////////////////////////////////////////////////////////////////////////////////
// Name:       ESP01-2                                                        //
// Platform:   Arduino Uno V3                                                 //
// Created by: HARB, June 2016, GPL copyrights                                //
// http://robotigs.com/robotigs/includes/parts_header.php?idpart=238          //
// Connect ESP-01 to your Arduino:                                            //
// Yellow = Arduino RX1 = ESP-01 TX                                           //
// Blue   = Arduino TX1 = ESP-01 RX                                           //
// While uploading: disconnect yellow AND blue from the Arduino.              //
////////////////////////////////////////////////////////////////////////////////

// SET PRECOMPILER OPTIONS *****************************************************
  // Include the needed header files for the precompiler, no charge if not used-
  //#include <WiFiEsp.h>          //https://github.com/bportaluri/WiFiEsp HEADER

// Define precompiler variables ------------------------------------------------
  bool   ledOnBoardVal = LOW;    //You choose HIGH-on or LOW-off for LED_BUILTIN

//Declare variables ------------------------------------------------------------
  String inStri = "No answer received";  

// Define PINS -----------------------------------------------------------------
  //Define the needed header files for the precompiler, no charge if not used --
//END OF PRECOMPILER OPTIONS ---------------------------------------------------

void setup() { //Setup runs once ***********************************************
  disable_jtag();         //Disable jtag to free port C, enabled by default JTAG
  pinMode(LED_BUILTIN, OUTPUT);          //Arduino boards contain an onboard LED
  Serial.begin(115200);             //Nothing more needed for the SERIAL MONITOR
  Serial1.begin(57600);                                             //WIFI ESP01
  Serial1.setTimeout(5000);                      //1000 = default for WIFI ESP01
  readESP01();                                      //Empty serial buffers ESP01


  Serial.println("Test if AT system works correctly: ");    //General test ESP01
  Serial1.println("AT");                      //Send the AT command to the ESP01
  readESP01();                                     //Receive data from the ESP01
  Serial.println(inStri);                    //Show answer at the SERIAL MONITOR

  //Serial.println("Restart ESP01: ");                 //Reset to defaults ESP01
  //Serial1.println("AT+RST");                //Send the AT command to the ESP01
  //readESP01();                                   //Receive data from the ESP01
  //Serial.println(inStri);                  //Show answer at the SERIAL MONITOR

  Serial.println("Print firmware version: ");            //Firmware of the ESP01
  Serial1.println("AT+GMR");                  //Send the AT command to the ESP01
  readESP01();                                     //Receive data from the ESP01
  Serial.println(inStri);                    //Show answer at the SERIAL MONITOR

  Serial.println("Lists all valid modes: ");        //Modes of Wifi on the ESP01
  Serial1.println("AT+CWMODE?");              //Send the AT command to the ESP01
  readESP01();                                     //Receive data from the ESP01
  Serial.println(inStri);                    //Show answer at the SERIAL MONITOR

  Serial.println("Lists available Access Points: ");        //Networks for ESP01
  Serial1.println("AT+CWLAP");                //Send the AT command to the ESP01
  readESP01();                                     //Receive data from the ESP01
  Serial.println(inStri);                    //Show answer at the SERIAL MONITOR

  Serial.println("Test if AT system works correctly: ");    //General test ESP01
  Serial1.println("AT");                      //Send the AT command to the ESP01
  readESP01();                                     //Receive data from the ESP01
  Serial.println(inStri);                    //Show answer at the SERIAL MONITOR
  
  Serial.println("Set to slower communication rate: ");      //General set ESP01
  Serial1.println("AT+UART_DEF=57600,8,1,0,0");      //Send command to the ESP01
  readESP01();                                     //Receive data from the ESP01
  Serial.println(inStri);                    //Show answer at the SERIAL MONITOR
  
  Serial.println("Test if AT system works correctly: ");    //General test ESP01
  Serial1.println("AT");                      //Send the AT command to the ESP01
  readESP01();                                     //Receive data from the ESP01
  Serial.println(inStri);                    //Show answer at the SERIAL MONITOR
}//--(end setup )---------------------------------------------------------------


void loop() { //KEEP ON RUNNING THIS LOOP FOREVER ******************************
  toggle_ledOnBoard();                    //Toggles the LED_BUILTIN on-board LED
  readESP01();                                      //Empty serial buffers ESP01
  Serial.println(inStri);                    //Show answer at the SERIAL MONITOR
  delay(10000);                       //You can test your own patience here WAIT
} //End of void loop()                       //KEEP ON RUNNING THIS LOOP FOREVER


