Search found 7 matches

by markbotics
Thu Mar 12, 2015 3:06 am
Forum: GRBL
Topic: Use of PROBE input as a generic input (without stopping)
Replies: 6
Views: 891

Re: Use of PROBE input as a generic input (without stopping)

Hello, just to follow up on my question. We instead installed a second Uno MCU whose only job it is is to read four input bits (3 buttons on pendant, and our external E-stop flip-flop state). I had an Uno Atmel program from years ago that just spews the status of input pins onto the serial port, and...
by markbotics
Thu Mar 05, 2015 6:17 am
Forum: GRBL
Topic: Use of PROBE input as a generic input (without stopping)
Replies: 6
Views: 891

Use of PROBE input as a generic input (without stopping)

Hello, I need a generic input bit (or two actually) for switches, so our planned custom GUI can read pendant buttons. We're trying to avoid having a "smart" pendant with a microcontroller inside. Without changing the source and recompiling, does anyone know how to use the PROBE input so that it coul...
by markbotics
Thu Mar 05, 2015 6:02 am
Forum: GRBL
Topic: G-code coordinate systems explanation -especially for GRBL
Replies: 9
Views: 5334

Re: G-code coordinate systems explanation -especially for GR

Thank you cvoinescu for that succinct answer. That is the knowledge I was seeking (and probably annoyed the Github people a bit to learn as I bugged them with questions). One first finds the range for each axis for later use with soft limits, enter those 'max travel' numbers in the $130,$131,$132 re...
by markbotics
Mon Mar 02, 2015 11:53 pm
Forum: Geckodrive
Topic: Gecko people
Replies: 6
Views: 2507

Re: Gecko people

So far I've used Geckos on 3 projects. In 2009 we used them on 2 stepper motor projects without problems. Recently I ordered a GM215 and GM201. The GM215 was defective or something odd happened, it worked one day but when I returned the next no longer worked ever again and I returned it. The new one...
by markbotics
Mon Mar 02, 2015 11:38 pm
Forum: GRBL
Topic: Enabling Limit Switches (+ electrical noise on wires)
Replies: 44
Views: 11169

Re: Enabling Limit Switches (+ electrical noise on wires)

Years ago as a kid trying to build robots I was often cursed with motor noise affecting inputs or crashing the microcontroller. This can be made worse if all your digital and power wires have to go through a single cable, as with an underwater ROV project. In that case I used a RS422 transceiver, wh...
by markbotics
Mon Mar 02, 2015 10:00 pm
Forum: GRBL
Topic: G-code coordinate systems explanation -especially for GRBL
Replies: 9
Views: 5334

Re: G-code coordinate systems explanation -especially for GR

Thank you for that link, the "Using the Work Coordinate Systems" section (your http://www.shapeoko.com/wiki/index.php/G-Code#Using_the_Work_Coordinate_Systems) explained it all. My understand of simplest, best practices coord systems is: Think in terms of two coord systems: MCS (Machine Coordinate S...
by markbotics
Mon Mar 02, 2015 8:07 pm
Forum: GRBL
Topic: G-code coordinate systems explanation -especially for GRBL
Replies: 9
Views: 5334

G-code coordinate systems explanation -especially for GRBL

Hello, can someone provide a link or a simple explanation of coordinate systems? Currently I'm motivated by the need to make a reliable homing system for my GRBL based machine we're making. After the homing sequence $h is finished I want the machine to be set to a fixed X,Y,Z. I assume this the "mac...