Stații de lucru

OS - Windows 8797 Solutii

Reguli si plangeri 9 Solutii

OS - OS X 409 Solutii

Reguli de configurare 11 Solutii

Licentiere 18 Solutii

Securitate 179 Solutii

Copie de rezerva (Backup) 68 Solutii

Antivirus 71 Solutii

Aplicatii specifice 4997 Solutii

Hardware 290 Solutii

Review Attack Shark X3Pro mouse

The Attack Shark X3 Pro wireless gaming mouse is an excellent budget option that delivers performance and features normally found in more expensive models. It is designed for competitive gaming while remaining comfortable and reliable for everyday use, making it a strong quality-to-price choice.

Why it’s worth buying (value for money):

  1. High-performance sensor:
    The X3 Pro is equipped with a PixArt PAW3395 optical sensor, which is widely recognized for its accuracy, low latency, and reliability. This ensures precise tracking for FPS, MOBA, and fast-paced competitive games, even at high DPI settings.
  2. Lightweight design:
    With a weight of approximately 55–60 grams, the mouse is very light, allowing for quick movements and reduced hand fatigue during long gaming sessions. This lightweight construction is a major advantage at this price point.
  3. Wireless performance:
    The mouse supports 2.4 GHz wireless connectivity, delivering a stable, low-latency connection comparable to wired mice. This makes it suitable for competitive gaming without cable drag.
  4. Long battery life:
    Thanks to efficient power management, the X3 Pro offers excellent battery life, allowing extended use without frequent charging, which is ideal for both gaming and productivity.
  5. Good build quality:
    Despite its affordable price, the mouse feels solid and well-assembled. The buttons provide crisp clicks, and the scroll wheel is precise, contributing to a premium feel relative to its cost.
  6. Customizable software:
    The companion software allows you to adjust DPI levels, polling rate, button assignments, and macros, giving users control over performance tuning and personalization.
[mai mult...]

Review Attack Shark x85 keyboard

The Attack Shark X85 wireless mechanical keyboard delivers excellent performance and features for its price class. It is a 75% layout mechanical keyboard with a compact design that retains essential keys while saving desk space, making it ideal for both gaming and daily productivity.

Why it’s worth buying (value for money):

  1. Versatile connectivity: You can use it in wired (USB-C), 2.4 GHz wireless, or Bluetooth mode, allowing seamless switching between multiple devices (PC, laptop, tablet).
  2. Premium typing feel: The keyboard uses a gasket mount structure with five layers of sound-absorbing material, which results in a smoother, quieter typing experience that punches above its price point.
  3. Hot-swappable switches: You can easily replace or customize the mechanical switches without soldering. This is rare at this price level and adds long-term value.
  4. Durable keycaps: Cherry-profile PBT keycaps are more wear-resistant than typical ABS caps, maintaining a clean look after extended use.
  5. Long battery life: A 5000 mAh battery supports extended wireless sessions.
  6. RGB lighting & control knob: Customizable RGB backlighting and an aluminum CNC volume/lighting control knob add usability and aesthetics without a high cost.

Overall, for gamers, programmers, or general users on a budget, the Attack Shark X85 offers very strong performance and features relative to its price, making it a compelling budget mechanical keyboard option.

[mai mult...]

Artefacte grafice (ale texturilor) in aplicatii 2D sau 3D pe terminale iOS/Android (ARM)

Daca se respecta anumite “conditii”, desi dispozitivul este sau a fost perfect functional fara a avea disfunctionalitati de natura hardware, putem observa ca in anumite aplicatii si/sau motoare grafice texturile/imaginile/loading bars fie sunt albe sau incarca lent, fie prezinta tipare de culori la intamplare.

Desigur, sunt posibile si alte simptome dar cele de mai sus au fost observate si remediate cu metoda prezentata in continuare.

[mai mult...]

Arduino Fingerprint Sensor

Required Components

Component Quantity Description
Arduino Uno / Nano / Mega 1 Main controller
Fingerprint Sensor (R307 / ZFM-20 / Adafruit) 1 Biometric identification
16×2 LCD with I2C Module 1 Display user messages
12V Solenoid Lock 1 Door/box locking mechanism
5V Relay Module 1 Controls solenoid lock
12V Power Supply 1 Powers solenoid
Jumper Wires – Connections

The fingerprint sensor scans the user’s finger. Arduino checks if the fingerprint matches a stored ID. If it matches, the relay is activated and unlocks the solenoid lock. The LCD shows:

  • Scanning
  • Access Granted
  • Access Denied

Fingerprint Sensor → Arduino

VCC → 5V
GND → GND
TX  → D2
RX  → D3

I2C LCD → Arduino

VCC → 5V
GND → GND
SDA → A4
SCL → A5

Relay Module → Arduino

IN  → D8
VCC → 5V
GND → GND

Solenoid Lock Power Wiring

12V+ → COM on Relay
NO   → Solenoid +
Solenoid - → 12V -

IMPORTANT: Use a diode (1N4007) across solenoid terminals to prevent voltage spikes.

Arduino Code (Copy & Paste)

This code controls the fingerprint module, LCD display, and solenoid lock.


