Microcontroller 101

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09-04-24 e͎l͎e͎c͎t͎r͎i͎c͎ t͎r͎i͎c͎k͎s͎

LOLIN 32 Installation party :~)

Wemos LOLIN32 - ESP32

Pinout LOLIN D32 PRO

more info about the lolin32 is here: https://www.wemos.cc/en/latest/d32/d32_pro.html

step 1: download Arduino software

step 2: download driver for microcontroller

step 3: install driver

_windows: open Device Manager >> find UART device >> right click and update driver >> select driver

step 4: install esp32 library in the board manager

Arduino code

Hello World!

in the Arduino program, select the correct board (WEMOS LOLIN32) and select the USB port you are using (if you are unsure, check the listed ports, unplug and see what changed)

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

void loop() {
  Serial.println("Hello World!");   //sends a message to the computer
}

Simple Led blink example

Simple Led Blink Example

Simple Led Blink Example Schematics

// always use a "preresistor" with the LED, because the 5v coming from the microcontroller is too much
// a LED only consumes ~2.5 volt, the resistor the other volt
// 
 
int ledPin = 23;               //the int ledPin is 13

void setup() {
  pinMode(ledPin,OUTPUT);      //ledPin is a OUTPUT
}

void loop() {
  digitalWrite(ledPin,HIGH);   //turns pin 13 on
  delay(500);                  //stops the loop for 500 milliseconds
  digitalWrite(ledPin,LOW);    //turns pin 13 off
  delay(500);                  //stops the loop for 500 milliseconds
}

Traffic light example

int RedLedPin = 23;                 //the int RedLedPin is 13
int GreenLedPin = 22;               //the int GreenLedPin is 12

void setup() {
  pinMode(RedLedPin,OUTPUT);        //ledPin is a OUTPUT
  pinMode(GreenLedPin,OUTPUT);      //ledPin is a OUTPUT

}

void loop() {
  digitalWrite(GreenLedPin,HIGH);   //turns green led  on
  delay(5000);                      //stops the loop for 5000 milliseconds
  for(int i = 0; i < 5; i++){       //this for loop gets 5 times repeated
    digitalWrite(GreenLedPin,LOW);  //turns green led off
    delay(500);                     //stops the loop for 500 milliseconds
    digitalWrite(GreenLedPin,HIGH); //turns green led off
    delay(500);                     //stops the loop for 500 milliseconds
  }
  digitalWrite(GreenLedPin,LOW);    //turns green led off
  digitalWrite(RedLedPin,HIGH);     //turns red led on
  delay(5000);                      //stops the loop for 5000 milliseconds
  digitalWrite(RedLedPin,LOW);      //turns red led on
}

LDR example

example with a light resistor. keep in mind the LDR pin needs to be a pin with a ADC(analog to digital converter), because you check the analog voltage. on the arduino these are the ANALOG IN pins. on the ESP32 the pins with the ADC(check the pinout graphic)

int LDR = 34;                 //the LDR pin

void setup() {
  Serial.begin(115200);
  pinMode(LDR,INPUT);        //LDR is an INPUT
}

void loop() {
  int value = analogRead(LDR); // read the analog value of the LDR
  Serial.println(value);       // print the value of the LDR, open serial monitor
  delay(10);
}

LDR & speaker example

int LDR = 34;                 //the LDR pin
int speaker = 23;

void setup() {
  Serial.begin(115200);
  pinMode(LDR,INPUT);        //LDR is an INPUT
  pinMode(speaker,OUTPUT);        //speaker is a OUTPUT
}

void loop() {
  int value = analogRead(LDR); // read the analog value of the LDR
  Serial.println(value);       // print the value of the LDR, open serial monitor
  tone(speaker,value);         //create a frequency on the speaker pin; the frequency hertz is the value
  delay(10);
}

Poti example

int poti = 34;                 //the poti pin

void setup() {
  Serial.begin(115200);
  pinMode(poti,INPUT);        //poti is an INPUT
}

void loop() {
  int value = analogRead(poti); // read the analog value of the poti
  Serial.println(value);       // print the value of the poti, open serial monitor
  delay(10);
}

Poti & speaker example

//keep in mind you can only use a mini speaker. for bigger speakers you need an amplifier. 
int poti = 34;                 //the pto pin
int speaker = 23;

void setup() {
  Serial.begin(115200);
  pinMode(poti,INPUT);        //poti is an INPUT
  pinMode(speaker,OUTPUT);        //speaker is a OUTPUT
}

void loop() {
  int value = analogRead(poti); // read the analog value of the poti
  Serial.println(value);       // print the value of the poti, open serial monitor
  tone(speaker,value);         //create a frequency on the speaker pin; the frequency hertz is the value
  delay(10);
}

Button & alarm example

int button = 34;
int speaker = 23;

void setup() {
  Serial.begin(115200);   //make usb connection
  pinMode(button, INPUT);    //button is an INPUT
  pinMode(speaker, OUTPUT);    //speaker is an OUTPUT

