Smart Water Tank Level & Pump Controller — DIY Kit
Waterproof ultrasonic sensing, dry-run lockout, hysteresis, WhatsApp alerts.
₹2,799MADE TO ORDER
The relay switches a low-voltage control signal only. Connection to a pump starter must be done by a licensed electrician. No mains wiring is supplied.
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12 mo warranty · you assemble · ships in 2 days · home use
Also a working product, not only a student project. This one is built to be installed and left running rather than demonstrated once and shelved — the same hardware either way, with the same warranty and the same documentation pack.
What you can demonstrate
- →Level percentage on the OLED and on a local web page
- →Pump on below 30%, off at 90% — hysteresis prevents relay chatter
- →Sump float switch locks the pump out when the source is dry
- →45-minute maximum runtime with a latched fault
Bill of materials
Every component, by part number. Check our prices against any supplier you like.
| Part | Description | Qty |
|---|---|---|
| ESP32 DevKit V1 | 30-pin, WiFi + Bluetooth | 1 |
| JSN-SR04T | Waterproof ultrasonic, 25–450 cmWaterproof — HC-SR04 fails on tank condensation | 1 |
| SRD-05VDC-SL-C | 5V opto-isolated relay, dry contact outTerminals left unwired for an electrician | 1 |
| Float switch, vertical | Sump level, dry-run lockoutA burnt pump costs ₹8,000 — this is why the homeowner buys it | 1 |
| SSD1306 | 0.96in OLED I2C, addr 0x3C | 1 |
| Buzzer 5V active | Overflow and fault alarm | 1 |
| Tactile switch 6 mm | Mode and manual buttons | 2 |
| ABS enclosure IP54 | 120×80×50 mm | 1 |
| Cable gland + 2-core cable | 3 glands, 5 m sensor run | 1 |
| Adapter 5V 2A | DC adapter with barrel jack | 1 |
| Terminal block, 2-pole | Relay output, shipped unwired | 1 |
Questions
- Why JSN-SR04T instead of the usual HC-SR04?
- A tank headspace is saturated with condensation and an HC-SR04 transducer stops reading within days. The JSN-SR04T probe is sealed. It costs about ₹160 more and removes the entire return category.
- Can I connect my pump directly to the relay?
- No. The relay terminals are brought to a block and left unwired on purpose. They connect to the control coil of a pump starter or contactor, and that connection must be made by a licensed electrician. No mains wiring is supplied with the kit.
- How high should the sensor be mounted?
- At least 30 cm above the maximum water level — the probe has a ~25 cm minimum range and reads garbage below it. Mount it away from the inlet stream too; falling water scatters the echo. Both are on the install sheet.
- Does the report come with it?
- Yes. Every kit ships with the editable report (.docx and .pdf), a 20-slide PPT, circuit and block diagrams, commented source with pinned library versions, 25 viva questions with answers, and a printed wiring sheet in the box.
- Can I change the topic or add a feature?
- Tell us on WhatsApp before you order. Small firmware changes are usually fine; a different sensor means a different kit and a different price.
- Is there cash on delivery?
- No. Prepaid only — UPI, card or netbanking. It keeps the price where it is.
- Will the report match my college format?
- The .docx is unlocked and editable, so you add your college name, roll number and guide. The chapter skeleton follows the standard Anna University / AICTE structure.
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₹2,799