void readESP01(void){ //Receive and proces data from the ESP01 *****************
  delay(10);                                    //Give some time to answer ESP01
  inStri = "";                                       //Reset receive string WIFI
  while (Serial1.available() > 0) {        //Check if any request available WIFI
    inStri = inStri + Serial1.readString();     //Read incoming characters ESP01
    delay(500);             //Give some time to retreive data from the net ESP01 
  } //End of if (Serial1.available() > 0)       Entire block has been read ESP01
  if (inStri == "") {                          //Check if any error is made WIFI
    inStri = "No answer received";     //Default answer if nothing received WIFI
  } //End of if (inStri <> "")                   Check if any error is made WIFI
} //Exit readESP01 -------------------------------------------------------------


void toggle_ledOnBoard(void){ //Toggles the LED_BUILTIN on-board LED ***********
  ledOnBoardVal = !ledOnBoardVal;                                 //Toggle value
  digitalWrite(LED_BUILTIN, ledOnBoardVal);     //Set Arduino boards onboard LED
} //Exit toggle_ledBin ---------------------------------------------------------


void disable_jtag(void) { //Disable jtag to free port C, enabled by default ****
#if defined(JTD)                           //Not all AVR controller include jtag
  MCUCR |= ( 1 << JTD );                                //Write twice to disable
  MCUCR |= ( 1 << JTD );                                       //So stutter once
#endif                                            //End of conditional compiling
} //Exit jtag_disable ----------------------------------------------------------


////////////////////////////////////////////////////////////////////////////////
// PIN ALLOCATIONS TABLE ARDUINO MEGA 2560                                    //
// Board  -Atmel- PIN - IDE - Function          - External Connection    FUNC //
//                                                                            //
// CONNECTIONS RAILS TOP LEFT: DIGITAL PWM<~> ******************************* //
// SCL    -  28 - PC5 -19/A5- ADC5/SCL/PCINT13  - DS1307 SCL orange       TWI //
// SDA    -  27 - PC4 -18/A4- ADC4/SDA/PCINT12  - DS1307 SDA white        TWI //
// AREF   -  31 - REF -     - AREF              -                         REF //

