not able to send incomingBytes to my Arduino Mega 2560 from my terminal [antegros linux 64 bit]

lionelflores · 11-17-2016, 06:51 PM

Hi,

I'm running antegros linux on my desktop computer and am working on my arduino mega 2560 board through the serial port.

I have my arduino board programmed to where start a sequence when it recieves the incomingByte 'r'. when I send the 'r' via "serial monitor" tool on the arduino IDE program it works fine.

If I run the following command through my terminal nothing happens.

echo r > /dev/ttyACM0

But when I run

sudo echo r > /dev/ttyACM0

it works only the first time (even after I reset my arduino). I have to restart the computer for the command to work again.

I'm stuck I need to fix it to where it works with out the sudo for a script.

dab1414 · 11-18-2016, 12:18 PM

Quote:

Originally Posted by lionelflores

I'm stuck I need to fix it to where it works with out the sudo for a script.

You probably need to add your user to group dialout

Code:

sudo usermod -a -G dialout MY_USER_NAME

Quote:

it works only the first time (even after I reset my arduino). I have to restart the computer for the command to work again.

Probably just have to reset your serial port, check this out
http://www.question-defense.com/2009...ys0-ttyam0-etc

lionelflores · 11-18-2016, 09:20 PM

Quote:

Originally Posted by dab1414

You probably need to add your user to group dialout

Code:

sudo usermod -a -G dialout MY_USER_NAME

Probably just have to reset your serial port, check this out
http://www.question-defense.com/2009...ys0-ttyam0-etc

I tried this but got the message

"usermod: group 'dialout' does not exist"

Here are the groups I am part of: sys tty lp wheel uucp lock scanner users

dab1414 · 11-19-2016, 07:08 AM

Quote:

Originally Posted by lionelflores

"usermod: group 'dialout' does not exist"

Sorry about that, I guess its been awhile since I used the serial port. But a little digging later and looks like it is probably uucp group. So not sure why its not working but here is some links with info that might help you troubleshoot this.
http://tldp.org/HOWTO/Serial-HOWTO.html
http://www.oreilly.com/openbook/linag2/book/ch04.html
https://www.cyberciti.biz/faq/find-o...ith-setserial/
https://wiki.archlinux.org/index.php...serial_console