On Fri, Nov 15, 2024 at 08:31 PM, Stan Dye wrote:
Is that trace to narrow/thin for the higher charging current?? I would consider replacing it with a piece of wire to prevent another burn...
On Sat, Nov 16, 2024 at 11:05 AM, <me@...> wrote:
As we discover issues, I am updating the companion pcb design. I have added 750 ohm resistor as Dirk suggested, increased track width to 2mm, added a circuit to bring the control of a bypass button to atmega.
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Sardar,
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Are those 2mm traces 1oz (.035mm) or 2oz thick (.070mm) copper? I'm planning to take Stan's advice and see if I can rewire all the high current BMS/battery connections on the PCB I damaged without creating too much of a rat's nest. I'd like to approximate the current carrying capability of your board update.
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Given the cost of jlcpcb shipment I would accumulate more changes before ordering,
Agreed but Black Friday is coming and I think you mentioned JLCPCB typically has specials so, if it's possible to accumulate a good number of changes, based on our continued testing, I might be able to place an order at a good price for the 25+ followers of this thread who have said they'd like to build your project too!
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I have four PCB sets remaining. I think I will build one with the minimum components populated on the ATU, ATU Mount, and Companion boards needed to test programmed chips with an Arduino and breadboard, as you suggested. I might also install some of the optional ATU switches and LEDs and an LCD display I have on hand for continued ATU config experimentation. That means I can send out three of these first PCB sets to others who are willing to learn with us and help! These first run PCBs are still very usable. The JP302 rework to cut-out the speaker audio when using the audio jack is trivial to accomplish, as is Dirk's optional 750 Ohm resistor.
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I further suspect the traces on these boards don't fully need additional wire supplementation for increased BMS/battery current handling, as long as BMS charging is done with a current-limited regulated supply or with a manually managed supply voltage, which is needed to preserve battery life anyway, but my add-on wires might turn out to be easy to install too.
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73,
Cal (AD8Q)
