How uploaded code are save in the arduino?

Other Hardware Storage
1

I have uploaded a sketch to my arduino. If i were to upload another sketch, will it replace the first sketch? or do i have 2 sketches in my arduino?

2
  1. Why u want to upload two code??

I have uploaded a sketch to my arduino. If i were to upload another sketch, will it replace the first sketch? or do i have 2 sketches in my arduino?

yes it will definitely erase your old code.

explain brief what you are trying to do

3

AMPS-N:

  1. Why u want to upload two code??

I have uploaded a sketch to my arduino. If i were to upload another sketch, will it replace the first sketch? or do i have 2 sketches in my arduino?

yes it will definitely erase your old code.

explain brief what you are trying to do

Thank you. Actually i just need 1 code, but then i'm not sure that the new code will replace the old ones. After i uploaded the code, and unplug from my pc, once i put an external power source (battery), the code will run straight away?

4

Yes - after a slight pause if you used a bootloader to install the sketch.
It will start with no delay if you used File:Upload Using Programmer and loaded the sketch via the ICSP header using an In System Programmer (ISP) such as Atmel AVR ISP MKii, or an Arduino that was programmed to act as an ISP.

5

CrossRoads:
Yes - after a slight pause if you used a bootloader to install the sketch.
It will start with no delay if you used File:Upload Using Programmer and loaded the sketch via the ICSP header using an In System Programmer (ISP) such as Atmel AVR ISP MKii, or an Arduino that was programmed to act as an ISP.

Thank you. Is the reset button on the Arduino to erase all the memory?

6

No, the reset button just restarts the processor(*). If a bootloader is installed, it starts, if it detectst that no download is occurring it starts installed sketch. If no bootloader is installed, the sketch starts.

  • applies to '328P and 2560 based boards.
    '32U4 and Due/Yun may do something else, see their Product page.
7

CrossRoads:
No, the reset button just restarts the processor(*). If a bootloader is installed, it starts, if it detectst that no download is occurring it starts installed sketch. If no bootloader is installed, the sketch starts.

  • applies to '328P and 2560 based boards.
    '32U4 and Due/Yun may do something else, see their Product page.

Hi, i want my code to run once, so i put all of it in void setup. If i were to run it again, do i have to re-upload the code or do i have to unplug and connect the power source?

8

ryanlhr:
I have uploaded a sketch to my arduino. If i were to upload another sketch, will it replace the first sketch? or do i have 2 sketches in my arduino?

I think you are trying to learn arduino for the first time. google for some 'introduction to arduino' videos on youtube. Refer to Jeremy Blum arduino tutorials on youtube. You will get a clear idea about what arduino is and what does it do.

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Good advice sumanta_Banerjee.

@ ryanlhr, just press reset, the code will run again.

10

ryanlhr:

CrossRoads:
Yes - after a slight pause if you used a bootloader to install the sketch.
It will start with no delay if you used File:Upload Using Programmer and loaded the sketch via the ICSP header using an In System Programmer (ISP) such as Atmel AVR ISP MKii, or an Arduino that was programmed to act as an ISP.

Thank you. Is the reset button on the Arduino to erase all the memory?

No, reset does not erase any code (flash memory), it just causes a restart of the code.