Aquarium Auto-Refill Kit with Arduino Uno & Ultrasonic Sensor
Automated Aquarium Water Refill Kit - Arduino Uno + Ultrasonic Distance Sensor
Every part needed, pre-tested for compatibility, with an AI build companion trained on this exact project. Shipped from Bengaluru in 3-5 days.
Keep your aquarium water level steady without daily checks. This kit turns an Arduino Uno and an HC-SR04 ultrasonic sensor into an intelligent refill system that detects when evaporation drops the level, then activates a mini pump to top it up from a reservoir. Perfect for fish keepers, smart-home tinkerers, and young makers learning sensors and automation.
What You'll Build
You will assemble a standalone unit that sits above your aquarium, measures the distance to the water surface with the HC-SR04, and automatically switches on a submersible pump when the level falls below a set threshold. The pump draws water from a separate bottle or container, passing it through a silicone tube until the sensor confirms the level is restored. Everything runs on a 9?V battery, making it safe and portable.
What You'll Learn
- Ultrasonic distance measurement with Arduino and the HC-SR04 sensor
- How to read sensor values and set thresholds in Arduino code
- Controlling a 5?V relay to switch a pump on and off
- Basic circuit building on a breadboard - including protection diodes and pull-down resistors
Kit Contents
| Component | Quantity |
|---|---|
| Arduino Uno R3 | 1 |
| HC-SR04 Ultrasonic Sensor | 1 |
| 5V Relay Module | 1 |
| Mini Submersible Pump | 1 |
| Silicone Tube 30cm | 1 |
| 1N4007 Diode | 3 |
| 10k? Resistors | 5 |
| 400-pt Breadboard | 1 |
| M-M Wires | 20 |
| 9V Battery Snap | 1 |
Why Buy This Kit Instead of Sourcing Parts Separately
| Factor | Sourcing Separately | Compoden Kit |
|---|---|---|
| Compatibility checks | You verify every part | Pre-tested as a system |
| Build support | Forums and scattered tutorials | AI companion trained on this exact project |
| Time to first working build | Days of debugging | Hours, with step-by-step guidance |
| Shipping coordination | Multiple sellers, multiple delays | One shipment from Bengaluru in 3-5 days |
Who This Kit Is For
Young innovators aged 10 and above who want to see an electronic project solve a real household problem. It fits naturally into CBSE Class 6-9 practical assignments, ATL Tinkering Lab sessions, and hobbyist explorations in smart home automation. Parents looking for a meaningful unplugged-yet-coded activity will also find it a rewarding weekend build with their child.
Built and Backed by Compoden
Every Compoden kit ships with an AI build companion trained on this exact project - accessible via a QR code on the box, with WhatsApp and email backup. We've spent 10 years building projects for makers, schools, and institutions across India. If a part fails because of a manufacturing defect, replace it free within 7 days.
What if I get stuck during the build?
Scan the QR code on the box to open your AI build companion. It understands exactly where you are in the project and can provide immediate, step-by-step guidance; you can also message us on WhatsApp for human backup.
Can I use this to monitor and refill a larger tank or pond?
The included mini pump is designed for small aquariums or terrariums. You can easily upgrade the pump and power supply while keeping the same sensor and relay logic-the AI companion will offer tips for scaling up safely.
Do I need any tools that are not in the kit?
No special tools required. You may need a laptop with a USB-A port to load the code onto the Arduino, and a small screwdriver for the relay terminals; both are common household items.
Is this a safe project for a child to do alone?
We recommend adult supervision for the part involving the water pump and electrical connections near water. The circuit itself runs on a 9?V battery and is low voltage, but safe handling of liquids and electronics is essential.
Parking - HC-SR04 monitors aquarium level. Relay pump refills when evaporation lowers level below threshold.
What's in this kit
Other projects you can build
Shipping Information
- Prepaid Orders: ₹75 for orders up to ₹999, FREE shipping above ₹999
- COD Orders: ₹125 shipping + ₹50 COD fee = ₹175 total
- Delivery Timeline: Dispatch in 1-2 days, delivery in 2-7 days depending on location
Returns & Warranty
- 7-Day Return: Manufacturing defects only (approval required)
- Warranty: 7 days from delivery
- Non-Returnable: Batteries, consumables, cut wires, clearance items