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post #21 of 137 (permalink) Old 04-25-2019, 06:42 PM
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solder like this:

practical question for you guys... where to obtain a 3360 sensor without desoldering? not sure if pixart provides samples or stuff. maybe jkicklighter might be willing to sell a sensor without his pcb.

too busy to check forums as regularly
pm me if i forget to respond
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post #22 of 137 (permalink) Old 04-25-2019, 09:09 PM - Thread Starter
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Quote: Originally Posted by qsxcv View Post
Yup, at least for components with no pads in the middle. For QFN or BGA you need hot air.
Quote:
practical question for you guys... where to obtain a 3360 sensor without desoldering? not sure if pixart provides samples or stuff. maybe jkicklighter might be willing to sell a sensor without his pcb.
There are a few sellers on aliexpress, but I don't know if any of them are official distributors.

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post #23 of 137 (permalink) Old 04-25-2019, 11:27 PM
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I think the official european distributor is here https://www.codico.com/shop/en/pmk3360is-t2qu.html

have to buy a minimum of 5 but still not prohibitively expensive. I put off buying it until more is done, speed is not a priority.
I'll probably buy from aliexpress though, as it's just a one off, though I do have a tindie board which what appears to be a faulty sensor.

I screwed up a ps2 installing a mod chip, I just can't handle those ic packages, wish usb hid came in DIP packages, but I understand impedance would be off and weight would go up.
I was thinking of doing the em11b on flying leads like how the kone xtd encoder is done, except rather than use a cradle, solder a stiff copper wire between each mounting tab, then hinge the wire with vertical wire.

edit: here's where i'm at with the schematic.
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File Type: txt mousefree.sch.txt (35.4 KB, 13 views)

Last edited by gipetto; 04-26-2019 at 05:48 AM.
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post #24 of 137 (permalink) Old 04-26-2019, 12:12 AM
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https://aliexpress.com/item/PMW3360D...834829893.html

PEKA
(20 items)
CPU
i7-6700K @ 4.7Ghz
Motherboard
GA-Z170X-Gaming 7
GPU
Gigabyte GTX 1070 G1 Gaming
RAM
Corsair Vengeance LPX 3200
Hard Drive
OCZ Vertex 4 120GB
Hard Drive
Crucial MX300 525GB
Hard Drive
Seagate Barracuda 2TB
Power Supply
Chieftec APS-650C
Cooling
Corsair H105 + Noctua NF-F12
Case
Corsair Carbide Series Air 540 Black
Monitor
BenQ XL2411T
Keyboard
Vortex Poker II
Mouse
Logitech G Pro Wireless
Mouse
Microsoft Pro IntelliMouse
Mouse
Logitech G900
Mousepad
Artisan FX HIEN XL black
Audio
ASUS Xonar U7
Audio
Sennheiser HD 558
Audio
HyperX Cloud Core
Audio
iPod Classic
▲ hide details ▲
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post #25 of 137 (permalink) Old 04-28-2019, 03:25 AM - Thread Starter
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Update:

Lots of small changes. Got rid of a trace running under the SPI lines and two that were squeezing between the MCU and the sensor cutout. (got rid of the 1.9v enable, and decided to run the LED off the MCU instead of the 1.9v regulator).

Also got USB data lines to the top layer and ground either side.

Maybe an excessive amount of via stitching.

This is all probably completely unnecessary for a one off, but who knows, maybe if I end up selling these someday I'll have to comply with USB and FCC requirements.
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post #26 of 137 (permalink) Old 04-28-2019, 04:28 AM
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I received the sot-23 regulator the day after I ordered it, despite paying little for postage. tbh I regret buying those parts after I saw them, as I thought they were the largest, but soic is larger again. I think if you go for a custom mcu, you should go for an soic package, but that would be different for mass production.
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post #27 of 137 (permalink) Old 04-28-2019, 04:37 AM - Thread Starter
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Yeah, SOIC is easier to solder, but I already want to make that area of the board smaller.

I suppose there's no reason to stick to single sided load for prototyping. That would free up some space for easier to solder components, or just a smaller mouse.

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post #28 of 137 (permalink) Old 05-02-2019, 07:45 AM
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Do you think the mcu would be ok using the internal RC circuit instead of external crystal or is timing super crucial for usb and spi comms.
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post #29 of 137 (permalink) Old 05-02-2019, 09:32 AM - Thread Starter
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Most microcontrollers do need a crystal for USB. This one though is supposed to do clock recovery off the existing signal.

https://www.silabs.com/documents/pub...-datasheet.pdf


Last edited by TranquilTempest; 05-02-2019 at 09:37 AM.
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post #30 of 137 (permalink) Old 05-02-2019, 10:28 PM - Thread Starter
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Well, I've ordered my components. Waiting on the mouse wheel before I order the PCB, because I'll have to take some dimensions off of it. In theory everything should cost about $40~60, but with extras and tools I'm probably going to end up around $300 before I'm done.

Ordered sensors from China, two each of 3360 and 3389.

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custom , modding , mouse , pcb , shell

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