Aplicații

E-mail 1002 Solutii

This app brings macOS Tahoe’s best feature to Windows 11

Data 10/11/2025
Autor scorus adrian
4
24

[mai mult...]

There’s a hidden app store built into the Windows Terminal

Data 10/11/2025
Autor scorus adrian
2
31

[mai mult...]

How to disable Now Playing on a Google Pixel phone

Data 10/11/2025
Autor scorus adrian
0
34

[mai mult...]

Arduino Weather Station guide

Data 09/11/2025
Autor Daniel Ionica
10
216

The DHT11 and DHT22 measure temperature and humidity. DHT22 offers higher accuracy and a wider range.

Pin	Description
VCC	+5V
DATA	Data output (connect to D2)
NC	Not connected
GND	Ground

BMP180 / BME280

Measures pressure and temperature using the I2C interface.

Pin	Description
VIN	+3.3V or +5V
GND	Ground
SCL	I2C Clock (A5)
SDA	I2C Data (A4)

LCD (16×2 I2C)

Displays data using the I2C interface — only two wires are required (SDA, SCL).
The most common I2C addresses are 0x27 or 0x3F.

Wiring Diagram

Component	Arduino Pin	Notes
DHT11 Data	D2	Use 10kΩ pull-up resistor (optional)
BMP180 SDA	A4	I2C Data
BMP180 SCL	A5	I2C Clock
LCD SDA	A4	Shared with BMP180
LCD SCL	A5	Shared with BMP180
Power (+)	5V	Common power line
Ground (–)	GND	Common ground

On Arduino Mega, use SDA = 20 and SCL = 21 instead.

Arduino Code Example


#include <Wire.h>
#include <Adafruit_Sensor.h>
#include <Adafruit_BMP085.h>
#include <DHT.h>
#include <LiquidCrystal_I2C.h>

// Define sensors
#define DHTPIN 2
#define DHTTYPE DHT11   // or DHT22

DHT dht(DHTPIN, DHTTYPE);
Adafruit_BMP085 bmp;
LiquidCrystal_I2C lcd(0x27, 16, 2); // Change address if needed (0x3F or 0x27)

void setup() {
  Serial.begin(9600);
  lcd.begin(16, 2);
  lcd.backlight();
  dht.begin();

  if (!bmp.begin()) {
    Serial.println("BMP180 not found!");
    lcd.print("BMP Error!");
    while (1);
  }

  lcd.clear();
  lcd.print("Weather Station");
  delay(2000);
}

void loop() {
  float h = dht.readHumidity();
  float t = dht.readTemperature();
  float p = bmp.readPressure() / 100.0; // hPa

  if (isnan(h) || isnan(t)) {
    Serial.println("DHT read error!");
    return;
  }

  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("T:");
  lcd.print(t);
  lcd.print((char)223);
  lcd.print("C H:");
  lcd.print(h);
  lcd.print("%");

  lcd.setCursor(0, 1);
  lcd.print("P:");
  lcd.print(p);
  lcd.print(" hPa");

  Serial.print("Temp: "); Serial.print(t);
  Serial.print(" °C  Hum: "); Serial.print(h);
  Serial.print("%  Pressure: "); Serial.print(p);
  Serial.println(" hPa");

  delay(2000);
}

Explanation: This program reads data from the DHT and BMP sensors, then prints it to both the Serial Monitor and the LCD screen.

How It Works

The sensors measure temperature, humidity, and pressure.
Arduino reads and formats this data.
The LCD displays readings in real time.
Every few seconds, the data updates automatically.

Troubleshooting

Problem	Possible Cause	Solution
LCD shows random text	Wrong I2C address	Try 0x3F instead of 0x27
“BMP180 not found!”	Wiring issue	Check SDA/SCL and power
DHT readings show NaN	Missing library or bad sensor	Install DHT library, recheck wiring
LCD blank	Contrast too low or backlight off	Adjust contrast screw or enable backlight

Install these from Arduino IDE → Sketch → Include Library → Manage Libraries:

DHT sensor library by Adafruit
Adafruit Unified Sensor
Adafruit BMP085 Library or Adafruit BME280
LiquidCrystal_I2C

Optional: IoT Integration

Add an ESP8266 or ESP32 to send data to cloud platforms such as:

ThingSpeak
Blynk
Adafruit IO

Use libraries like ESP8266WiFi.h and HTTPClient.h to upload readings as HTTP requests.

Expansion Ideas

Add a rain sensor or anemometer (wind speed)
Store data on an SD card
Add a real-time clock (RTC) for timestamped data
Display graphs on a web dashboard.

[mai mult...]

Arduino Distance Sensor with OLED Display

Data 09/11/2025
Autor Daniel Ionica
-1
181

This project uses an HC-SR04 Ultrasonic Distance Sensor and a 0.96” I2C OLED display to measure and display the distance to an object in real-time.
It’s an excellent beginner-to-intermediate Arduino project that teaches sensor interfacing, I2C communication, and real-time data display.

In this guide, you’ll learn how to:

Connect and use the HC-SR04 Ultrasonic Sensor
Display the measured distance on an OLED screen
Format readings for easy readability

Components Required

Component	Quantity	Description
Arduino Uno / Nano / Mega	1	Main controller
HC-SR04 Ultrasonic Sensor	1	Measures distance via sound waves
0.96” OLED Display (SSD1306)	1	I2C display for output
Breadboard	1	For wiring
Jumper wires	6–8	Male-to-male connections
USB cable	1	For programming and power

The HC-SR04 measures distance by sending out an ultrasonic pulse and timing how long it takes to bounce back.
The Arduino calculates the distance based on the time delay and the known speed of sound.

