Search found 7 matches

by dBc
Mon Nov 12, 2012 12:21 am
Forum: EtherMega
Topic: EtherMega and other SPI devices
Replies: 0
Views: 2109

EtherMega and other SPI devices

I've found several references claiming that the W5100 can share the SPI with other devices, particularly on Freetronics Ether products, because they obey SS better than the stock ether shields. That sounds good on the h/w side. But having a poke around in the standard Ethernet/W5100 library code, I'...
by dBc
Sun Aug 05, 2012 8:05 am
Forum: EtherMega
Topic: Watchdog timer bricked my ethermega (Solved)
Replies: 2
Views: 8268

Re: Watchdog timer bricked my ethermega

I've read about bootloaders needing to be compatible with the watchdog before and put off enabling it because I didn't fully understand the problem. Hopefully someone here might know the answer.... Your call to: wdt_enable(WDTO_2S); only enables the watchdog timer until the next power cycle right? S...
by dBc
Sat Jun 09, 2012 11:51 pm
Forum: EtherMega
Topic: What is the maximum current I can draw from 5v pin
Replies: 8
Views: 7826

Re: What is the maximum current I can draw from 5v pin

Thanks Jon. So I'm trying to decide between leaving the jumper in USB setting or leaving it out completely. I have a 5V 3A regulated wall-wart wired directly to the EtherMega's 5V pin and nothing connected to the USB port. But every once in a while (new features or bug fixes) I'll rock up with my la...
by dBc
Thu May 24, 2012 8:36 am
Forum: EtherMega
Topic: What is the maximum current I can draw from 5v pin
Replies: 8
Views: 7826

Re: What is the maximum current I can draw from 5v pin

Thanks for the detailed response, that all makes lots of sense. One more question. I have a 5V regulated wall-wart rated for 3A that I want to use on an EtherMega project, that includes 8 * 5V relay coils like the original posters, but like him, I don't expect to be lighting up more than about 4 at ...
by dBc
Wed May 23, 2012 10:01 pm
Forum: EtherMega
Topic: What is the maximum current I can draw from 5v pin
Replies: 8
Views: 7826

Re: What is the maximum current I can draw from 5v pin

That is impressive. When you say "switchmode controller" I assume that means it doesn't use the standard linear regulators that most boards use? Does this mean I can draw more 5V amps than I'm supplying 12V amps through the DC jack? And does it mean the higher the voltage supplied to the DC jack the...
by dBc
Mon May 21, 2012 5:17 am
Forum: EtherMega
Topic: ethermega fried, standard mega works, same code.
Replies: 3
Views: 2705

Re: ethermega fried, standard mega works, same code.

While we're on the topic of power: 1. when powering from an external 7-12V supply, what's the most current I can draw from the EtherMega's 5V pins? (and assuming the answer to that is smaller than what I need).... 2. if I get a regulated 5VDC supply, can I feed that straight into the GND/+5V pins, a...
by dBc
Sun May 20, 2012 10:50 pm
Forum: EtherMega
Topic: Blink works, but nothing else
Replies: 2
Views: 2739

Re: Blink works, but nothing else

A nasty gcc-avr bug in 4.5.3 (and others) takes out Ethernet comms. It's a real pain when old projects stop working because you've updated your toolchain. Your device will still respond ok to pings (since they're handled on-chip) but not much else. If you're doing Arduino Ethernet work, you might wa...