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EMX 128 - reversed polarity = death ?

Posted 2yr ago
by SFR75 | Junior | 550 exp
Posted 2yr ago
by SFR75 | Junior | 550 exp
Hello,

It looks like the guy, who worked on my prototype project has fried the only working unit I had built!
Apparently he plugged the lipo battery in a wrong way and it fried the board.
Question: is there a protection diode against reverse polarity on EMX 128 board or there is not ?

Sincerely
M
Reply #1 — Posted 2yr ago
by Dave McLaughlin | Legend | 58,471 exp
Reply #1 — Posted 2yr ago
by Dave McLaughlin | Legend | 58,471 exp
SFR75 says:

Question: is there a protection diode against reverse polarity on EMX 128 board or there is not ?

Pretty much doubt it. You should always design into your own project when using modules a reverse protection diode. Well worth the small cost for this.

Even the GHI EMX development board doesn't have any reverse protection.
Reply #2 — Posted 2yr ago
by glx | Senior | 3,332 exp
Reply #2 — Posted 2yr ago
by glx | Senior | 3,332 exp
I assume your board doesn't work anymore Wink so what exactly doesn't work? Maybe "just" a problem of a power source?
Is the module powered directly from the Lipo or could maybe a power supply IC have passed away? Did you check if there is any power delivered to the module?
Reply #3 — Posted 2yr ago
by SFR75 | Junior | 550 exp
Reply #3 — Posted 2yr ago
by SFR75 | Junior | 550 exp
Well he said that "something started to smoke"... whatever that means. So he unplugged the lipo.
I tested it yesterday and components on the unit light up (LCD screen and compass), however
no visible functionality.
And.. when I connect board using USB to computer, the device is not recognized (!) by Fez Config
and doesn't appear as "EMX". Which makes me think that maybe EMX board is dead Sad(
Posted 2yr ago
by steelflex | Newbie | 10 exp
Posted 2yr ago
by steelflex | Newbie | 10 exp
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Posted 2yr ago
by sarahaus | Newbie | 10 exp
Posted 2yr ago
by sarahaus | Newbie | 10 exp
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