char serInString[11]; // array that will hold the bytes of the incoming string.
// you need to adjust so it can hold the max values to be expected
// eg if you declared 7 digital in it would be 8 to
// include first id letter and the following 7 H’s & L’s
char serOutString[11];
// array to hold string of arduino read values of digital pin
char anOutString[6];
// array hold output of analog out — not used

int val=0; // temporary value for inputs & outputs
int val4=0; //temp
char val2=2;
char val3=0;
char val1=0;
int p=0; // temporary value for pin
int digout = 8; // start pin for digital out sequence
// here 8-13 will be output and 2-7 will be read in
// can be changed depending on your needs
int digseq = 6; //temp value for number of output pins

//read a string from the serial and store it in an array
//you must supply the array variable
void readSerialString (char *strArray) {
int i = 0;
if(Serial.available()) {
//Serial.print(”reading Serial String: “); //optional: for confirmation
while (serialAvailable()){
strArray[i] = Serial.read();
i++;
// Serial.print(strArray[(i-1)]); //optional: for confirmation
}
// Serial.println(); //optional: for confirmation
}
}

// cleanout the arrays
void cleanup(char *strArray){
for (int i=0; i= 8; i++){
serInString[i]=0;
serOutString[i]=0;
}
}

//Print the whole string at once - will be performed only if thers is data inside it
//you must supply the array variable
void printSerialString(char *strArray) {
int i=0;
if (strArray[i] != 0) {
while(strArray[i] != 0) {
//Serial.print( strArray[i] );
strArray[i] = 0; // optional: flush the content
i++;
}
}
}

//utility function to know wither an array is empty or not
boolean isStringEmpty(char *strArray) {
if (strArray[0] == 0) {
return true;
}
else {
return false;
}
}

void setup() {
Serial.begin(9600);
// digout starts at digout (8 in this example)
for (int i=digout; i <= 13; i++){
pinMode(i, OUTPUT);
}
for (int i=2; i <= digout-1; i++){
pinMode(i, INPUT);
}
}

void loop () {
//simple feedback from Arduino that it is working - optional
//Serial.println("Hello World");

//read the serial port and create a string out of what you read
readSerialString(serInString);

if( isStringEmpty(serInString) == false) {
//it will do the following if there actually is some info

//--------
// "D" = code for digital out to arduino looks for D as first
// character in the input string (ascii 68)
// then looks for H & L letters
// for example computer sends DHLHHLL
if (serInString[0]==68)
digseq= 13-digout+1; // how many output pins

{

for (int i=1; i <= digseq; i++){
p = i+digout-1; // output to the right pins
// for example if output starts at pin 8
// then second item in string will be applied to pin 1+7
val=serInString[i]; // what is the letter
// if it is an H (high - ascii 72- then subtract 71 to make high)
//
// if it is a L (low - ascii 76- then subtract 76 to make low)
if (val == 72)
{
val = 1;
}
else
{
val=0;
}

digitalWrite(p, val);// output to the pin

}
//Serial.println("digoutconfirm");
}

//-------
// "E" (ascii69) = code for read & send arduino digital state to computer
if (serInString[0]==69) // just send an E from computer

{

serOutString[0] =70; // F for return to computer
// read pins from 2 to one below digout
serOutString[1] =65;

for (int i=2; i <= digout-1; i++){
val = digitalRead(i);
if (val == HIGH)
{
//val = digitalRead(i);
//val4=i-1;
serOutString[i-1]=72; //H for high
// Serial.println("high");
}

if (val == LOW)
{
// val = digitalRead(i);
//val4=i-1;
serOutString[i-1]=76; //L for low
// Serial.println("low");
}

}

Serial.print(serOutString);
Serial.println("$");// for end
}

//-----------
// A (asci65) = code for send analog read pins to computer
if (serInString[0]==65)
{
//Serial.println("F");
for (int i=0; i <= 5; i++){
val = analogRead(i);
val2=val/4;
anOutString[i]=val2;
Serial.println(i);
Serial.println(val,DEC);
//Serial.println(val2,DEC); // 1 byte version
}

//Serial.println(anOutString);
Serial.println("$");
}

//----------
// B = code for analog sent to control arduino analog out
if (serInString[0]==66)
{
val1=serInString[1]; //pwm0 - pin9
val2=serInString[2]; //pwm1 - pin10
val3=serInString[3]; //pwm2 - pin11
//Serial.println(val1);
// Serial.println(val2);
//Serial.println(val3);
analogWrite(9,val1);
analogWrite(10,val2);
analogWrite(11,val3);
//Serial.println("anaconfirm");
}

// Serial.println();
}

// Serial.println();
//cleans out arrays
for (int i=0; i <= 11; i++){

serInString[i]=0;
serOutString[i]=0;
anOutString[i]=0;

}
//slows down the visualization in the terminal
delay(200);
}