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power

Posted: Mon Apr 13, 2015 2:45 pm
by koos147
I received my first arduino a few day's ago and have finally time to experiment

the first few things i tried was to use the ethernet or the micro sd card when it was powered by the computer
when this wasn't working i started to read the manual page and found that this was a commonly problem

so i used a usb charger that supplied 5,2V and this was working.
i was searching for a adapter and found a 9V 1A and a 5V 1A
both power the etherten but didn't start the network
as soon as i connect the usb charger everything starts working again.

now i read some issue's about people that connect 2 power supplies at the same time and i disconnected everything as soon as possible


can someone explain how i can power my etherten the right way?
my final idea is to use the DIY PoE with a 12V power supply

Re: power

Posted: Mon Apr 13, 2015 9:53 pm
by andrew
You can use the USB charger or cable from a PC for non-Ethernet use, however the 9V 1A to the DC socket will be good for all use. Check the polarity of the plug (centre pin should be positive) and that it is in fact giving out 9V with a multimeter.

A 5V supply into the DC socket doesn't have enough voltage.

Re: power

Posted: Tue Apr 14, 2015 12:39 pm
by koos147
that was something i should have done myself
the adapter gave something around 0.5 and 1.5 volt so that one is broaken

how about the DIY PoE
can i just put 12V on the wires and connect the 2 jumpers or do i need something of a voltage regulator?

Re: power

Posted: Tue Apr 14, 2015 9:47 pm
by andrew
If you have a regulated 12v you can send it to the DC socket or Vin and GND pins.

Re: power

Posted: Thu Jul 23, 2015 1:21 am
by cspencer
I just stumbled across this post.

I've created a RFID Reader board that I've been using to communicate to a windows service via TCP network when a RFID tags is read (I've installed approx 50 Etherten's all powered by a 5V 1Amp USB charger over the last 18-24mths ) without any power/network issues all running 24/7 fine. At a new site we have just installed another 16 in the same configuration but they are having issues with networking dropping out, both from the sending of data to the server and the Etherten's network status lights not coming on or taking 10-20 mins before a link to the switch is established, but network comms never come up. The longer the network cable to the switch the worse it behaves. It's fine via USB with 1m patch lead straight to the switch, but when they run it via approx 20m of CAT5 problems arise. (The network cabling has been tested and rated for 1Gbit speeds)
johnb wrote:You can use the USB charger or cable from a PC for non-Ethernet use.
Could you explain why you suggest not to power via USB if your using network.

With the latest failure, I'd tried using a 6V 2AMP supply via the DC Socket (I know it should be 7V+ but I was out of the office when they called me and I took guess), it works ok (with a short network cable to the switch) but after running for a few hours the network drops out and never recovers

I firstly had the Ethernet.begin in the void setup() and the delay in establishing the link meant it would never start.

then in the void loop() I put the same Ethernet.begin code if the connection to the windows machine fails,it checks connection every 10 seconds and after 5 failed, it restarts calls Ethernet.begin

I'm now getting really weird stuff (I'm using WireShark to capture network traffic) and see the Etherten trying to connect to the Server (TCP port 5557)

sometimes from 0.0.0.0 and sometimes from the static address 192.168.1.210
First try after Ethernet.begin connection from .1.210 then from 0.0.0.0 until it restarts again

Is this all stemming from using USB power? Is there any issue running 12V DC 24/7 the regulator seems to get really hot after a few minutes.

I don't have a 9V supply.

Re: power

Posted: Thu Jul 23, 2015 2:58 am
by andrew
USB doesn't offer enought current for reliable use, 7~12V DC via the onboard regulator is the optimal solution - or Power over Ethernet.