MJRoBot (Marcelo Rovai)
Published © LGPL

IOT Made Simple: Playing With the ESP32 on Arduino IDE

We will learn how to program the ESP32 on Arduino IDE, exploring its most common functions and libraries, differences, and new features.

IntermediateFull instructions provided8 hours24,850
IOT Made Simple: Playing With the ESP32 on Arduino IDE

Things used in this project

Hardware components

ESP32S
Espressif ESP32S
×1
RobotGeek 180 Degree Robot Servo
RobotGeek 180 Degree Robot Servo
×1
Adafruit DHT Temperature and Humidity Digital Sensor
×1

Software apps and online services

Arduino IDE
Arduino IDE

Story

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Schematics

electrical diagram

Code

Code snippet #1

Plain text
mkdir -p ~/Documents/Arduino/hardware/espressif && \
cd ~/Documents/Arduino/hardware/espressif && \
git clone https://github.com/espressif/arduino-esp32.git esp32 && \
cd esp32/tools/ && \
python get.py

Code snippet #3

Plain text
/*
  ESP 32 Blink
  Turns on an LED on for one second, then off for one second, repeatedly.
  The ESP32 has an internal blue LED at D2 (GPIO 02)
*/

int LED_BUILTIN = 2;

void setup() 
{
  pinMode(LED_BUILTIN, OUTPUT);
}

void loop() 
{
  digitalWrite(LED_BUILTIN, HIGH);   // turn the LED on (HIGH is the voltage level)
  delay(1000);                       // wait for a second
  digitalWrite(LED_BUILTIN, LOW);    // turn the LED off by making the voltage LOW
  delay(1000);                       // wait for a second
}

Code snippet #5

Plain text
/***************************************************** 
* ESP32 Touch Test and LED Ctrl
* Touch pin ==> Touch0 is T0 which is on GPIO 4 (D4).
* LED pin   ==> D2
* 
* MJRoBot.org 6Sept17
*****************************************************/

#define TOUTCH_PIN T0 // ESP32 Pin D4
#define LED_PIN 2
int touch_value = 100;

void setup()
{
  Serial.begin(115200);
  delay(1000); // give me time to bring up serial monitor
  Serial.println("ESP32 Touch Test");
  pinMode(LED_PIN, OUTPUT);
  digitalWrite (LED_PIN, LOW);
}

void loop()
{
  touch_value = touchRead(TOUTCH_PIN);
  Serial.println(touch_value);  // get value using T0 
  if (touch_value < 50)
  {
    digitalWrite (LED_PIN, HIGH);
  }
  else
  {
    digitalWrite (LED_PIN, LOW);
  }
  delay(1000);
}

Code snippet #7

Plain text
<p>/***************************************************** <br>* ESP32 Analog Input Test 
* Analog Input: ADC_1_0 pin ==> GPIO36 (VP).
* 
* MJRoBot.org 6Sept17
*****************************************************/
//Analog Input
#define ANALOG_PIN_0 36
int analog_value = 0;</p><p>void setup()
{
  Serial.begin(115200);
  delay(1000); // give me time to bring up serial monitor
  Serial.println("ESP32 Analog IN Test");
}</p><p>void loop()
{
  analog_value = analogRead(ANALOG_PIN_0);
  Serial.println(analog_value);
  delay(500);
}</p>

Code snippet #10

Plain text
void setup()
{
  ledcSetup(ledChannel, freq, resolution);
  ledcAttachPin(LED_PIN, ledChannel);
}

Code snippet #13

Plain text
***************************************************** 
* ESP32 Analog Input/Output Test 
* Analog Input: ADC_1_0 pin ==> GPIO36 (VP).
* PWM LED pin   ==> GPIO 02
* 
* MJRoBot.org 6Sept17
*****************************************************/
//Analog Input
#define ANALOG_PIN_0 36
int analog_value = 0;

// PMW LED
#define LED_PIN 2
int freq = 5000;
int ledChannel = 0;
int resolution = 8;
int dutyCycle = 0;

void setup()
{
  Serial.begin(115200);
  delay(1000); // give me time to bring up serial monitor
  Serial.println("ESP32 Analog IN/OUT Test");

  ledcSetup(ledChannel, freq, resolution);
  ledcAttachPin(LED_PIN, ledChannel);
  ledcWrite(ledChannel, dutyCycle);
}

void loop()
{
  analog_value = analogRead(ANALOG_PIN_0);
  Serial.println(analog_value);
  dutyCycle = map(analog_value, 0, 4095, 0, 255);
  ledcWrite(ledChannel, dutyCycle);
  delay(500);
}

Code snippet #16

Plain text
void setup()
{
  ledcSetup(channel, freq, resolution);
  ledcAttachPin(SERVO_PIN, channel);
}

Code snippet #19

Plain text
/***************************************************** 
* ESP32 Servo Control 
* Analog Input: ADC_1_0 pin ==> GPIO36 (VP).
* PWM SERVO pin   ==> GPIO 05
* 
* MJRoBot.org 6Sept17
*****************************************************/
//Analog Input
#define ANALOG_PIN_0 36
int analog_value = 0;

// PMW SERVO
#define SERVO_PIN 5
int freq = 50;
int channel = 0;
int resolution = 8;
int dutyCycle = 21;

void setup()
{
  Serial.begin(115200);
  delay(1000); // give me time to bring up serial monitor
  Serial.println("ESP32 Servo Control");

  ledcSetup(channel, freq, resolution);
  ledcAttachPin(SERVO_PIN, channel);
  ledcWrite(channel, dutyCycle);
}

void loop()
{
  analog_value = analogRead(ANALOG_PIN_0);
  Serial.print(analog_value);
  Serial.print(" Duty Cycle ==> ");
  Serial.println(dutyCycle);
  dutyCycle = map(analog_value, 0, 4095, 10, 33);
  ledcWrite(channel, dutyCycle);
  delay(50);
}

Code snippet #21

Plain text
/**************************************************************
 * Local Time Stamp with ESP32
 * Developed by Marcelo Rovai - 8 September 2017
 **************************************************************/
#include <NTPClient.h>
#include <WiFi.h>
#include <WiFiUdp.h>

#define NTP_OFFSET  -3  * 60 * 60 // In seconds
#define NTP_INTERVAL 60 * 1000    // In miliseconds
#define NTP_ADDRESS  "europe.pool.ntp.org"

WiFiUDP ntpUDP;
NTPClient timeClient(ntpUDP, NTP_ADDRESS, NTP_OFFSET, NTP_INTERVAL);

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

Github

https://github.com/espressif/arduino-esp32

ESP32 Playing with ...

Credits

MJRoBot (Marcelo Rovai)

MJRoBot (Marcelo Rovai)

60 projects • 913 followers
Professor, Engineer, MBA, Master in Data Science. Writes about Electronics with a focus on Physical Computing, IoT, ML, TinyML and Robotics.

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