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I can't figure out why the next script is not working. I have attached the Arduino to one USB port of the raspberry pi, in which I've installed pyserial. I just want to turn off/on a led depending of the number I write on the Raspi console (1-> on, 2-> off).

    int led=13;void setup(){  Serial.begin(115200);  pinMode(led,OUTPUT);}void loop(){  if(Serial.available()){         mode(Serial.read() - '0');    }}  void  mode(int n){    if (n== 1){         digitalWrite(led,HIGH);    }        if (n== 2){        digitalWrite(led,LOW);         }     }

PS: I double checked and the baudrate is configured also at 115200 at the raspi side.In addition, if I place digitalWrite(led,HIGH) just before the line "mode(Serial.read() - '0');" the led turn on when I send some information from the raspi shell (so, works well).

askedMay 2, 2014 at 16:51
Seitam's user avatar
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1 Answer1

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Finally I've found the error, it was the serial communication baud rate: 115200. It seems that at higher speeds it not works properly, lowering it to 9600 do the trick.

answeredMay 3, 2014 at 8:11
Seitam's user avatar
2
  • 1
    Have you also tried other rates that worked (or not) between 9600 and 115200 bauds?CommentedMay 3, 2014 at 11:55
  • That is weird. Anyone know why that's happening?CommentedMay 3, 2014 at 14:18

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