I have a major issue but I don't know what it is

Projects General Guidance
1

Hello All,

Sorry about the most non descriptive title but in order to articulate my problem I'm going to have to type a lot and the title isn't really the place to do that. Anyhoo here's my problem;

I have an Arduino Mega2560 with an Ethernet shield. Attached are two relay boards (YWRobot), four channels each. So I upload this code (attached) and one of two things happen;

  1. I go to the web interface and I can turn some of the pins on and off. But when I hit one of
    the pins (constantly changes) it stops the web interface and I hear the chime down from
    my PC.

  2. I upload the code and the PC just starts chiming down continuously as if it were stuck in a
    chime down loop.

Just to clarify, when I say chime down, that's like when you pull the USB cable out of the PC and it "chimes down." I've replaced both the Mega2560 as well as the Ethernet shield both at the same time, and I've even tried disconnecting the relay boards.

So any help would be greatly appreciated. Please speak in laymen's terms in your response as I'm not very good at coding. I downloaded this code off the Internet and made a few changes so it suits me.

2

Sorry all, here is the code. For some reason it didn't attach in the original post.

My Code.ino (30.2 KB)

3

How are the coils of the relay board powered? You might be using too much 5V current and browning out the 5V line, causing the Mega's 16U2 to disconnect from USB.

4

I did it three ways, first I just used the PC's USB cable to power it up. Then I used a 9 volt battery (new), then I used a 12 volt power supply.

5

Okay, I've been at this all day yesterday, all night into today. I'll sleep soon but I found the problem! In short, it was a bad SD card in the Ethernet shield. A long time ago I plugged the SD card in and added the code for it but haven't done anything with it yet because I was focused on other areas. Sorry for the premature post but I guess that's what it took for me to find the problem :o Thanks for your help.