Force reset of Arduino mega 2560

Using Arduino General Electronics
1

Hello forum,

I was looking at some old posts and I wanted to ask a few questions because I was unable to reply to those posts. I am trying to find a way to force reset my Arduino without unplugging the Usb cable. I found that I could either cut the Vcc on the Usb cable so that when I remove the external power supply it will not be powered by the usb cable. I also found that I can remove F1 on the Arduino which should work similarly to cutting the Vcc on the Usb cable just that way it seems like I would have less issues with the voltage drop in the cable. I just wanted to double check with everyone to make sure it works before I drastically change my set up.

Thank You

2

also is there some way that the rs232 could be reset inside the code?

3

You can use the watchdog timer for forced reset.

4

would the command

wdt_enable(WDTO_2S)

work so it would give the code a 2 second time out and it could reset the board

5

after further research the watchdog timer will not reset communication with the rs323 on the arduino mega. Any other ideas?

6

setup();

7

could you please expand on this?

8

Use it as a "line of code" - you're calling the setup function.
Isn't that what you're trying to do ?

9

No, I am trying to remotely reset communication with the rs232. either through code or modifying my board so that once the 5v external power is removed I can leave the usb connected without having power on the board to reset the rs232.

10

Seems different from what you posted originally --

11

sorry new information has come to me since I posted I would still appreciate your help with this.

12

What's that supposed to mean? Spare us the use/misuse of jargon.

13

I am trying to reset the Arduino similarly to how it would be reset if the usb and external 5v power were to be removed. I will not be able to remove the usb because of where the Arduino is located with my project. I cannot use the reset button on the Arduino because that will not reset the rs232.

14

Arbitrarily?

Put an HC06 and send a "command" to 'Reset' where it will call the setup() function.
Too weird ?

15

Hi, @mbanks

Have you tried it?

Why do you need to reset RS232?

Tom... :smiley: :+1: :coffee: :australia:

16

Use a terminal emulator program that lets you control the DTR and RTS lines
Toggle DTR to do a reset

17

Found my solution from the forum here

I was able to remove T1 so that once I disconnected the external power the Arduino shut off with maintaining communication.