Control the L lamp on the arduino via stone lcd code

Other Hardware LEDs and Multiplexing
1

uint8_t buff[9]={0};
void setup()
{
Serial.begin(115200);
pinMode(LED_BUILTIN,OUTPUT);
}
void loop()
{
while (Serial.available() > 0)
{
for(uint8_t i=0;i<9;i++)
{
buff =uint8_t(Serial.read());
Serial.write(buff*);*
delay(2);
}
//digitalWrite(LED_BUILTIN,HIGH);
}
if(buff[8]==1)
{
digitalWrite(LED_BUILTIN,HIGH);
}
else if(buff[8]==2)
{
digitalWrite(LED_BUILTIN,LOW);}}

2

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