We designed the Automatic Touchless Arduino Water Dispenser to prevent water wastage.
During pandemics like Covid-19, the frequent need to wash hands leads to significant water wastage, particularly in public places such as hospitals, airports, railway stations, hotels, and restaurants.
Generally, people do not rub their hands with soap for the required 20 seconds before washing them with running water. Or they leave the tap running while rubbing their hands with soap. This proposed system can help solve both these problems.
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| Bill of Material | |
| Components | Quantity |
| Arduino Uno (MOD1) | 1 |
| 12V, 1A adaptor | 1 |
| Ultrasonic sensor HC-SR04 (MOD2) | 1 |
| Transistor BC547 (T1) | 1 |
| 5V relay (R1) | 1 |
| Buzzer (B1) | 1 |
| Cooler water pump | 1 |
| 1k resistor (R1) | 1 |
| LED | 1 |
Working Flow-chart
The flow chart of this low-cost, easy-to-make water dispenser for washing hands is shown in Fig. 1. The components required to make it are mentioned under the Bill of Material table. The circuit diagram for the touchless water dispenser is shown in Fig. 2.
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Thank you for the useful circuit. I have noticed few unique and novel design approaches.
1. There’s no current limiting resistance for the T1(BC547) and directly driven by 5V microcontroller.
2. There’s no current limiting resistance for D1(LED)
3. Reference designator R1 denotes 1kΩ resistor and a Relay(R1).
I have learned a lot from your disruptive design approaches. Thank you for sharing.