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Post by Big Man Black T-Shirt(Patrick) on Aug 15, 2017 5:52:24 GMT
I just finished making my own hall effect sensor home/limit switches, here's my proof! Schematic of the Comparator board and the sensor boards. (My sensor boards MUST be connected to my Comparator board in order to work. If you want to build your own sensor boards without using a Comparator board you will need to find a schematic that shows that circuit.)  |
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Post by aforww on Aug 15, 2017 6:13:54 GMT
Ok. So, knowing little beyond that they are used for proximity sensing and the like, why in this application? I mean, compared to the switches and proximity sensors currently available?
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Post by Big Man Black T-Shirt(Patrick) on Aug 16, 2017 4:33:05 GMT
Ok. So, knowing little beyond that they are used for proximity sensing and the like, why in this application? I mean, compared to the switches and proximity sensors currently available?  I wanted to add hard limit switches, and I didn't have any, but I did have the components to build my own hall effect sensors. (I'm an electronics nerd with a lot of components, PCBs, wiring, etc.) I actually bought 3 hall effect sensor boards from eBay for $2 each. They worked OK but were active HIGH, and the GRBL shield wants active LOW, so I decided to build my own.
Plus, the sensors I bought, and all the ones I see online that other CNC guys have designed, didn't allow me to drill holes and feed only the sensor itself and the LED through the MDF, which is what I decided I wanted to do. So I built my own. So in a word, customizability. |
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Post by aforww on Aug 16, 2017 4:49:29 GMT
Ok. So, knowing little beyond that they are used for proximity sensing and the like, why in this application? I mean, compared to the switches and proximity sensors currently available? They worked OK but were active HIGH, and the GRBL shield wants active LOW, so I decided to build my own.
Plus, the sensors I bought, and all the ones I see online that other CNC guys have designed, didn't allow me to drill holes and feed only the sensor itself and the LED through the MDF, which is what I decided I wanted to do. So I built my own. So in a word, customizability. Right on. I use soft limits which is awesome besides GRBL and UGS still having issues with the reset. If they are tripped you can't do a soft reset you have to shutdown UGS to clear it. After a few trips they just make you more aware of work area limits. |
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I wanted to add hard limit switches, and I didn't have any, but I did have the components to build my own hall effect sensors. (I'm an electronics nerd with a lot of components, PCBs, wiring, etc.) I actually bought 3 hall effect sensor boards from eBay for $2 each. They worked OK but were active HIGH, and the GRBL shield wants active LOW, so I decided to build my own.