| Component | Connection to Arduino Nano |
|---|---|
| HC-SR04 | |
| Trig | D3 |
| Echo | D4 |
| VCC | 5V |
| GND | GND |
| 433MHz RX Module | |
| Data | D2 |
| VCC | 5V |
| GND | GND |
| Buzzer | |
| Red Wire | D5 |
| Black Wire | GND |
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Alarm system controlled by 433 MHz remote control, based on Arduino Nano and Ultrasonic rangefinder HC-SR04
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