message
	G0 Z26																; move z to 26mm
M280 P1 S90																	; set servo position to 90°
M291 P"brush ready" R"DeployBrush" S1										; message

For retracting the brush:

; this macro retract the cleaner brush
;
M280 P1 S0							; set servo position to 0°
M291 P"brush retracted" R"RetractBrush" S1			; message

Fred-Y

@cosmowave Using an external power supply is a very good advice!

I think I burned a PanelDue because of a servo directly powered by the Duet 2.

superpotato

@cosmowave

Ah great, thanks for posting this :). I didn't get the time yesterday but will try it out over the weekened.

superpotato

@fred-y Thanks for letting me know, might be best if I source the power supply just to be safe, really don't want to destroy the board

JoergS5

@cosmowave said in Hobby Servo Wiring:

I have my servo wired like this:
Duet_Mankati_Schema.pdf

Hello, thank you for sharing your schema, which helps me also. But I have a question, which is probably because of my limited electronic knowledge: isn't it necessary to connect ground of the 5V servo PSU with the Duet PSU, so the Duet knows the signal level?

cosmowave

@joergs5 Yes, you're right. The GND has to be connected, This is not shown on my scheme, because this scheme was only a quick "remender" for my old brain!

JoergS5

@cosmowave ok, thanks for clearifying. I'm doing my best to get better with electronics, but sometimes I have my problems (eg to connect ground high with low voltage - this feels very wrong and dangerous...). I plan to use servos as brakes for hinges, the servo acting as compliant switch.