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  1. #49
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    Default Re: 3D Probe - Tri-balls type accuracy & DIY

    I do like the way you have joined the top and the bottom parts.

    The trouble with SMDs is that they come on reels ...

    Cheers
    Roger



  2. #50
    Member dharmic's Avatar
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    Default Re: 3D Probe - Tri-balls type accuracy & DIY

    Not only on reels, Roger - rsonline, element14, mouser, digikey, altronics and Jaycar all sell strips of small quantities cut off the reel. Pretty handy for one-offs and RS (much as I love to hate their pricing) seems to have gotten better, especially when they will ship TNT to you door next day for free regardless of order amount. And yes, I've taken delivery of a single $2 thyristor before



  3. #51
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    Default Re: 3D Probe - Tri-balls type accuracy & DIY

    Yeah, on strips too - but a lot of my stock is on reels.
    Err - I got them for free...
    And yes, I too have an RS account.

    Cheers
    Roger



  4. #52
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    Default Re: 3D Probe - Tri-balls type accuracy & DIY

    Really doesn't take much to be exited sometimes lol Look who just shown up!

    Fairly happy with the accuracy (deliveries are as per gerber). The only downside is... everything is minuscule and requires microscope work later on.
    You'll noticed from the vias I've temporarily moved the mosi/miso/sck pads on the back side, for that prototype only. Ideally this should be on top and accessible in a prod probe. Again, if this tri-ball probe type screams the max required <0.02mm I'll then give it my best shot on the V2.0 and design a final pcb. Possibly with IR comm ;-)

    I'll get this kit reflow this evening and run switching/timing tests on it as soon as its got its vcc live!

    Attached Thumbnails Attached Thumbnails 3D Probe - Tri-balls type accuracy &amp; DIY-3dprobe_v1-01_pcb-jpg  


  5. #53
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    Default Re: 3D Probe - Tri-balls type accuracy & DIY

    I think some of you were waiting to see how those balls sets in the PCB and how good of a job that solder paste/reflow did sitting those balls dead flush and solid.

    Pretty happy with the result and now anxious moving to the next step(s) -assembly! I'm out of town between Thurs and Friday so I won't have time but I'll try to keep a few hours dedicated to the home shop this weekend.

    Done. Chip is flashed and alive! Time to probe.. I guess

    Attached Thumbnails Attached Thumbnails 3D Probe - Tri-balls type accuracy &amp; DIY-3dprobe_v1-01_pcb_top-jpg   3D Probe - Tri-balls type accuracy &amp; DIY-3dprobe_v1-01_pcb_bot-jpg   3D Probe - Tri-balls type accuracy &amp; DIY-3dprobe_v1-01_ball_paste_top-jpg   3D Probe - Tri-balls type accuracy &amp; DIY-3dprobe_v1-01_ball_paste_bottom-jpg  

    3D Probe - Tri-balls type accuracy &amp; DIY-3dprobe_v1-01_mcu-jpg   3D Probe - Tri-balls type accuracy &amp; DIY-3dprobe_v1-01_pcb_led-jpg  


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    Default Re: 3D Probe - Tri-balls type accuracy & DIY

    Oh you gotta be happy with that



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    Default Re: 3D Probe - Tri-balls type accuracy & DIY

    Looks nice. That is one bright LED.
    I was curious how you wired everything up so I was looking at the traces. Did you mean to put the 1k resistor in series with the LED? Cause it looks like PB2 is driving the LED anode directly. If your LED has an integrated resistor this will work great, however if it doesn't you may have some trouble programming the UC with the LED installed or the driver for that pin will burn out.



  8. #56
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    Default Re: 3D Probe - Tri-balls type accuracy & DIY

    Quote Originally Posted by dharmic View Post
    Oh you gotta be happy with that
    Ridiculously small set-up, but feels as big as the sun lol

    Just tested it with a 'home-made shank/probe' (hmm) and it is pretty damn sensitive (OD0.5mm music wire spring). The feeling I'm having is... this will end up being way below 0.01. More like 5um or less.
    Not yet done making that test jig where I'll have it fixed to test the accuracy e.g. by pushing on the ball with a micrometer on one side and measuring the motion with 1um resolution mitutoyo digital indicator on the other side.
    I'll have the 360deg data plotted. I'll report as soon as this comes in.

    (waiting for that Renishaw 50mm probe tip... not sure what takes so long for the vendor to let it go. Maybe if I complain here it'll go faster!)


    @Max - got the 1k in circuit for both the led and the pin so it shouldn't pull much. You think that'll be an issue? I'll place the 1k on the LED's gnd leg in V1.2... just to make sure lol
    (you successfully petrified me when I read the word 'burn'. Well spotted btw, unfortunate the silly mistakes you can do when doing 120 different things at the same time. I blame it of those testpoints... if you'd look at how I've wired this in the schematic you'd understand where that mistake came from, routing late a night neither help. Fixed, thanks)

    Attached Thumbnails Attached Thumbnails 3D Probe - Tri-balls type accuracy &amp; DIY-3dprobe_v1-01_trace-jpg   3D Probe - Tri-balls type accuracy &amp; DIY-3dprobe_v1-01_led_gnd-jpg  
    Last edited by Mecanix; 08-27-2019 at 08:53 PM.


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    Default Re: 3D Probe - Tri-balls type accuracy & DIY

    Mistakes on Electronics is so easy. It is always good to have a second pair of eyes reviewing a design.
    You could use a LED with an integrated resistor. https://www.digikey.com/products/en?...s=WP710A10ID5V
    One less component requiring space.



  10. #58
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    Default Re: 3D Probe - Tri-balls type accuracy & DIY

    Quote Originally Posted by maxspongebob View Post
    Mistakes on Electronics is so easy. It is always good to have a second pair of eyes reviewing a design.
    You could use a LED with an integrated resistor. https://www.digikey.com/products/en?...s=WP710A10ID5V
    One less component requiring space.
    I didn't do mistakes?! the software did(lol). I manually route my circuits (normally) but for this little guy I've pressed the auto-route button thinking "bah there are only 3 wires". It didn't liked the testpoints for some reason. You know, I'm just the guy with the solder iron, gotta love auto-routing.

    Another one you didn't spot (yet!) is the floating pin for the probe switch. That's easy to get going for the prototype by just enabling the chip's internal pull-up, but none the less, another auto-route/testpoints grande. I'll get that fixed in the V1.2. Perhaps V1.3 from the look of things LOL

    Never seen or worked with an integrated R led, interesting, I'll have a look



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    Default Re: 3D Probe - Tri-balls type accuracy & DIY

    Quote Originally Posted by Mecanix View Post
    Another one you didn't spot (yet!) is the floating pin for the probe switch. That's easy to get going for the prototype by just enabling the chip's internal pull-up, but none the less, another auto-route/testpoints grande. I'll get that fixed in the V1.2. Perhaps V1.3 from the look of things LOL
    I can’t think of a reason I wouldn’t just use the internal pull-up if there is one, especially on a design where real estate is limited.



  12. #60
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    Default Re: 3D Probe - Tri-balls type accuracy & DIY

    Quote Originally Posted by dharmic View Post
    I can’t think of a reason I wouldn’t just use the internal pull-up if there is one, especially on a design where real estate is limited.
    Hope you guys will be around to help when we'll put in the LORA comm, or IR, or that wheatstone bridge for that strain gauges array... because those tri-balls didn't cut it at the end. That'd be funny... not lol

    Anyway. All up for inputs or even criticism. You guys are top class, thanks again!!!



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