4 replies to this topic

[BanksySan]

Hi, I may have bricked my N+. But I'm not sure what I did wrong. Currently, when I power via USB the power dies within seconds. I was trying Stefan's WiiChuck demo, so was powering off 3.3V and had Analogue 4 & 5 plugged in. I wanted to power the LCD screen next, so I plugged in a power source to the jack. The power supply says: MODEL:ADS-18C-12 0918GPB INPUT: 100-240V-50/60Hz MAX:0.6A OUTPUT: 9V 2.0A The CPU got very hot so I unplugged everything, let it cool down and then looked at it again, It will power via the jack now but when the USB lead is plugged in the light turn on, but fade out within a second. Could someone tell me what happened? I thought I was within tolerances, was power being drawn from both the USB and the jack? Thanks all Dave EDIT: It seems the WiiChuck was plugged in backwards. The N+ doesn't like that at all, I assume it shorts the 3.3V pin. it is powering fine off the USB again now. Phew. Can you tell me if those specs sound OK for the external power supply though? the 2.0A worries me a bit.

[Nevyn]

MODEL:ADS-18C-12 0918GPB
INPUT: 100-240V-50/60Hz
MAX:0.6A
OUTPUT: 9V 2.0A

Can you tell me if those specs sound OK for the external power supply though? the 2.0A worries me a bit.

They look OK to me. The output voltage is in range for the power jack. The block is also capable of supplying more current than necessary so the Netduino should not tax the supply. What you should find is that although the power supply is capable of supplying 2A, the Netduino will only draw the current it needs to operate.


Regards,
Mark

[Stefan]

EDIT:

It seems the WiiChuck was plugged in backwards. The N+ doesn't like that at all, I assume it shorts the 3.3V pin.

it is powering fine off the USB again now. Phew.

Can you tell me if those specs sound OK for the external power supply though? the 2.0A worries me a bit.

I hope, by plugging in everything correctly, all do work fine now?

As Nevyn told you, the high amount of amperes is no problem at all. It's a maximum the power supply can deliver. Amperes aren't pushed, they're pulled. So if the Netduino only pulls 0.5A, it will only use 0.5A.

[BanksySan]

Aye, when it was plugged in the correct way around it worked fine. Still, I don't know why the CPU nearly went into meltdown though. Shorting the 3.3V pin would have just caused the auto resetting fuse to trigger. Stefan, When you did this, did you run both the WiiChuck and the LCD screen off the 'duino? The 3.3V & the 5V pin? Just thinking that, that might have been drawing too much. It's clutching at straws though.

[Stefan]

When you did this, did you run both the WiiChuck and the LCD screen off the 'duino? The 3.3V & the 5V pin? Just thinking that, that might have been drawing too much. It's clutching at straws though.

Yep. Although I used a 3V3 LCD I believe.