http://www.cplusplus.com that's where I looked it. But I guess I miss understood it. 'Process/function/loop all the same.' But what does exit do in Arduino or GCC, what assembly code it creates. I wonder why does GCC not know that embedded cpu has no OS to exit. (And give an error.)

I tried to exit a loop with exit. Like this.

Code:

  if (vara>171)
    {
    Dacout0(vara);
    exit;
    }

It did not work. Break works, so there is not a problem but I'm curious. I looked up the word Exit in C++ web references and it is there and there are no errors from compiler either.

True.

With those copy protect bits direct copying is not too easy.

The problem is in "if it works". I would not like to test it here. Besides there will be new CPUs, they may use different registers and so on.

But I found this:
Sleep during ADC conversion
http://www.gammon.com.au/forum/?id=11488

I hope it works.

Does it run in Arduino? I mean are those include files you use in Arduino IDE too?

Hi

I found some examples of code in the forums about shutting down the CPU to minimise noise. Those samples and posts were a bit old. From 2010 and earlier. What is the latest info about doing this.

My board is crowded and because of that PWB wiring is not optimal. We have got +-4,,,+-8 counts of noise in the results.

Regards
Leif

No you wont but if you have a windows machine you can reach your own. I mean it is in Arduino directory already if you have installed it.

Thanks

I just uploaded a simple skecth to my Mega processor. And it worked. I had some difficulties getting it working, I could not find all the sw and settings. So I list the links to them here to help people finding them.

I burnt them with AVR studio and AVRISP2, because that combination worked here.

Processors
Atmega2560 with Arduino bootloader
Atmega 16U2 with firmware

Bootloader for Atmega2560
C:\Program Files\arduino-1.0.1\hardware\arduino\bootloaders\stk500v2\stk500boot_v2_mega2560.hex

Firmware for Atmega 16U2
https://github.com/arduino/Arduino/blob/master/hardware/arduino/firmwares/Arduino-COMBINED-dfu-usbserial-atmega16u2-Mega2560-Rev3.hex
(click RAW)

Fuse settings for Atmega2560
http://arduino.cc/forum/index.php/topic,119782.msg901524.html#msg901524

fuse settings for Atmega 16u2
http://arduino.cc/forum/index.php/topic,96706.0.html

I hope this helps, and of course if there are errors, write a message

I input voltages must within certain limits. Even if you measure their difference. And your Arduino and your voltages must have a common ground so that you can tell(measure) what the voltages are.

If those voltages are too much for Arduino you can use an instrumentation amplifier for that. It is a special chip to make voltage differences to start from ground. Like 11V and 12.23456V becomes 1.23456V.
Leif

I remember old glowing wire 7-segment displays. They did look good, but in use they burnt out their segments, so I hope you can easily change your lamps/segments when they burn out.

I tried to send some keystrokes to a new Mega2560 clone. I got an IOexception from java.

java.io.IOException: Input/output error in writeArray
   at gnu.io.RXTXPort.writeArray(Native Method)
   at gnu.io.RXTXPort$SerialOutputStream.write(RXTXPort.java:1124)

Clip
Clip

   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
   at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)

There is a problem in this board, but what and where. The mega16U2 seems to work, it looks like a serial port in Device manager. And the main Cpu is working also, I can program it with the Avrisp. Its serial output is working too.

I think the problem is in Mega16U2. But it has its firmware inplace. What else?

I see.

I have try that reset pin. I managed to program the 2560 with AVRstudio and AVRISP2, so this is not so urgent any more.

If the original poster has problems with electronics, it is best to use module or or whatever previous poster suggested.

Good questions.

I know that there is somethingg working in the USB chip, because now there is a COM port in the PC. And the devicelist shows something like 2560.

When I wrote a short test program/sketch, all went fine until IDE started to download that into the Arduino board. That download would newer finish

Almost

For instance you start you computer by setting S to active (that may be 0 or 5V depending your circuit) and your computer turn it off by setting R active. By the way, I said wrong it is better to use PNP transistor like BC558 or BC640 and so on. When you use PNP correctly, you connect /Q to base.

But I am not going to design this for you, see Google.