The Creltek Limit Sensor 343RT is a small, surface-mountable hall-effect (magnetic) switch designed for 3D printing, CNC, and other motion control applications. The sensor is "triggered" when brought into proximity with a suitable permanent magnet or electromagnet, and automatically resets when the magnet and sensor are moved apart.
Limit sensors are commonly used in CNC and 3D Printing machines to detect when the spindle or printhead approaches the end of the gantry or axis limit. Hall-effect sensors provide a more robust alternative to traditional mechanical switches, as they can be made impervious to dust, vibration, liquids and moisture, and have no moving parts or contacts that wear out over time.
Any motion control system is a potential candidate for these limit sensors.
When building my own Shapeoko 2 CNC Mill, I was disappointed with the low quality and poor appearance of the various limit switches out there. I wanted something small, unobtrusive, reliable, accurate, and professional-looking. I designed these sensors to meet these goals, and they have exceeded my expectations.
A typical CNC mill or 3D printer will use 6 of these sensors: a "minimum" and "maximum" limit switch for each of the X, Y, and Z axes. I've included a Red/Green LED on each sensor board so you can quickly see when a sensor is triggered, and which one. (Plus it looks pretty cool!)
I recommend using high-quality neodymium magnets with these sensors for most applications. I am offering suitable magnets which can be included as an option when purchasing. These are flat, square 1/2 inch by 1/2 inch N45 magnets 1/8 inch thick. They can be attached to most surfaces using an epoxy putty or other suitable adhesive.
The sensor board comes standard with miniature wire-to-board connectors, designed to accept 26 AWG solid or stranded wire. Wire attachment is easy: simply insert the leads and squeeze down the connector caps with a regular pair of pliers. No stripping, soldering, or special tools required! The wire-to-board connectors extend approximately 3.6 mm above the top surface of the board when crimped down, giving a total device thickness of 5.5 mm or 0.22 inches.
The included wire-to-board connectors work perfectly with standard "flat" 4-conductor telephone line cord, which can be included as an option when purchasing, in a variety of different lengths. It's inexpensive, unobtrusive, flexible, reliable, and easily terminated with standard RJ-11 plugs. An optional RJ-11 Breakout Board supporting up to 8 sensors is also available, and can even be panel-mounted if desired, for a truly professional result!
Also, for your choice and convenience, you can choose to have the RJ-11 plugs pre-crimped to the wiring or not. Note: You'll need an RJ-11 crimp tool if you choose to crimp the plugs on yourself.
Alexander | Oct. 25, 2017
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I'm an avid electronics hobbyist and a talented programmer with a passion for creative problem-solving, design, and systems integration. As a member of the Creltek design group, I enjoy finding elegant solutions to complex problems, and combining hardware and software in new and unique ways. I maintain an extremely wide range of interests, and strive to stay on the cutting edge through constant innovation and application, both at work and during personal pursuit in my free time.
My current electronics research includes LED lighting, resonant high-frequency switching power supplies, embedded systems, multi-core microcontrollers, digital audio and MIDI, and the design of reusable circuit modules for rapid prototyping, research, and development.
My day job involves managing the IT department and teaching at a small private college. You can check out my LinkedIn profile here: https://www.linkedin.com/in/kevpatt
Creltek is a private technology design group engaged in innovative software and hardware integration, research, and development. We strive for high quality and excellence by design. When a member of our engineering team creates a module or tool that might be useful to others, we try to make it available here on Tindie!
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