Each pin on the micro-controller is mapped to perform a certain operation. The pins of a micro-controller are called General Purpose Input Output (GPIO) pin.
The following mapping helps us in programming the board. Dx indicates Digital Pins while Ax indicates Analog pins:
To make programming simpler, we can create a config.h file where all the pin-outs are mapped to their usage in the board.
/*
* config.h : A configuration file to map pinouts in micro:Xbot
*
* At VEEROBOT, we invest time and resources providing this open source code,
* Please support VEEROBOT and open-source hardware by purchasing products
* from us @ http://veerobot.com
* -----------------------------------------------------------------------------
* You are free to redistribute it and/or modify it under the terms of the GNU
* Lesser General Public License as published by the Free Software Foundation,
* either version 3 of the License, or (at your option) any later version.
*
* This Code is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* See <http://www.gnu.org/licenses/>
*/
#ifndef _CONFIG_H
#define _CONFIG_H
#define STX D2 // Software Serial Tx Pin
#define SRX D3 // Software Serial Rx Pin
#define EN1 5 // Motor 1 PWM Pin
#define EN2 6 // Motor 2 PWM Pin
#define IN1 4 // Motor 1 Direction Pin
#define IN2 7 // Motor 2 Direction Pin
#define LDR1 A6 // Right LDR Sensor
#define LDR2 A7 // Left LDR Sensor
#define IRRX 8 // IR Receiver
#define BUZZ 9 // Buzzer Output
#define LED_BUILTIN 10 // LED Pin
#define TRIG 11 // Trigger Pin for Sonar
#define ECHO 12 // Echo Pin for Sonar
#define RGB 13 // RGB LED Output
#define LF1 A0 // Right IRRX Module
#define LF2 A1 // Center IRRX Module
#define LF3 A2 // Left IRRX Module
#define BV A3 // Battery Voltage Pin
#define SDA_PIN A4 // Right LDR Sensor
#define SCL_PIN A5 // Left LDR Sensor
#define MAX_DISTANCE 500 // We will use this for maximum Sonar distance
// We will use the below enum to define different RGB Colours
enum RGBColor { UNDEF, RED, ORANGE, YELLOW, GREEN, BLUE, PURPLE, WHITE, BLACK };
#endif // _CONFIG_H
