BL Touch wont extend

[ejpninja123]

I'm running a duet 2 ethernet with an expansion breakout board. I'm having issues setting up my BL Touch I have it set to use heater 6 on the breakout board and when I use m401 to extend it nothing happens it stays retracted. However when I power off the duet and turn it back on it extends and retracts itself twice and then stays in the retracted state. I am using a genuine BL Touch V3.1. I've tried updating firmware, setting it to heater 7, and I've checked continuity on all my wires all the way to the BL Touch not sure what I am missing. this is my config fileconfig.g

[A Former User]

This post is deleted!

[dc42]

@ejpninja123 you need to change "exp.heater6" in the M950 command in config.g to "!exp.heater6" because the breakout board level shifts the signal to 5V and inverts it.

[ejpninja123]

@dc42 thank you very much it’s extending and retracting I just set a x offset for it now but it doesn’t seem to be accually offsetting the probe when I home it?

[dc42]

@ejpninja123 said in BL Touch wont extend:

@dc42 thank you very much it’s extending and retracting I just set a x offset for it now but it doesn’t seem to be accually offsetting the probe when I home it?

Please explain what you mean.

[ejpninja123]

@dc42 so I have the bl touch offset by 35mm in the x direction but when I put in the offset of either plus or minus 35 in the x direction it does not offset it stays at 0y 0x. In the position it will never see the bed it would just crash the hot end into the table because the sensor is 35mm off the table. Is there something I need to add for an offset during the homing process?

[dc42]

@ejpninja123 said in BL Touch wont extend:

@dc42 so I have the bl touch offset by 35mm in the x direction but when I put in the offset of either plus or minus 35 in the x direction it does not offset it stays at 0y 0x. In the position it will never see the bed it would just crash the hot end into the table because the sensor is 35mm off the table. Is there something I need to add for an offset during the homing process?

What command are you running, that you expect it to apply the offset to?

[ejpninja123]

@dc42 This is my config file. I set it up using the config tool and was expecting it to do the offset for the probe whenever it homes and does mesh leveling but it doesn't seem to be doing any offset at all.config (1).g

[Stephen6309]

@ejpninja123 Homing doesn't use the probe offsets.

Use this to have goto the center of the bed for homing z:

G1 X{((move.axes[0].max + move.axes[0].min) / 2) - sensors.probes[0].offsets[0]}, Y{((move.axes[1].max + move.axes[1].min) / 2) - sensors.probes[0].offsets[1]}, F6000

[ejpninja123]

@stephen6309 got it thanks!