This is the exact webiste I got the code from
 http://tushev.org/articles/electronics/48-arduino-and-watchdog-timer
I set the timeout to be 2 seconds and added various timer, like before during and after my sd writes, just to be safe
however when I uploaded it defaulted somehow, a bug that I saw after it happened and I researched more, the only indicator being the led constantly lit as the bootloader constantly runs and resets

And the default wdt time I believe is like 200ms, which is not long enough for ,the bootloader so my mega was basically bricked, until I was able to catch it at just the right time to upload a new program without it, which required alot of time and luck, and I really don't wanna have to get lucky twice

Hey I was wondering what the correct way to use the watchdog timer on a mega2560?
I tried the normal way for say an uno and after finding out that it works, I also found out that the mega2560 has a bug where the wdt time defaults and it eternally resets
I want to use it but, I guess the normal way is not an option for the mega?

Are you using the regular serial port on the ide? If your not using 9600 you need to select which rate on the bottom of the screen, it doesn't automatically know

Same with the shift bckspc,
Very annoying at times, mostly when im editing

Solved it,
found out my breadboard was missing a row,  worked when I put it on another spot lol
simple problem simpel fix
and now my projects coming along nice

Not at the moment, looking into getting one tho
Does the code on that site seem fine?  Its really the only example ive found,  even though its not too complex i figured basically the same code from the datasheet

Hey I have a msgeq7 set up exactly as it is in the datasheet, and I tried code from this website after mine (interpreted from datasheet) failed, http://nuewire.com/info-archive/msgeq7-by-j-skoba/
yet I still don't have any sucess : /
All I read is 804-807 on all the channels
Its not the analog read, I get 0 for ground and 1023 to 5v
I believe the microphone chip is fine, its a module I bought, regardless the output doesn not change connected or not
the only change I get is when I connect the audio in pin directly to ground where I get about 668 value on the analog read
I tried another chip with the same results
all new capacitors, tested my resistors with a multi, both close to spec'd

can anyone help me figure this out? I hate when things don't work when its so simple : /

Just thinking about the ability to change contrast on the fly, not much practical use but for the sake of knowing
thanks, I tried it and it works, no puffs of smoke either, just wanted to see if it was a bad idea

I made a control thing for my car with one with pages and buttons, real nice, except I don't know where I saved the code : /
adafruits touch screen has a nice library where I got all my code from,
simple commands like tft.drawrect(10,10,10
it even had touchscreen library and you basically just map the touch screen to display size and works perfect

Is it possible to control the contrast of an lcd by pwm? I guess it needs a constant voltage which is which a pot is used, but can I put a capacitor of a decent size on the pwm out to create a constant voltage? Any reason why this may be bad?

Diodes would ensure that you are reading dc, depending if you need to know positive or negative, perhaps two separate analog reads off two half bridge rectifier
if it doesn't matter one read off a full bridge rectifier will work
also depending on the voltage scale a resistor voltage divider would be needed, but will decrease accuracy a bit,

U should try it without regulated and see if it works accuratly and well, sometiems its fine and sometimes what you have is enough, just don't forget about it if you are getting glitches that its one possibility to check

Look into an sd module and library

How to send a byte from the computer is all up to the computer program you use, get a usb to serial or the port on the arduino and just send your byte, then interpret it on the arduino, ignoring any non important characters like line feed or whitespaces,
then use some bitwise math to separate the byte into your outputs
the way I have done an identifer is sending a 3 byte package with the pin and state included, like 131 or 130 to turn 13 on(1) or off(0)
take the first two character on the arduino side and convert from their ascii values to decimal, combing the two character into one real number
to do that you

Pinnumber = Incomingbyte1 - 48
Pinnumber = Pinnumber * 10
Incomingbyte2 = Incomingbyte2 - 48;
Pinnumber = Pinnumber + Incomingbyte2;

Remember to. Use a pin lik 3, send 03

Then. To turn on or off
Pinstatus = incomingbyte3 - 48;
PinMode(Pinnumber, output);
digitalWrite(pinnumber,Pinstatus);

This assumes you received the 3 bytes and stored them already

I used this technique and made a library for full control of my mega over serial, digtital and analog input, digital and pwm output,

When u get ur board, you'll see how easy, it says next to every pin
use that number