Hi,
I want to get data from serial port, so I used this code to arduino:
int potPin = 0;
void setup()
{
Serial.begin(9600);
}
void loop()
{
int val = map(analogRead(potPin), 0, 1023, 0, 255);
Serial.println(val);
delay(1000);
}
And this code to python:
import serial
ser=serial.Serial(port='COM3',timeout=3)
s=ser.read(100) #reading up to 100 bytes
print s
When I connect the arduino to the serial port, python show 4 values from the serial port. But, if a run the code in python again, occurs this error:
raise SerialException("could not open port %s: %s" % (self.portstr, ctypes.WinError()))
serial.serialutil.SerialException: could not open port COM3: [Error 5] Access denied.
Can you help me?
Thanks