Problem with IR sensor
I have connected the IR Sensor to the Z-probe connector next to the Panel Due….When powering with USB only the sensor flashes 4 times, as expected. But after that it always reads 220 independent of distance
I checked the connectivity of the signal with an ohm meter and it shows that it is connected.....
Since it blinked 4 times it is powered correctly. So I powered the Duet Wifi with 24V and now it always reads 0
Can I do some more troubleshooting?
O and I have this config.c…....as it came from the reprap config
M574 Z1 S2 ; Set endstops controlled by probe
M558 P1 H5 F120 T6000 ; Set Z probe type to unmodulated and the dive height + speeds
G31 P500 X0 Y0 Z2.5 ; Set Z probe trigger value, offset and trigger height
M557 X15:285 Y15:285 S20 ; Define mesh grid
Most likely you have connected the OUT pin of the sensor to the wrong pin on the Z probe connector (it should go to the IN pin), or there is a bad crimp connection in that wire.
I suspected that yes…since when I measure volt on out and gnd I measure 0.09V and the value drops to 37
I did recrimp the out and it is connected to the in on the duet...........
And I did measure ohm between the underside of the sensor to the underside of the connector on the duet and it is 0 ohm....
I guess it's possible that the OUT pin of your sensor isn't properly soldered to the PCB, although it must have passed testing.
O and it triggers when I get close to the sensor(red led) so yes it must be something with the out signal. See photos for connections
had to solder to the sensor, since I don't have enough space for the connector
solved….R4 on the sensor was badly soldered....soldered both sides and seems to give sensible data 0 when far from bed but always 985 when close...no values in between. Duet detects it as z-stop.
Shouldn't the values vary?
I am glad you solved it. However, both R4 and R5 would have to be open circuit to give the original symptom. So please check R5 too.
Well , the LED worked so R5 is fine. Only out didn't work. But I checked and resoldered R5 and R4 under a microscope and it looks fine now…..C1 is supposed to be not mounted I suppose
R5 doesn't affect the LED, it's R6 that does. R5 is the resistor next to L1. C1 is not mounted.
A indeed sorry… I'll check r5 too