Soluții pentru problemele tale IT
Intr-o solutie anterioara v-am aratat cum ne putem muta pe tab-ul anterior din lista, dar fara a ne lua degetele de pe tastatura, folosind combinatia de taste Ctrl + PgUp. Acum va spun ca avem si o alta combinatie de taste care face exact acelasi lucru.
[mai mult...]Intr-o solutie anterioara v-am aratat cum ne putem muta la urmatorul tab din lista, dar fara a ne lua degetele de pe tastatura, folosind combinatia de taste Ctrl + PgDn. Acum va prezint o alta combinatie de taste care face exact acelasi lucru. Este bine sa avem mai multe optiuni.
[mai mult...]Sa presupunem ca avem un site deschis care are foarte mult text. Vizualizarea acestuia in modul full screen ne ofera mai mult spatiu de lucru. Bineinteles ca putem face si zoom, dar cred ca full screen-ul este mai benefic.
[mai mult...]Sa presupunem ca avem mai multe tab-uri deschise si vrem sa ajungem rapid la ultimul. Pentru aceasta operatiune putem folosi mouse-ul sau un keyboard shortcut.
[mai mult...]The sensor sends out an ultrasonic sound wave from the TRIG pin. When the sound wave hits an object, it reflects back and is detected by the ECHO pin.
The Arduino measures the time it takes for the signal to return and uses that to calculate the distance.
Distance (cm) = (Time in microseconds × 0.034) / 2The speed of sound is 0.034 cm/µs. We divide by 2 because the sound travels to the object and back.
Required Components
| Component | Quantity | Purpose |
|---|---|---|
| Arduino Uno / Nano / Mega | 1 | Main microcontroller |
| HC-SR04 Ultrasonic Sensor | 1 | Measures distance |
| Jumper Wires | 4 | Connections |
| Breadboard (optional) | 1 | Easy wiring |
| USB Cable | 1 | Power & programming |
Pin Connections
Connect the HC-SR04 sensor to the Arduino as shown below:
| HC-SR04 Pin | Arduino Pin |
|---|---|
| VCC | 5V |
| GND | GND |
| TRIG | Digital Pin 9 |
| ECHO | Digital Pin 10 |
Note: The ECHO pin outputs 5V, which is safe for Arduino Uno/Nano/Mega.
Arduino Code
Upload the following code to your Arduino:
#define TRIG_PIN 9
#define ECHO_PIN 10
void setup() {
Serial.begin(9600);
pinMode(TRIG_PIN, OUTPUT);
pinMode(ECHO_PIN, INPUT);
}
void loop() {
long duration;
float distance;
// Clear trigger
digitalWrite(TRIG_PIN, LOW);
delayMicroseconds(2);
// Trigger ultrasonic burst
digitalWrite(TRIG_PIN, HIGH);
delayMicroseconds(10);
digitalWrite(TRIG_PIN, LOW);
// Measure echo time
duration = pulseIn(ECHO_PIN, HIGH);
// Convert time to distance
distance = (duration * 0.034) / 2;
// Output result
Serial.print("Distance: ");
Serial.print(distance);
Serial.println(" cm");
delay(500);
}
Code Explanation
Testing the Sensor
You should see something like:
Distance: 15.4 cmTroubleshooting
| Issue | Cause | Solution |
|---|---|---|
| Always reads 0 cm | Incorrect pin wiring | Check TRIG and ECHO |
| Values jump around | Object surface curved or too small | Use a flat object |
| No Serial output | Wrong baud rate | Set Serial Monitor to 9600 |
| Sensor not working | No power | Ensure 5V and GND connected properly |
[mai mult...]
Daca dorim sa transferam date catre un smartphone sau tableta Apple fara a utiliza iTunes ori a fi limitati la fotografii si inregistrari video, echipa VideoLan au pus la dispozitie aplicatia VLC inclusiv pe Apple AppStore cu functionalitatea de wi-fi sharing inclusa.
[mai mult...]