/*============================
/ Connect ColorPAL SIG signal to Arduino pin 2 and 3
/ Add 2K pullup resistor from pins 2 & 3 to +5v
/ Baud Rate = 9600 kbps
/ Read signal on 9600 in HEX
/============================
#include <SoftwareSerial.h>
SoftwareSerial Color90(2, 3); // rx = 2, tx = 3
int red;
int grn;
int blu;
float redCorr;
float bluCorr;
float grnCorr;
int gotcolor = 0;
int letter;
void setup()
{
Serial.begin(9600); // Start communication with serial port read value
Color90.begin(4800); // Send signal to led to read value
pinMode(2,INPUT); // serial pin out from color pal
pinMode(3,INPUT); // from same serial pin, signal pulls up, sends, pulls down, reads
digitalWrite(2,HIGH); // Enable the pull-up resistor
digitalWrite(3,HIGH); // Enable the pull-up resistor
pinMode(2,OUTPUT); // send signal out
pinMode(3,OUTPUT);
digitalWrite(2,LOW); // turn pin off so pin 3 can go high
digitalWrite(3,LOW);
pinMode(2,INPUT); // Input signal to print
pinMode(3,INPUT);
Serial.println("Pass 1");
// delay(20);
while( digitalRead(2) != HIGH || digitalRead(3) != HIGH ) {
Serial.println("In the loop");
delay(50);
}
Serial.println("Pass 2");
pinMode(2,OUTPUT);
pinMode(3,OUTPUT);
digitalWrite(2,LOW);
digitalWrite(3,LOW);
delay(100); // spec is 80, but not all ColorPAL units work with 80
pinMode(2,INPUT);
pinMode(3,OUTPUT);
delay(100);
}
// This oscillates back and forth on one wire to turn off led, send signal,
// turn on led, read signal. very fast strobe read - arduino is not capable of
// one wire signal communication over digital ports, so this is a way around
// that over 2 wires communicating with 1 pin on the sensor.
//----------------------------
void loop()
{
readcolor();
Serial.print("R");
Serial.print(redCorr);
Serial.print(" G");
Serial.print(grnCorr);
Serial.print(" B");
Serial.println(bluCorr);
gotcolor = 0;
delay(100);
}
void readcolor() { // Reads ColorPAL, putting results in the red,grn,blu variables
char rByte[9];
char dummy[4];
delay(20);
Color90.begin(4800);
Color90.print("= (00 $ m) !"); // set up loop to continuously send color data
pinMode(3,INPUT);
gotcolor = 0;
while (gotcolor == 0) {
rByte[0] = Color90.read();
if( rByte[0] == '$' ) {
gotcolor = 1;
for(int i=0; i<9; i++) {
rByte[i] = Color90.read();
// Serial.print(rByte[i]);
}
Serial.println("");
dummy[0] = rByte[0];
dummy[1] = rByte[1];
dummy[2] = rByte[2];
dummy[3] = 0;
red = strtol(dummy,NULL,16);
dummy[0] = rByte[3];
dummy[1] = rByte[4];
dummy[2] = rByte[5];
grn = strtol(dummy,NULL,16);
dummy[0] = rByte[6];
dummy[1] = rByte[7];
dummy[2] = rByte[8];
blu = strtol(dummy,NULL,16);
bluCorr= (((float)blu-37.)/(505.-37.));
grnCorr= (((float)grn-20.)/(271.-20.));
redCorr= (((float)red-24.)/(304.-24.));
}
}
}
