sorry that pic is not an hr33, this is
On Mon, Jun 8, 2020 at 11:02 AM Chris Albertson <albertson.ch...@gmail.com> wrote: > > I am going to have JLPCB make some PCBs for me. They cost only $2 each but > DHL shipping from China is $25 so it makes sense to wait until I have > several projects ready and give then a batch of designs. They populate the > board now for the price of the components, so it is a great deal. They do > all the SMT soldering for you. > > Two things might interest people here, a USB connected pendant and a > hardware switch debouncer. > > The switch debouncer will handle 6 switches, it accepts a raw switch and > outputs a reliably debounced signal. It will use an RC lowpass filter and > a 74HC014 Schmitt trigger. With an LED for each switch. Yes, you can do > the debounce in software but this will handle the noise with hardware. I'm > still deciding about connectors. Screw terminals or JST? Or both. > > The pendant is more complex and I'm not sure of the details but here are > proposed features: > > - It will connect with USB. > - There are three knobs. All are of the continuous rotation type with > A/B quadrature output. > - The main knob is a CNC "MPG" handwheel with 100 "clicks" per > revolution. > - The other two are much smaller with about 20 clicks per > revolution and also a push-button click operation, like on a car radio. > These two knobs replace the more common selector switches. > - There is a character-only LCD screen that can display four lines of > text, 20 characters long > - There are no labels printed on the front panel. The current function > of the two small knobs is displayed on the last line of the LCD > > The goal is first off a "clean look" with both low complexity and > open-ended design. I think using a character display and rotary controls > does this. This pendant could run a 6 axis robot arm or a lathe depending > on the programming. > > *One question: Does a pendant need a "activate" button* on the side such > that the controls are disabled if you don't hold the button down. You > don't want to jog a mill by accident if the wheel is bumped. > > I'm making this for myself but I'm designing this as if it were an actual > product. So I ask "What would be useful? > > I've decided I don't like the idea of a standard red E-Stop button because > someone might confuse it with the hard-wired kind. USB can not support > that. But I do want a way to quickly stop the machine. I think pressing > both small knobs at the same time will stop and re-set everything. It will > set the e-stop hal pin and reset the pendant to default. (Yes e-stop could > fail if there is a bug in the software) > > [image: Simple Pendant v2.jpg] > > > > > > > > > Chris Albertson > Redondo Beach, California > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users
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