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Inductive Sensor Kit now available on our store!

Hey everyone, we’re excited to announce that the Inductive Sensor Kit for the LongMill is now available!

As we talked about in our last blog post about the inductive limit switches, we had been waiting on the sensors. While the sensors were shipped out at the end of August/start of September, due to some shipping delays, the sensors took much longer than we expected. They have finally arrived, and we are able to start making and shipping out the kits.

Inductive sensors and gSender

Just a quick thank you to Garrett Fromme ( and Dana Andrews ( who have been our beta testers for the past month and a half. We sent them our first prototypes of the inductive sensor.

During the testing of the sensor system, we found a couple of interesting bugs in GRBL and gSender. First involves the coordinate system. It turns out that GRBL counts the bottom left corner in the negative space. We’ve updated the latest version of the firmware for the LongMill to change this to make it in the positive space, making it more intuitive to use the sensors. You can now update to the latest version of the firmware using the latest version of gSender. Instructions can be found in our resources.

Second is the way that the gcode sender handles moving away from a hard limit. If you were to trigger a hard limit on the machine, the machine would not let you travel in that direction any further. However, since the limit will be triggered continuously and the machine cannot move away from the limit switch, gSender has been updated to allow users to move away from a triggered switch. It is important to note that other gcode senders may not have this functionality built-in, and the sender may need to be restarted or the machine moved manually to stop the trigger.

Ordering your sensors

You can now order the kits directly on our store. We are currently in the process of assembling and packing sensors so that we can ship them to folks as quickly as we can.

What coming next?

While the inductive sensor kit is a bandaid solution to add the functionality to older versions of the LongMill, we are planning on updating the LongMill around the end of this year to provide hard mounting points for inductive sensors. This means that brackets will not be needed to install the sensors.

We will also be adding more functionality and tools to utilize the sensors further through gSender updates.