Ruggedize

[charlespax]

Take a look at these designs for reference:

• http://www.ruggedcircuits.com/ruggeduino/
• http://www.industrialshields.com/

[Tsillen]

Only protection that is needed is the usb connector. Over current (polyfuse), over voltage (diodes) and reverse polarity .

http://www.edn.com/design/power-management/4433697/Protecting-against-reverse-polarity--Methods-examined--Part-1

[charlespax]

This is what we have right now. Is it adequate?

ESD suppressors: http://www.littelfuse.com/~/media/electronics/datasheets/pulseguard_esd_suppressors/littelfuse_pulseguard_pgb1_datasheet.pdf.pdf

[Tsillen]

the PTC SMD @ battery charging is excessive. The MCP73831 already limits the current and has thermal protection inside. It looks alright now.

[charlespax]

I put that there in the event of a battery failure. Should it be removed? Want to take this opportunity to file your first issue? :-)

[Tsillen]

You will need to test it in real life if the battery has internal protection (should limit current to max ~2A). When the battery (and internal protection circuit) fails you are fucked anyway ->see fire. I have no idea how labels work here @github. You need to show me on skype :P

[charlespax]

The BL-5C datasheet states the max discharge current is 1200 mA. Not sure if this is limited in the battery or not.

Oh, we already looked into this. See https://github.com/PaxInstruments/t400-electronics/issues/46

Looks like this can be closed. Agree?

[Tsillen]

max discharge current is 1200 mA = max safe discharge current. Does not say anything about limiting. You should really try shorting the battery (whit a low ohm high watt resistor) and check the current change using the scope.

[charlespax]

Will do.