#include <Adafruit_Fingerprint.h>
#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <SoftwareSerial.h>

SoftwareSerial fingerSerial(2, 3); // RX, TX
Adafruit_Fingerprint finger = Adafruit_Fingerprint(&fingerSerial);
LiquidCrystal_I2C lcd(0x27, 16, 2);

int relayPin = 8;

void setup() {
lcd.init();
lcd.backlight();

pinMode(relayPin, OUTPUT);
digitalWrite(relayPin, LOW); // lock OFF at start

lcd.setCursor(0, 0);
lcd.print("Fingerprint");
lcd.setCursor(0, 1);
lcd.print("Access System");

delay(2000);
lcd.clear();

finger.begin(57600);
if (finger.verifyPassword()) {
lcd.print("Sensor Ready");
} else {
lcd.print("Sensor Error");
while (1);
}
delay(2000);
lcd.clear();
}

void loop() {
lcd.setCursor(0, 0);
lcd.print("Place Finger...");
lcd.setCursor(0, 1);
lcd.print(" ");

int result = getFingerprintID();

if (result >= 0) {
lcd.clear();
lcd.print("Access Granted");
unlockDoor();
} else if (result == -1) {
lcd.clear();
lcd.print("Access Denied");
delay(1500);
}

lcd.clear();
}

int getFingerprintID() {
finger.getImage();
if (finger.image2Tz() != FINGERPRINT_OK) return -1;
if (finger.fingerSearch() != FINGERPRINT_OK) return -1;

return finger.fingerID; // valid ID returned
}

void unlockDoor() {
digitalWrite(relayPin, HIGH); // open lock
delay(3000); // unlock duration
digitalWrite(relayPin, LOW); // lock again
}

You must add fingerprints before using the system.

  1. In Arduino IDE, go to File → Examples → Adafruit Fingerprint Sensor Library → Enroll
  2. Upload the sketch
  3. Open Serial Monitor
  4. Type the fingerprint ID number (1–127)
  5. Place finger twice when instructed

Fingerprint is now stored.

LCD Display Messages

Event Message
Startup Fingerprint Access System
Ready Sensor Ready
Waiting Place Finger…
Match Access Granted
No Match Access Denied

Troubleshooting

  • Fingerprint not detected: TX/RX wiring reversed
  • LCD not showing text: Wrong I2C address (try 0x3F)
  • Solenoid not activating: Check relay NO/COM wiring
  • Machine resets: Solenoid drawing current — use separate 12V supply.
[mai mult...]

Arduino Air Quality Monitoring System

Build your own Arduino-based Air Quality Monitor using sensors like the MQ-135, MQ-7, and DHT11/DHT22. This guide explains how the sensors work, how to wire them, and includes a fully commented Arduino code example.

Components Needed

Component Qty Description
Arduino Uno / Nano / Mega 1 Main microcontroller
MQ-135 Gas Sensor 1 Detects VOCs, NH₃, CO₂, smoke, pollution
DHT11 or DHT22 1 Temperature & Humidity
MQ-7 (optional) 1 Carbon Monoxide sensor
0.96″ OLED (optional) 1 Displays readings
Breadboard & Jumper Wires – Wiring
USB Cable 1 Power + programming

How the Sensors Work

MQ-135 (Air Quality Sensor)

Detects harmful gases such as CO₂, NH₃, NOx, benzene, and VOCs. The analog output value increases when the air becomes more polluted. Requires a short preheat time for accuracy.

MQ-7 (Carbon Monoxide)

Detects CO gas. Optional component for advanced monitoring.

DHT11 / DHT22

Reads temperature and humidity. These values help interpret gas sensor readings more accurately.

MQ-135 Wiring

MQ135 → Arduino
VCC   → 5V
GND   → GND
A0    → A0

DHT11 / DHT22

DHT Sensor → Arduino
VCC        → 5V
GND        → GND
DATA       → D2

OLED (I2C)

OLED → Arduino
VCC  → 5V
GND  → GND
SDA  → A4
SCL  → A5

Arduino Code (Copy & Paste)


#include <DHT.h>

#define DHTPIN 2
#define DHTTYPE DHT22 // change to DHT11 if needed
DHT dht(DHTPIN, DHTTYPE);

int mq135Pin = A0;

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

void loop() {

// --- Read MQ135 Sensor ---
int mqValue = analogRead(mq135Pin);
float airQuality = map(mqValue, 0, 1023, 0, 500);
// 0 = clean air, 500 = very polluted

// --- Read Temperature & Humidity ---
float humidity = dht.readHumidity();
float temperature = dht.readTemperature();

// --- Output Data ---
Serial.println("----------- AIR QUALITY MONITOR -----------");
Serial.print("MQ135 Raw Value: ");
Serial.println(mqValue);

Serial.print("Air Quality Index (approx): ");
Serial.print(airQuality);
Serial.println(" / 500");

Serial.print("Temperature: ");
Serial.print(temperature);
Serial.println(" *C");

Serial.print("Humidity: ");
Serial.print(humidity);
Serial.println(" %");

Serial.println("-------------------------------------------\\n");

delay(1000);
}

Understanding the Readings

MQ135 Reading Air Quality Description
0–80 Excellent Very clean air
80–150 Good Normal indoor air
150–250 Moderate Needs ventilation
250–350 Poor Polluted environment
350–500+ Hazardous High VOCs or smoke detected

Troubleshooting

  • Sensor always reads high: MQ-135 needs 1–5 minutes warm-up time.
  • No DHT readings: Check DATA pin and DHT type in code.
  • Unstable values: Add a 100nF decoupling capacitor to MQ sensor.
  • OLED not showing: Wrong I2C address — run an I2C scanner.
[mai mult...]