I posted this as a reply to another thread that had a similar issue but I haven’t seen any replies to that so I think it might have gotten buried. I think it’s a valid enough question to have it’s own thread and might help other people with a similar situation.
I have my arduino connected to a usb hub that is in turn conected to a docking station for a laptop. This laptop is going to have network monitoring software on it that will occasionally retreive the status of a monitor and then take an action on the arduino.
The issue is that I can’t have the com port open all the time - I might dock and undock the laptop multiple times throughout the day. I would like to have the software open a comm port, send a command, and then shutdown to avoid the possibility of leaving a com port in a hung state if I have to undock.
This would lend itself to other projects as well for people who simply need to occasionally establish a connection to the arduino - but would like to avoid the reset issue.
Any help would be greatly appreciated!
The original post:
My setup is:
- Perl using Win32::SerialPort
- Windows XP
- Boarduino with what i suspect is the NG firmware due to a 7 second sketch start delay.
I’ve read on misc threads about shortcutting the reset:
And general perl serial interfacing:
… And I know the Boarduino gives you the option to simply not solder the cap that will tie the reset to the serial but I would prefer to keep that auto reset if I can get away with it via the HUPCL feature I was seeing in some of the linux threads. I suspect that i should be able to do the same thing with the Windows Com Port setup (Set RTS on Close?)
The project I’m looking to create is basically a street light with LED’s that will show the current state of my network / monitored infrastructure. A scheduled task will run occasionally and go and retrieve the state of a monitor, that monitor will return something like, “Normal, Warning, Danger” or whatever to the program. Based on that I want to turn around, open a serial connection on the Boarduino, and change the color of the LED to the appropriate green, yellow, red, and then disconnect since this will most likely be running off of a laptop, which might at anytime be undocked, and I would like the board to simply keep it’s last known state. I saw another project that did it with the OneWire:
but I would like to do the same thing with the Arduino technology. Any help or tips would greatly appreciated.