gistfile1.txt

/* ************
*  Simple code to listen for serial data and turn LEDs on appropriately.
* I've split the code into "walk" and "turn" functions to give an idea 
* of how to use it for a hexapod, but we just use LEDs hooked up to 
* pins 6 and 7 for this.
*
* Software License Agreement (BSD License)
*
* Copyright (c) 2014 Jai Cornes (tyggerjai@gmail.com). All rights reserved.
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* - Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* - Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
*************** */

int control_byte;
char ser_data;

#define LED1 6
#define LED2 7

void stop_walking(){
// Turn off both LEDs
	digitalWrite(LED1, LOW);
	digitalWrite(LED2, LOW);
}

void start_walking(){
// Turn on both LEDs
	digitalWrite(LED1, HIGH);
	digitalWrite(LED2, HIGH);

}

void turn( int direction){
	if (direction == 1){
	// Turn on one LED
		digitalWrite(LED1, HIGH);
		digitalWrite(LED2, LOW);
	
	}else if (direction == 2){
	//Turn on the other LED
		digitalWrite(LED1, LOW);
		digitalWrite(LED2, HIGH);
	
	}
}

void setup(){
	pinMode (LED1, OUTPUT);
	pinMode (LED2, OUTPUT);
    stop_walking()
    
	Serial.begin(9600);
}

void loop(){

// Check for incoming data
	if (Serial.available() > 0 ){

	// The PC ultimately sends strings "1", not byte values
	// So we need to convert back to a number
		ser_data = Serial.read();
		control_byte = atoi(&ser_data);

		// If it's 1 or 2, turn appropriately
		if (control_byte == 1 || control_byte == 2){
			turn(control_byte);
		}else if (control_byte == 3){
		// Start
			start_walking();
		}else{
		// Stop
			stop_walking();
		}
	

	}
	// Feedback on what we think we got
	Serial.println(control_byte, DEC);
}