// 13 PWM -  26 - PB7 -  13 - OC0A/OC1C/PCINT17 - LED Arduino LED_BUILTIN PWM //
// 12 PWM -  18 - PB6 -  12 - OC1B/PCINT16      -                         PWM //
// 11 PWM -  17 - PB3 -  11 - MOSI/OC2A/PCINT3  -                         PWM //
// 10 PWM -  16 - PB2 -  10 - SS/OC1B/PCINT2    -                         PWM //
//  9 PWM -  15 - PB1 -   9 - OC1A/PCINT1       -                         PWM //
//  8 PWM -  14 - PB0 -   8 - PCINT0/CLK0/ICP1  -                         DIO //
//                                                                            //
// CONNECTIONS RAILS TOP MIDDLE: DIGITAL PWM<~> ***************************** //
//  7 PWM -  13 - PD7 -   7 - PCINT23/AIN1      -                         PWM //
//  6 PWM -  12 - PD6 -   6 - PCINT22/OCA0/AIN0 -                         PWM //
//  5 PWM -  11 - PD5 -   5 - PCINT21/OC0B/T1   -                         PWM //
//  4 PWM -   6 - PD4 -   4 - PCINT20/XCK/T0    -                         PWM //
//  3 PWM -   5 - PD3 -   3 - PCINT19/OC2B/INT1 -                         PWM //
//  2 PWM -   4 - PD2 -   2 - PCINT18/INT0      -                         INT //
//  1 TX0 -   3 - PD1 -   1 - PCINT17/TXD       - Serial monitor          TX0 //
//  0 RX0 -   2 - PD0 -   0 - PCINT16/RCD       - Serial Monitor          RC0 //
//                                                                            //
// CONNECTIONS RAILS TOP RIGHT: DIGITAL PWM<~> ****************************** //
// 14 TX3 -  13 - PD7 -   7 - PCINT23/AIN1      - Activ buzzer orange     DIO //
// 15 RX3 -  12 - PD6 -   6 - PCINT22/OCA0/AIN0 -                         PWM //
// 16 TX2 -  11 - PD5 -   5 - PCINT21/OC0B/T1   -                         TX2 //
// 17 RX2 -   6 - PD4 -   4 - PCINT20/XCK/T0    -                         RX2 //
// 18 TX1 -   5 - PD3 -   3 - PCINT19/OC2B/INT1 - Transmit to ESP01 blue  INT //
// 19 RX1 -   4 - PD2 -   2 - PCINT18/INT0      - Rec from ESP01 yellow   INT //
// 20 SDA -   3 - PD1 -   1 - PCINT17/TXD       -                         TWI //
// 21 SCL -   2 - PD0 -   0 - PCINT16/RCD       -                         TWI //
//                                                                            //
// CONNECTIONS RAILS BOTTOM LEFT: POWER ************************************* //
// 5V     -   7 - VCC -     - VCC               -                         VCC //
// RES    -   1 - RES -     - PCINT14/RESET     -                         RES //
// 3.3V   -     -     -     -                   -                             //
// 5V     -     -     -     -                   -                             //
// GND    -     -     -     -                   -                             //
// GND    -     -     -     -                   -                             //
// Vin    -     -     -     -                   -                             //
//                                                                            //
// CONNECTIONS RAILS BOTTOM CENTER: ANALOG IN ******************************* //
// A0     -  23 - PC0 -A0/14- ADC0/PCINT8       -                         ADC //
// A1     -  24 - PC1 -A1/15- ADC1/PCINT9       -                         ADC //
// A2     -  25 - PC2 -A2/16- ADC2/PCINT10      -                         ADC //
// A3     -  26 - PC3 -A3/17- ADC3/PCINT12      -                         ADC //
// A4     -  27 - PC4 -A4/18- ADC4/SDA/PCINT12  -                         TWI //
// A5     -  28 - PC5 -A5/19- ADC5/SCL/PCINT13  -                         TWI //
//                                                                            //
// CONNECTIONS RAILS BOTTOM RIGHT: ANALOG IN ******************************** //
// A08    -  89 - PK0 -     - ADC1 4/PCINT?     -                         ADC //
// A09    -  88 - PK1 -     - ADC15/PCINT?      -                         ADC //
// A10    -  87 - PK2 -     - ADC14/PCINT?      -                         ADC //
// A11    -  86 - PK3 -     - ADC15/PCINT?      -                         ADC //
// A12    -  85 - PK4 -     - ADC14/PCINT?      -                         ADC //
// A13    -  84 - PK5 -     - ADC15/PCINT?      -                         ADC //
// A14    -  83 - PK6 -     - ADC14/PCINT22     -                         ADC //
// A15    -  82 - PK7 -     - ADC15/PCINT23     - LDR purple              ADC //
//                                                                            //
// CONNECTIONS RAILS QUER RIGHT ********************************************* //
// Board  -Atmel- PIN - IDE - Function          - External Connection    FUNC //
// 32     -  58 - PC5 -     - DIO               -                         DIO //
// 44     -  40 - PL5 -     - OC5C              - 3 Color led Red         PWM //
// 45     -  39 - PL4 -     - OC5B              - 3 Color led Blue        PWM //
// 46     -  38 - PL3 -     - OC5A              - 3 Color led Green       PWM //
// 47     -  37 - PL2 -     - T5                - DHT22 one-wire white    DIO //
// 48     -  36 - PL1 -     - ICP5              - Relais 1 purple         DIO //
// 49     -  35 - PL0 -     - ICP4              -                         DIO //
// 50     -  22 - PB3 -     - MISO/PCINT3       -                         SPI //
// 51     -  21 - PB2 -     - MOSI/PCINT2       -                         SPI //
// 52     -  20 - PB1 -     - SCK/PCINT1        -                         SPI //
// 53     -  19 - PB1 -     - SS/PCINT0         -                         SPI //
// 54     -     - GND -     - GND               -                         GND //
// 55     -     - GND -     - GND               -                         GND //
////////////////////////////////////////////////////////////////////////////////
//345678911234567892123456789312345678941234567895123456789612345678971234567898
// EEPROM MEMORY MAP:                                                         //
// Start End  Number Description                                              //
// 0000  0000      1 Never use this memory location to be AVR compatible      //
////////////////////////////////////////////////////////////////////////////////
//345678911234567892123456789312345678941234567895123456789612345678971234567898
////////////////////////////////////////////////////////////////////////////////
// FUSES (can always be altered by using the STK500)                          //
// On-Chip Debug Enabled: off                            (OCDEN=0)            //
// JTAG Interface Enabled: off                           (JTAGEN=0)           //
// Preserve EEPROM mem through the Chip Erase cycle: On  (EESAVE = 0)         //
// Boot Flash section = 2048 words, Boot startaddr=$3800 (BOOTSZ=00)          //
// Boot Reset vector Enabled, default address=$0000      (BOOTSTR=0)          //
// CKOPT fuse (operation dependent of CKSEL fuses        (CKOPT=0)            //
// Brown-out detection level at VCC=2,7V;                (BODLEVEL=0)         //
// Ext. Cr/Res High Freq.; Start-up time: 16K CK + 64 ms (CKSEL=1111 SUT=11)  //
// LOCKBITS (are dangerous to change, since they cannot be reset)             //
// Mode 1: No memory lock features enabled                                    //
// Application Protect Mode 1: No lock on SPM and LPM in Application Section  //
// Boot Loader Protect Mode 1: No lock on SPM and LPM in Boot Loader Section  //
////////////////////////////////////////////////////////////////////////////////