}

void loop() {
  bool value = digitalRead(button);    //read the digital value of button
  if(button){
    Serial.println("start alarm");
    for(int repeter = 0; repeter<5; repeter++){   //repeat 5 times
      for(int frequency = 500; frequency<1200; frequency++){    //count from 500 to 1200
        tone(speaker, fequency);    //generate the frequency on the speaker pin
        delay(5);
      }
      notone(speaker);    //turn off the speaker pin
      delay(500);         //
    }
  }else{
    Serial.println("button not pressed");
  }
}

16-04-24 ๓໐t໐rŞ + ŞēຖŞ໐rŞ = r໐๖໐t

sensors

humidity

the DHT22 humidity sensor :)

#include <DHT.h>;

//Constants
#define DHTPIN 21     // what pin we're connected to
#define DHTTYPE DHT22   // DHT 22  (AM2302)
DHT dht(DHTPIN, DHTTYPE); //// Initialize DHT sensor for normal 16mhz Arduino


//Variables
int chk;
float hum;  //Stores humidity value
float temp; //Stores temperature value

void setup()
{
    Serial.begin(9600);
	dht.begin();

}

void loop()
{
    //Read data and store it to variables hum and temp
    hum = dht.readHumidity();
    temp= dht.readTemperature();
    //Print temp and humidity values to serial monitor
    Serial.print("Humidity: ");
    Serial.print(hum);
    Serial.print(" %, Temp: ");
    Serial.print(temp);
    Serial.println(" Celsius");
    delay(2000); //Delay 2 sec.
}

sound

KY-037 Sound Detection Sensor Module :::;;-))

int sensorPin = 21;    // select the input pin for the potentiometer a0 on board, D1 pinout not connected
int sensorValue = 0;  // variable to store the value coming from the sensor




void setup() {
  // declare the ledPin as an OUTPUT:
  Serial.begin(9600);
  pinMode(22, OUTPUT); // 
}


void loop() {
  // read the value from the sensor:
  sensorValue = analogRead(sensorPin);    
  // turn the ledPin on
  Serial.println(sensorValue);




  if (sensorValue>448) {
    Serial.println("high detected");
    digitalWrite(22, HIGH);
    Serial.println("Blink On");
    delay(2000);
    digitalWrite(22, LOW);
   
  }
  else {
    digitalWrite(22, LOW);
  }
}

soil moisture

Capacitive Soil Moisture Sensor Module :~)

const int dry = 595; // Value for dry sensor
const int wet = 239; // Value for wet sensor

void setup() {
  Serial.begin(9600); // Initialize serial communication
}

void loop() {
  int sensorVal = analogRead(26); // Read moisture sensor value from pin A0

  int percentageHumidity = map(sensorVal, wet, dry, 0, 100); // Convert sensor value to percentage

  Serial.print(percentageHumidity); // Print percentage humidity value
  Serial.println("%"); // Print % symbol
  delay(100); // Delay for stability
}

sonar distance

*/
// defines pins numbers
const int trigPin = 21;
const int echoPin = 14;
// defines variables
long duration;
int distance;
void setup() {
  pinMode(trigPin, OUTPUT); // Sets the trigPin as an Output
  pinMode(echoPin, INPUT); // Sets the echoPin as an Input
  Serial.begin(9600); // Starts the serial communication
}
void loop() {
  // Clears the trigPin
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  // Sets the trigPin on HIGH state for 10 micro seconds
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  // Reads the echoPin, returns the sound wave travel time in microseconds
  duration = pulseIn(echoPin, HIGH);
  // Calculating the distance
  distance = duration * 0.034 / 2;
  // Prints the distance on the Serial Monitor
  Serial.print("Distance: ");
  Serial.println(distance);
}

water sensor

https://lastminuteengineers.com/water-level-sensor-arduino-tutorial/

// Sensor pins
#define sensorPower 7
#define sensorPin A0

// Value for storing water level
int val = 0;

void setup() {
	// Set D7 as an OUTPUT
	pinMode(sensorPower, OUTPUT);
	
	// Set to LOW so no power flows through the sensor
	digitalWrite(sensorPower, LOW);
	
	Serial.begin(9600);
}

void loop() {
	//get the reading from the function below and print it
	int level = readSensor();
	
	Serial.print("Water level: ");
	Serial.println(level);
	
	delay(1000);
}

//This is a function used to get the reading
int readSensor() {
	digitalWrite(sensorPower, HIGH);	// Turn the sensor ON
	delay(10);							// wait 10 milliseconds
	val = analogRead(sensorPin);		// Read the analog value form sensor
	digitalWrite(sensorPower, LOW);		// Turn the sensor OFF
	return val;							// send current reading
}

sensor readings as motor control

try to merge using this logic:

#include <Servo.h>

Servo servoMotor;

const int sensorPin = 33;   // Analog pin connected to the sensor
const int servoPin = 21;     // whatever pin you have the servo connected to

void setup() {
  Serial.begin(9600);
  servoMotor.attach(servoPin);
}

void loop() {
  int sensorValue = analogRead(sensorPin);   // Read sensor value
  int servoPosition = map(sensorValue, 0, 1023, 0, 4095); // Map sensor value to servo range

  servoMotor.writeMicroseconds(servoPosition); // Set servo position
  delay(15);  // Add a small delay for stability
}