It says on the Arduino Serial reference page that you cannot connect the PC COM port directly to the Arduino as it run on 12v.
I would like to send data from my PC the the RX pin on my board. Are there any easy way to establish this connection? I think I'm covered in regards to the software part.
I'm not interested in using an USB solution.
MrWIT:
It says on the Arduino Serial reference page that you cannot connect the PC COM port directly to the Arduino as it run on 12v.I would like to send data from my PC the the RX pin on my board. Are there any easy way to establish this connection? I think I'm covered in regards to the software part.
I'm not interested in using an USB solution.
The only way is to use an adapter board. The 12 volts from the PC COM is +_ 12 volts and the Arduino cannot live with that. Also, the adapter board will invert the bits so the Arduino TTL can read the data properly.
Paul
The easiest way I know, assuming you have a free USB port, is to buy a USB-to-Serial adapter module like the ones here. This isn't using your COM port, but it does give you a way to exchange serial data between your PC and your board.
Another way is to use a BlueTooth module like this if you have BlueTooth capability on your PC. No cable PC to board!
There are other ways that use a WiFi connection as well (NodeMCU).
Hope that's helpful.
For level conversion... you need this sort of solution... RS232 I/O Module | Schmartboard if you don't want to use USB.
Another consideration is the signal inversion usually associated with a RS232 driver. If you only clamp the signal from the PC to be within the voltage levels of the ardulno you will find the signal is inverted.
If you go on ebay and search for MAX232 you will find a number of cheap boards that will do the job (including the mentioned inversion)
