Z axis wont home

brian

Strange. If it were just the probe…but i cant homez when only using endstops either, so much something else.

elmoret

If the probe is always reading in the 900s regardless of whether it is touching something, then either the probe is damaged or it is not wired properly. So regardless of .g files, probe homing will not work until the probe readings are correct.

Please post the config.g and homez.g files that you attempted to use with endstop homing.

Please also post the results from M119 in the following situations:

Z-endstop engaged
Z-endstop released
Z-probe activated (bed close enough to trigger it)
Z-probe released (bed far enough away to not trigger it)

brian

Configuration file for Duet WiFi (firmware version 1.19 beta6) Wifi working, z endstop not working
; executed by the firmware on start-up
; generated by RepRapFirmware Configuration Tool on Tue Jun 20 2017 17:30:36 GMT-0700 (Pacific Daylight Time)

; General preferences
M111 S0 ; Debugging off
G21 ; Work in millimetres
G90 ; Send absolute coordinates…
M83 ; ...but relative extruder moves
M555 P2 ; Set firmware compatibility to look like Marlin
M208 X0 Y0 Z0 S1 ; Set axis minima
M208 X420 Y430 Z650 S0 ; Set axis maxima

; Endstops
M574 Z0 S0 ; Define active low and unused microswitches no need for this so have changed Z1 to Z0 to indicate no endstop
M574 X1 Y1 S1 ; Define active high microswitches
M558 P1 X0 Y0 Z1 H3 F200 T5000 R0 ; smart IR Z probe, used for homing Z axis only, dive height 3mm, probe speed 200mm/min, travel speed 5000mm/min, no recovery time
G31 P500 X11.0 Y0.5 Z1.0 ; set threshold and offsets
;M558 P1 X0 Y0 Z1 H5 F120 T6000 ; Set Z probe type to unmodulated, the axes for which it is used and the probe + travel speeds
G31 P500 X0 Y0 Z0.1 ; Set Z probe trigger value, offset and trigger height
M557 X25:175 Y25:175 S25 ; Define mesh grid

; homez.g

;wiki/Configuring_RepRapFirmware_for_a_Cartesian_printer#Homing_Z_using_a_Z_probe
G91 ; relative mode
G1 Z4 F200 ; raise head 4mm to ensure it is above the switch trigger height
G90 ; back to absolute mode
G1 X0 Y0 F2000 ; put head wherever you want it to be when you home Z (omit this line if it doesn't matter)
G91 ; relative mode
G1 Z-200 S1 F100 ; move Z down until the switch triggers
G90 ; back to absolute mode
G92 Z0.3 ; tell the firmware that we are at Z=0.3mm

;G91 ; relative mode
;G1 Z4 F200 ; raise head 4mm to ensure it is above the Z probe trigger height
;G90 ; back to absolute mode
;G1 X100 Y100 F2000 ; put head over the centre of the bed, or wherever you want to probe
;G30 ; lower head, stop when probe triggered and set Z to trigger height

Z-endstop engaged = @ min stop
Z-endstop released = @ min stop
Z-probe activated (bed close enough to trigger it) = @ min stop
Z-probe released (bed far enough away to not trigger it) = @ min stop

dc42

Does the red LED on the sensor light up when the sensor is triggered i.e. close to the bed, and stay off otherwise? If yes and you are getting those readings around 900 then that suggests a faulty connection between the sensor output pin and the Duet.

elmoret

Just FYI David, I think he's using an Aus3D sensor.

elmoret

Brian, you are not configuring properly for a Z-endstop:

M574 Z0 S0 ; Define active low and unused microswitches no need for this so have changed Z1 to Z0 to indicate no endstop
M574 X1 Y1 S1 ; Define active high microswitches

That does not set up a Z-endstop in firmware. You'd need to get rid of the first line and change the second line to:

M574 X1 Y1 Z1 S1 ; Define active high microswitches

Assuming all three endstops are active high.

Please do that and re-run the M119 tests.

brian

@dc42:

Does the red LED on the sensor light up when the sensor is triggered i.e. close to the bed, and stay off otherwise? If yes and you are getting those readings around 900 then that suggests a faulty connection between the sensor output pin and the Duet.

No it doesnt. It flashes twice on start up only.

dc42

That's not right. If you have connected it correctly then it should flash 4 times at startup. Perhaps you have connected the sensor output wire to the MOD pin of the Z probe connector instead of to the IN pin?

brian

Z-endstop engaged = @ not stopped * this changed
Z-endstop released = @ min stop
Z-probe activated (bed close enough to trigger it) = @ min stop
Z-probe released (bed far enough away to not trigger it) = @ min stop

brian

@dc42:

That's not right. If you have connected it correctly then it should flash 4 times at startup. Perhaps you have connected the sensor output wire to the MOD pin of the Z probe connector instead of to the IN pin?

I've connected sensor duetwifi
power to 3.3v
grnd to mod
–-- grnd
analogue probe in

Looks like i've got Grnd on sensor going to Mod on duet.

elmoret

@brian:

Z-endstop engaged = @ not stopped * this changed
Z-endstop released = @ min stop
Z-probe activated (bed close enough to trigger it) = @ min stop
Z-probe released (bed far enough away to not trigger it) = @ min stop

This is a step in the right direction, but it seems as though that switch is active low, not active high. I assumed all three endstop switches were the same but is seems that is not the case. Try changing this:

M574 X1 Y1 Z1 S1 ; Define active high microswitches

to:

M574 Z1 S0 ; Define active low microswitches
M574 X1 Y1 S1 ; Define active high microswitches

That should set the firmware up to expect an active low microswitch on Z. The above code also assumes your endstop is at the Z-minimum, if it is at the Z-maximum then change to Z2 instead of Z1.

dc42

Tim, thanks for that. Brian, you had better talk to aus3d if you are using their sensor. It's my sensor (also so!d by Duet3D and Filastruder) that should flash 4 times at startup when connected to a Duet.

brian

@dc42:

Tim, thanks for that. Brian, you had better talk to aus3d if you are using their sensor. It's my sensor (also so!d by Duet3D and Filastruder) that should flash 4 times at startup when connected to a Duet.

I think i have found the error, as i've mount the duet upside down, and with small print its hard to see clearly. I'll check until i'm convinced i see it right.

brian

I changed the ground on the sensor to the next position on the duet .

It still only flashes twice on start up, but when bed approches the sensor a red led lights up until bed is moved away.

brian

Now the home z only moves the bed down a bit, but the home all works!!!

brian

Finally got the z probe offset to work, it resisted a lot, but is good now.

Just want to thank dc42, elmoret, and CaLviNx for getting me thru this.

fcwilt

Just love a happy ending.

Frederick