ESP32 ArduinoCore Interface – Basic Example

Use

• Serial communication is used to print messages to the serial monitor.
• GPIO pins are used to control an LED and read the state of a button.
• A timer interrupt is used to toggle the LED state and print a message at regular intervals.

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Serial (UART Communication) Interface

Required Hardware and Software

• Arduino IDE (Arduino Core for ESP32 )
• ESP-WROOM-32 Development Kit

Connection Diagram

• Just Connect ESP32 module with PC using USB cable

Code of printing Strings

/*
 http://esp8266iot.blogspot.in/
 http://aruneworld.blogspot.com/
 Tested By  : Arun(20170219)
 Example Name : AEW_ESP32_HelloWorld_UARTSerialCommunication.ino
*/

void setup() {
 Serial.begin(115200); // You can Change the Baudrate 
}
 
void loop() {
 Serial.println("ArunEworld");
 Serial.println("ESP32 Tutorials : Hello World");
 Serial.println("[********************************]");
 delay(2000); //2 sec delay
 
}

Output

ArunEworld
ESP32 Tutorials : Hello World
[********************************]

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Get ESP32 Chip ID

Note : You can use  arduino example code instead of below code because both are same  (File > Example > ESP32 > ChipID

uint64_t chipid;  

void setup() {
 Serial.begin(115200);
}

void loop() {
 chipid=ESP.getEfuseMac();//The chip ID is essentially its MAC address(length: 6 bytes).
 Serial.printf("ESP32 Chip ID = %04X",(uint16_t)(chipid>>32));//print High 2 bytes
 Serial.printf("%08X\n",(uint32_t)chipid);//print Low 4bytes.

 delay(3000);

}

Output

ets Jun  8 2016 00:22:57

rst:0x1 (POWERON_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
ets Jun  8 2016 00:22:57

rst:0x10 (RTCWDT_RTC_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
configsip: 0, SPIWP:0x00
clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
mode:DIO, clock div:1
load:0x3fff0008,len:8
load:0x3fff0010,len:160
load:0x40078000,len:10632
load:0x40080000,len:252
entry 0x40080034
ESP32 Chip ID = EC5502A4AE30
ESP32 Chip ID = EC5502A4AE30

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GPIO Interface (LED, Buzzer)

LED-Blink Using Loop_Delay

Connection Diagram

Code

• https://github.com/adalurarun/Embedded_System/blob/master/MicroController/Espressif/ESP32/Arduino%20Core/Examples/LED/AEW_LED-Blink_Loop_Delay.ino

Note: You can use Arduino example code instead of below code because both are the same  (File > Example > Basic > Blink

/*
  Blink
  Turns on an LED on for one second, then off for one second, repeatedly.

  Most Arduinos have an on-board LED you can control. On the UNO, MEGA and ZERO 
  it is attached to digital pin 13, on MKR1000 on pin 6. LED_BUILTIN is set to
  the correct LED pin independent of which board is used.
  If you want to know what pin the on-board LED is connected to on your Arduino model, check
  the Technical Specs of your board  at https://www.arduino.cc/en/Main/Products
  
  This example code is in the public domain.

  modified 8 May 2014
  by Scott Fitzgerald
  
  modified 2 Sep 2016
  by Arturo Guadalupi
  
  modified 8 Sep 2016
  by Colby Newman
*/


// the setup function runs once when you press reset or power the board
void setup() {
  // initialize digital pin LED_BUILTIN as an output.
  pinMode(23, OUTPUT);
}

// the loop function runs over and over again forever
void loop() {
  digitalWrite(23, HIGH);   // turn the LED on (HIGH is the voltage level)
  delay(1000);                       // wait for a second
  digitalWrite(23, LOW);    // turn the LED off by making the voltage LOW
  delay(1000);                       // wait for a second
}

Remember

To upload this code to your ESP32 board using the Arduino IDE:

1. Make sure you have the ESP32 board installed in the Arduino IDE. You can follow the instructions provided by Espressif or other tutorials online.
2. Connect your ESP32 board to your computer via USB.
3. Select the appropriate board and port from the Arduino IDE’s Tools menu.
4. Click the Upload button to compile and upload the code to your ESP32 board.

Next

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ArduinoCore Interface Basics

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