Limit Sensors Sensors are here and better than ever! As requested I have reduced the size by going SMD. This version is identical to the previous version in all ways except size. The board 35% s...Read More…
Sensors are here and better than ever! As requested I have reduced the size by going SMD. This version is identical to the previous version in all ways except size. The board 35% smaller (15.5 mm x 20.5), most importantly the same easy connect block remains. See the short video of the new version in action.
This is a magnetic sensor (Hall Effect Sensor) designed to be used in place of mechanical limit switches for CNC Routers 3D Printers or any movement control system. They are highly accurate and offer consistent repeatable results with extremely low tolerances.
Hall effect sensors are used for proximity switching, positioning, speed detection, and current sensing applications. In its simplest form, the sensor acts as an on/off switch when it comes in proximity of a magnetic field. In this case the sensor switches on when a magnetic field is present and off when the field is not present.
I designed these switches to be used on my ShapeOko CNC router with the standard GRBL controller (supplied with ShapeOko 1 and 2) they will work on either 3 or 5 volts. These sensors can also be used any where position detection is required such as a lids, windows, doors and anything where position detection is needed. Feel free to ask me about your situation.
The functionality is very simple, when the sensor comes in proximity of magnetic field, the sensor trips, electricity flows between the signal pin and Negative (GND) on the CNC controller. This is exactly what happens with a mechanical limit switch when the lever is pressed. You can simulate this by simply connecting a wire from the sensor pin and the negative pin on any of the ShapeOko controllers. If the Limit setting is enabled, movement will stop the instant the connection is made.
When the sensor trips:
When the magnet is moved away from the sensor the state is reversed:
The sensitivity and precision of the magnetic sensor make it an excellent choice for accuracy and repeatability, especially where tolerances of .001 mm or less are required. The sensor will have no impact to the controller since it require very little power.
Connecting the sensor is very easy there are only three connections. As noted in the picture of the sensor with the wires plugged in
The sensor wire (White) is the wire that sends the alarm state to the controller. Its connected axis alarm pin of the controller. In the case of the Grbl controller that comes with the ShapeOko this would be:
As noted earlier the wires push right into the wire connector, no soldering or crimping. The connection is strong and can easily be released without any damage (see video below). You can use solid or stranded 20 to 26 AWG wire. I recommend 22 AWG stranded wire flexible and easy to push in to the connector.
|Shipping Rate||First item||Additional items|
United States Postal Service: Standard Ground Rate
United States Postal Service: Priority Mail 2-Day
This for up to 20 units (1LB) of the Limit Sensor.
United States Postal Service: Priority Mail Express 1-Day™
Overnight shipping for up to 30 units, about 1 LBS.
Francisco | Sept. 21, 2017
James | July 8, 2017
Frank | May 25, 2017
Erik | April 20, 2017
Michael | Jan. 19, 2017
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I enjoy creating simple solutions for problems that don't seem to have one. I have a long career in the computer industry and the merging of computers, circuit design and 3D printing make for a really fun playground. If I could do this full time I think I would b in heaven.e I started down this road many years ago but products like the Raspberry PI, Arduino and other similar products open a world of opportunities.
I am constantly on the look out for the unique problem that needs a simple solution solution. During this trek I have refined my skill of creating circuits boards with a CNC router. While it will always have room for growth I can quickly create them and each one is better than the last.
I also enjoy doing custom work if you have a circuit that needs a PCB I can help. All I need is a schematic. If you like any of my products but they are either out of stock or not quite what you need. Reach out to me I am happy to make revisions. Who knows other might like them, its all fun to me.