Distance Formula:

Distance (cm) = (Time in microseconds × 0.034) / 2

The division by 2 accounts for the round trip of the sound wave (out and back).

Pin Connections

Component	Arduino Pin	Notes
HC-SR04 VCC	5V	Power supply
HC-SR04 GND	GND	Common ground
HC-SR04 TRIG	D9	Trigger pin
HC-SR04 ECHO	D10	Echo pin
OLED VCC	5V	Power
OLED GND	GND	Ground
OLED SDA	A4	I2C Data
OLED SCL	A5	I2C Clock

Note: On Arduino Mega, use SDA = 20 and SCL = 21 instead.

Arduino Code Example

#include <Wire.h> #include <Adafruit_GFX.h> #include <Adafruit_SSD1306.h>


#define TRIG_PIN 9

#define ECHO_PIN 10

#define SCREEN_WIDTH 128

#define SCREEN_HEIGHT 64
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);
void setup() {

  Serial.begin(9600);

  pinMode(TRIG_PIN, OUTPUT);

  pinMode(ECHO_PIN, INPUT);
  // Initialize OLED

  if (!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {

    Serial.println("OLED not found!");

    while (true);

  }
  display.clearDisplay();

  display.setTextSize(1);

  display.setTextColor(SSD1306_WHITE);

  display.setCursor(0, 0);

  display.println("Distance Sensor");

  display.display();

  delay(1500);

}
void loop() {

  long duration;

  float distance;
  // Send trigger pulse

  digitalWrite(TRIG_PIN, LOW);

  delayMicroseconds(2);

  digitalWrite(TRIG_PIN, HIGH);

  delayMicroseconds(10);

  digitalWrite(TRIG_PIN, LOW);
  // Measure echo time

  duration = pulseIn(ECHO_PIN, HIGH);

  distance = (duration * 0.034) / 2;
  // Print to Serial Monitor

  Serial.print("Distance: ");

  Serial.print(distance);

  Serial.println(" cm");
  // Display on OLED

  display.clearDisplay();

  display.setTextSize(1);

  display.setCursor(0, 0);

  display.println("Distance Sensor");
  display.setTextSize(2);

  display.setCursor(0, 30);

  display.print(distance, 1);

  display.println(" cm");

  display.display();

delay(500); }

Explanation: The Arduino sends a pulse from the HC-SR04 and measures the time it takes to return.
It then converts this time into distance and displays it on the OLED screen.

Code Breakdown

pulseIn() measures the length of time the echo pin is HIGH.
Distance is calculated using the speed of sound (0.034 cm/μs).
Adafruit_SSD1306 and Adafruit_GFX libraries drive the OLED.
Display refreshes every 0.5 seconds for updated readings.

Install these via Arduino IDE → Sketch → Include Library → Manage Libraries:

Adafruit SSD1306
Adafruit GFX

Search for “Adafruit SSD1306” and “Adafruit GFX” and click Install.

Troubleshooting

Issue	Cause	Solution
OLED blank	Wrong I2C address	Try changing `0x3C` to `0x3D`
Distance always 0	Echo pin not connected	Check TRIG and ECHO wiring
Unstable readings	Object too close or far	HC-SR04 range: 2–400 cm
Serial Monitor empty	Wrong baud rate	Ensure 9600 baud in Serial Monitor

Optional Upgrades

Add a buzzer that activates when an object is too close.
Display a bar graph or animation on the OLED.
Send readings to the cloud using ESP8266 / ESP32.
Log readings to an SD card.

Applications

Parking assist system
Object detection robot
Smart trash bin (auto open lid)
Liquid level detector.

[mai mult...]

Cum se instalează PHP 5.6 și 7.0 – 8.4 cu PHP-FPM și modul FastCGI pentru ISPConfig 3.2 cu apt pe Debian 11 până la 12

Data 06/11/2025
Autor Adrian Imbrea
4
80

1 Notă preliminară

În acest ghid, veți adăuga depozitul suplimentar SURY pentru a instala pachetele PHP cu apt. Deoarece și alte pachete, precum OpenSSL, sunt actualizate, pachetele instalate de pe sury.org nu pot fi pur și simplu eliminate după instalare. Așadar, nu eliminați SURY ca sursă de depozit ulterior.

Vă rugăm să rețineți că PHP-FPM poate fi utilizat pe serverele Apache și Nginx, în timp ce FastCGI este disponibil numai pentru serverele Apache.

2 Add SURY repository

Mai întâi instalați aceste pachete necesare:

apt-get install -y apt-transport-https lsb-release ca-certificates

Acum adăugați cheia depozitului rulând această comandă:

wget -O /etc/apt/trusted.gpg.d/php.gpg https://packages.sury.org/php/apt.gpg >/dev/null 2>&1

și depozitul în sine:

echo "deb https://packages.sury.org/php/ $(lsb_release -c -s) main" > /etc/apt/sources.list.d/php.list

Acum actualizați lista de pachete:

apt-get update

Pentru a actualiza pachetele deja instalate din noul depozit, utilizați această comandă:

apt-get upgrade

3 Install additional PHP versions

Nu trebuie să instalați toate versiunile listate aici, instalați-le pe cele de care aveți nevoie..

3.1 Install PHP 5.6