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Brett's Arduino 8x Smart Charger / Discharger
#91
(10-11-2018, 06:25 PM)brettwatty Wrote:
(10-11-2018, 08:50 AM)unclebob Wrote: Hi Brett,

Just ordering the last parts for the charger, just wanted to check the 7v power - do you know the amp draw needed? is 1A enough ? and also the barrel pin, + in the inside or outside? I believe i have a version 2 board?

Hi, I would recommend 7V 2A as the RoboyDYN Mega has Low Dropout Voltage Regulators so the lower you get the better. I you are using a computer PSU you could use a buck or boost (depending on whet voltage you connect to) then you can tune it in to the lowest voltage input it will work with. 

Cheers,
Brett

Because I wanted to use my cooling fan at it's rated 12V, I supply 12V to the DC jack and used a buck converter to down convert 12V to feed the logic 5V on the board, thus bypassing the RobotDyn's 5V reg.  It's just dangling on it's wires at the moment, need to fix it securely somehow.
It also makes it handy that I can use an old computer PSU, dedicating it's 5V rail to only supplying the TP4056's.

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#92
New design 4x 18650 Arduino Nano. Still need to print and test the board.
I will post the schematic and PCB once tested.
Korishan and CrankyCoder like this post
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#93
Its a bit difficult to find 7v 2a uk plug charger, so ive ended up getting a 12v 15A psu, and two buck converters - one i can set to 7v and the other to 5v. hopefully 15A should be sufficient to cover the board, plus hopefully a bit extra for a fan or two if needed.

Good work on the nano board - though haven't got round to building my full board yet - stopped processing cells till the board is ready then do them all though there for consistency!

by my calcs i need 40 watts for the chargers (5 v *1a * 8 chargers), + 14w (7v@2a ) for the controller,

which totals 54 watts, on a 180watt psu... should be more then enough, should i go for a 12v 8a, or 10a instead?
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#94
Cool video brettwatty!

So is this using the same parts, but for 4 cells instead of 8?
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