The Corona pandemic is officially over but its ill effects are still being seen, especially in crowded places like popular markets and malls. Besides, one needs to guard against new viruses and mutations of Corona.
The World Health Organization (WHO) recommended keeping a two-meter distance from others and frequently rubbing hands with soap for at least 20 seconds before washing, as a safeguard. The proposed device can help in following the Distance Monitor & Handwashing Timer recommendations of WHO.
The components required to build this gadget are listed in the Bill of Materials Table 1.
| Table 1: Bill of Materials | |
| Components | Quantity |
| Arduino Uno (MOD1) | 1 |
| Ultrasonic sensor HC-SR04 (S1) | 1 |
| HC-05 Bluetooth (MOD2) | 1 |
| Buzzer (B1) | 1 |
| LED1 | 1 |
| Push-to-on switch (SW1) | 1 |
| 5V battery/5V adaptor | 1 |
| Battery holder | 1 |
Circuit Connection
The circuit diagram of the gadget is shown in Fig. 1, while Table 2 shows the connections between the Arduino Uno board and the other devices used for the gadget.
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