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Raspberry Arduino serial comunication problem
Posted: Sun Mar 23, 2014 10:22 am
by Astenoth
Hi,
I have a simple python script to test the communications between the Raspberry and the Arduino Uno.
In the Raspberry:
Code: Select all
#!/usr/bin/env python
import serial
arduino = serial.Serial('/dev/ttyACM0', 9600)
arduino.open()
arduino.write('D')
arduino.close()
In the Arduino:
Code: Select all
int dia = 9;
int dPWD;
void setup(){
Serial.begin(9600);
pinMode(dia,OUTPUT);
}
void loop (){
if (Serial.available()){
char c = Serial.read();
if (c=='D'){
//dPWD=Serial.parseInt();
analogWrite(dia,255);
Serial.flush();
} else if (c=='E'){
analogWrite(dia,0);
Serial.flush();
}
}
}
When I run the python script the Arduino don't work.
I instaled the Arduino program in the Raspberry and I test the code in Arduino with the serial monitor and it go fine. I think that it is not comunication problem.
Could somebody help me?. I tried it solve a week...
Re: Raspberry Arduino serial comunication problem
Posted: Mon Mar 24, 2014 9:39 am
by Astenoth
Hi
I solved the problem... I founnd the below in Arduino web page...
It is worth noting that the example above will not work on a windows machine; the arduino serial device takes some time to load, and when a serial connection is established it resets the arduino.
I don't understand why... my python script is running in the raspberry and no in windows machine.... but it is solved with:
After the python opened the serial comunication.
Regards
Raul
Re: Raspberry Arduino serial comunication problem
Posted: Mon Mar 24, 2014 9:51 am
by DougieLawson
Have you disabled the serial console on /dev/ttyACM0?
Look in /boot/cmdline and /etc/inittab remove any references to /dev/ttyACM0 and reboot.
Re: Raspberry Arduino serial comunication problem
Posted: Tue Mar 25, 2014 9:36 am
by Astenoth
First thanks.
DougieLawson wrote:Look in /boot/cmdline and /etc/inittab remove any references to /dev/ttyACM0 and reboot.
I reviewed the two files and there are not about ttyACM0.
Regards
Raul
Re: Raspberry Arduino serial comunication problem
Posted: Tue Mar 25, 2014 11:43 am
by DougieLawson
When you connect your Arduino what device appears?
Unplug it.
Plug it back in.
Look at the kernel messages with a dmesg command.
Re: Raspberry Arduino serial comunication problem
Posted: Tue Mar 25, 2014 1:15 pm
by Astenoth
When I connect the new device in the list is:
/dev/ttyACM0
Regards
Raul
Re: Raspberry Arduino serial comunication problem
Posted: Tue Mar 25, 2014 1:21 pm
by DougieLawson
Re: Raspberry Arduino serial comunication problem
Posted: Tue Mar 25, 2014 6:57 pm
by Astenoth
Hi,
I reviewed all them, and all are ok and I updated the raspberry firmware too. But the USB communication go fine with the time.sleep only.
Thanks.
Raul