Problems installing the IR Probe on the Duet Ethernet

Bonzo

Problems installing the IR Probe on the Duet Ethernet V 1.04 in analog mode

1.) My IR Probe blinks only 2 x after switching on the printer -> Digital Mode
(even if board is only powered via USB)

This seems to be the real problem, because according to the description *) it should blink 4 times.
In other words:
I can't get the IR sample to work in Analaog mode on Duet Ethernet.

2.a) Test on laboratory power supply with 3.3V with open "out" output at the sensor lets it blink 4 times -> Analog Mode

2.b) Additional pull-up resistance 33k between "out" and "vcc" causes the sensor to flash 2 x -> Digital Mode

Under condition 2.a) I do not get a linear output signal depending on the distance. Only 3 values for the distance/voltage:
0V far away (LED off),
1.5V approached (LED off),
1.7V very close (LED on)
But this seems to be the function of the module in analog mode. Or am I mistaken here ?

This is also reflected in the printer. Also with M558 P1 I get only the values 0 or 1000 according to the digital mode.

Cable connections:

IR Probe / Duet Ethernet (Z Probe Connector)
GND / GND
VCC / +3.3V
out / Z Probe In

At first I thought my IR sample was defective.
My second one (ordered because of suspected defect) behaves like the first one.

I also made a 2nd connection cable from the IR Probe to the Duet Ethernet. This and the previous one I measured for errors at the contacts. But I can't see any error here either (e.g. contact from GND).

Where is my thinking error, please help me.

*)
https://miscsolutions.wordpress.com/mini-height-sensor-board/

dc42

Please make quite sure you have selected probe type P1 in the M558 command in config.g; so that when you power up the Duet, the internal pullup resistor is disabled. Setting it to P1 later won't have the same effect, because the IR sensor only checks for the pullup resistor once, about 4 seconds after power up.

Bonzo

Many thanks for the tip
That was the mistake.

MikeB

i have the same issue. ...

; Z-Probe
M574 Z1 S2 ; Set endstops controlled by probe
M558 P1 H5 F120 T6000 ; Set Z probe type to modulated and the dive height + speeds
G31 P500 X0 Y0 Z1.0 ; Set Z probe trigger value, offset and trigger height
M557 X40:260 Y40:260 S42.5 ; Define mesh grid

this is Cartesian duet wifi 2.0
please help???

MikeB

it seems to just light up one time when i plug in usb.

MikeB

guess no reply means tuff _____.

dc42

@mikeb said in Problems installing the IR Probe on the Duet Ethernet:

it seems to just light up one time when i plug in usb.

Do you mean that the LED on the IR sensor flashes once, or lights up and stays lit? How bright is it? A continuous dimly-lit LED on the IR sensor means that it isn't getting the Vcc supply.

MikeB

it looks normal brightness. it lights up once and then goes off. never lights up again. been over everything ten times. now z motors just buzz. getting discuraged. spent all this money...

elmoret

Could you upload a few photos showing how you have it wired? (the connectors at each end of the cable)

MikeB

aidar

Looks like you wires are connected to Duet incorrectly. Red wire (+3.3v) should be where your green (or is it blue) wire is, next pin should be free, then ground (black one) and finally closest to Paneldue connector should be green wire. Or to make it simple, you have to turn your connector 180 degrees.

MikeB

MikeB

@mikeb guess e3d messed up.

MikeB

@aidar i thank you very much !

MikeB

you fixed me bud. i owe you one! thanks again!

BLV

I have to say that David's mini IR module is the best height sensor to use with the duet board. I am getting the most accurate readings..

MikeB

@blv how is your bed setup? PICS?
and i agree is does seem to be accurate but i have much to learn...

dc42

@blv said in Problems installing the IR Probe on the Duet Ethernet:

I have to say that David's mini IR module is the best height sensor to use with the duet board. I am getting the most accurate readings..

Thanks! But in fairness, there are some surfaces that it doesn't work well with, e.g. glass with a coating of glue stick or hairspray on top.

MikeB

@dc42 yes i have read about this. i bought black paper build surface that it seems to work well with. im fighting z axes shutter right now... no printing at all.