Read data directly from COMx to arduino uno ?

Other Hardware General Electronics
1

hi, is possible read with Serial cable connected to COM1 in PC data directly to arduino uno (tx,rx pins?)

or must have RS232 to TTL shield ?

i send via my SW to com port instructions, and i want read and show it on arduino (lcd display on it)

2

or must have RS232 to TTL shield ?

Yes. The voltages from a real RS232 port will damage the Arduino.

3

A quick & dirty method is this. It doesn't respect the official spec of RS232, but works.

// Per

4

if you connected the Arduino to the PC using the USB cable.. doesnt it propgate as a COM port?

not sure what 'software' you are using (did you mention?)

but I know things like Python..etc can send data out the com port1...

I have used PHP scripts to do so.. but on a Windows machine the communication is only PHP > UNO.. and NOT UNO >> PHP

I made a (Adobe) Flash gui a while back to use as a front end.. which in turn sent data to a php script that dumped the 'instruction' (RGB values) to the UNO to parse and use as needed.