I need to send some information from my PC to an Arduino. I tested it with PuTTY and it works great.
I need to send characters, '1' or '2', to control a servo and I am using these commands:
mode com10:9600,n,8,1
... and I see that my Arduino received some data.
After that, I try to use that:
echo 1>com10
OR
echo "1">com10
and nothing nothing happens.
With PuTTY it works corrent and turning, when I press 1 or 2. With the Arduino serial monitor it works great too.
What worked for me was, something like:
echo ON > \\.\COM4
echo OFF > \\.\COM4
This link provides some good info.
So, in general, the format to send simple ASCII chars to serial port:
echo [ASCII chars / string you want to send] > \\.\ [Com Port #]
At the end, I used PowerShell to do this task:
powershell "$port= new-Object System.IO.Ports.SerialPort COM10,9600,None,8,one; $port.open(); $port.WriteLine("1"); $port.Close()"
PowerShell is very useful when working with Arduinos, here is a link to a post where I did the same.
I've added a COM port lookup and some error handling to ease the process. Hope this helps someone.
mode com3 BAUD=9600 PARITY=n DATA=8 STOP=1 && echo blahblah > com3
about the same:
powershell "$port= new-Object System.IO.Ports.SerialPort COM10,9600,None,8,one; $port.open(); $port.WriteLine("1"); $port.Close()"
This will send the contents of a file to COM10 under Windows 7, not sure about other versions:
copy myfile \\.\COM10
If you just use "copy myfile COM10" then it creates a file called COM10 instead.
So you might like to try:
echo 1>\\.\com10
Three points:
echo 1>foo is the same as echo >foo which will print ECHO is on. (you're redirecting stream 1, aka stdout).echo "1">foo will print "1" including the quotes.To actually echo a 1 somewhere you'd have to use
>foo echo 1
or
(echo 1)>foo
