Homework 2
The idea is to be able to change the color of the LEDs from the console. Consists of two parts. A python code which sends the string while Arduino code which parses the string a lights up the LEDs.
Arduino code
char input[100];
int green = 9;
int blue = 10;
int red = 11;
int greenValue;
int redValue;
int blueValue;
boolean changed;
void setup()
{
pinMode(green, OUTPUT);
pinMode(blue,OUTPUT);
pinMode(red,OUTPUT);
Serial.begin(9600);
changed= false;
analogWrite(green,127);
analogWrite(blue,127);
analogWrite(red,127);
Serial.println("enter color command (e.g. 'r043g098b089') :");
}
void loop()
{
memset(input,0,100);
readSerialString(input);
if(changed)
{
Serial.print(input);
char valRed[4], valGreen[4], valBlue[4];
int grenValue, blueValue, redValue;
valRed[0] = input[1]; valRed[1] = input[2]; valRed[2] = input[3]; valRed[3] = '\0';
valGreen[0] = input[5]; valGreen[1] = input[6]; valGreen[2] = input[7]; valGreen[3] = '\0';
valBlue[0] = input[9]; valBlue[1] = input[10]; valBlue[2] = input[11]; valBlue[3] = '\0';
redValue = (valRed[0] - '0') * 100 + (valRed[1] - '0') * 10 + (valRed[2] - '0');
greenValue = (valGreen[0] - '0') * 100 + (valGreen[1] - '0') * 10 + (valGreen[2] - '0');
blueValue = (valBlue[0] - '0') * 100 + (valBlue[1] - '0') * 10 + (valBlue[2] - '0');
Serial.print(redValue);
Serial.print(greenValue);
Serial.print(redValue);
analogWrite(green,greenValue);
analogWrite(blue,blueValue);
analogWrite(red,redValue);
}
delay(100);
}
void readSerialString (char *strArray) {
int i = 0;
if(!Serial.available()) {
changed = false;
return;
}
while (Serial.available()) {
strArray[i] = Serial.read();
i++;
changed = true;
}
}
Python Code
import serial
import sys
def SendData(string,port,baudrate):
ser = serial.Serial(port, baudrate, timeout=1)
ser.write(string)
ser.close()
if __name__ == "__main__":
SendData(sys.argv[1],'/dev/ttyACM0',9600)
