Simple Script controlled by Raspberry not working

Question

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).

Answer 1

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.

• jfpoilpret: Have you also tried other rates that worked (or not) between 9600 and 115200 bauds?
• asheeshr: That is weird. Anyone know why that's happening?