Clip-on meter that gives any RO purifier real filter-life tracking
Software: No subscription required
Concept, not for sale yet. Tell us if you want it; that decides what we build.
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How it fits together
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01
The whole PureTrack
A box under the sink counts litres and pump hours on a water purifier, shows service status on LEDs and syncs by Bluetooth or Wi-Fi.
02Brain
ESP32-C3-MINI-1
The brain: it runs the puretrack-fw program
03
Hall flow sensor
Counts litres dispensed on the tap line
ESP32-C3-MINI-1 · GPIO pulse line (3-pin cable) · Flow pulses
04
INA226 pump monitor
Measures pump voltage and current to log run time
ESP32-C3-MINI-1 · I²C (2 wires) · Pump volts and amps
05
TDS probe (optional)
Reads the dissolved solids in the output water
ESP32-C3-MINI-1 · GPIO excitation and ADC · Probe conductance
06
PCF85063A clock
Keeps time when the purifier is switched off
ESP32-C3-MINI-1 · I²C (2 wires) · Time
07
Green, amber, red LEDs
Show service status without a phone
ESP32-C3-MINI-1 · GPIO pins · LED on/off
08
TPS560430 buck
Turns the purifier's 24 V into 3.3 V
ESP32-C3-MINI-1 · Power rail · 3.3 V power
09
All connected
7 key parts, one program, and your phone
What it is
A small clip-on box for an RO purifier's tubing that tracks litres filtered and water TDS.
What it does
Who it's for
Households with RO purifiers and RO service technicians.
The idea
The problem today
RO service dealers change filters and membranes by the calendar, so technicians visit homes that do not need it yet and miss the ones that do. Customers then buy filters from a roadside mechanic, and a $5 TDS pen cannot say how much water has gone through the filters.
With PureTrack
A PureTrack meter fitted beside the purifier counts the litres at the tap, the pump's run time and current, and the water's TDS if the probe is fitted. Its lights show when service is due with no phone, the technician's phone syncs it at each visit, and the dealer gets a weekly list of homes that really need a change.
How the parts connect
Every part, what links it to the brain, and how the data reaches your phone. A solid line is a cable; a dashed line is a radio link.
The program
void app_main(void) {
for (;;) {
litres += flow_pulses_take() / K_PULSES_PER_L; // GPIO interrupt count
amps = ina226_read_current(); // I2C, every 250 ms
pump_on = debounce(amps > 0.150f, 1000);
if (pump_on) pump_seconds += 0.25f;
for (int s = 0; s < n_stages; s++)
stage_update(&stages[s], litres, days_since_reset(s));
leds_show(worst_stage_state()); // green / amber / red
if (hour_elapsed()) flash_ring_append(record_16b());
vTaskDelay(pdMS_TO_TICKS(250));
}
}To your phone
Android phone and web browser
One screen for each job PureTrack does.
Filter dueThe family drinks about 14 litres a day from the RO purifier. The box counts every litre and shows when each filter is really due.
Membrane wearOver the weeks, the membrane slowly lets more dissolved solids through. The optional TDS probe shows the trend before the taste changes.
Pump nonstopThe tank float valve sticks and the purifier pump keeps running with almost no water drawn. The dealer and family get an alert.
App screens with sample data. The interface is in development.
| Litres this hour | 3.4 L | Every hour |
|---|---|---|
| Pump run time | 690 s | Every hour |
| Filter stage use | Sediment 81% | Every hour |
| Output TDS | 41 ppm | Every hour |
| Pump running nonstop | 3 h | When it happens |
Records carry no images. Customer name and address stay in the dealer's own account.
CAD design · Design complete (stages 1–6), not built
| AI processor | ESP32-C3-MINI-1 |
|---|---|
| Sensors | Food-grade Hall-effect flow sensor (YF-S402 class, 1/4 inch) · 2 × analog TDS probes with ADS1115 ADC · 10k NTC thermistor for temperature compensation |
| Connectivity | Wi-Fi · BLE |
| Power | USB-C 5 V or 12 V DC from the purifier, under 1 W (target) |
| Enclosure | Blue-accented white clip-on box with two quick-connect tube fittings, a flow sensor and two TDS probe leads, and a 5-LED filter-life bar on the front, mounted under the sink on the RO line |
| Dimensions | 9 × 5 × 3 cm |
| Weight | ~120 g (est.) |
| Ingress rating | IPX4 splash resistance (target) |
| Flow | Litres counted, 1/4 inch line |
|---|---|
| TDS | Input and output, 0–1,000 ppm (target) |
| Temperature | NTC for TDS compensation |
| Fittings | Two 1/4 inch quick-connect |
| Filter-life bar | 5 LEDs on the front |
|---|---|
| App | Litres, TDS, rejection %, filter due dates |
| Reminders | Push alerts before filters are due |
| Reorder | Link to filters (optional delivery plan planned) |
| Supply | USB-C 5 V or 12 V DC from the purifier |
|---|---|
| Size | 9 × 5 × 3 cm |
| Mounting | Clip-on, under the sink on the RO line |
| Wetted parts | Potable-water-safe materials (certification needed) |
Targets for production units; they may change during development.
Hardware: $29 per purifier
Software: No subscription required
Target pricing. India pricing in rupees to be confirmed. The app is free; an optional filter-delivery plan is planned and will be priced separately.
$29
Filter-life and TDS tracking for one purifier.
$29 + filter plan (priced later)
Adds automatic filter delivery when changes are due.
Custom
For RO service companies and dealers.
Indicative launch pricing in USD, excluding taxes and shipping. Final pricing is confirmed before any balance is charged.
Community
PureTrack is in development. Rate the idea, tell us what to change about the features, specs or price, and we'll build it with your feedback.
How much people want it
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Questions
Tell us what this would save you, or ask anything. We reply within two business days.
A member of the IEMI Labs team will reply within two business days.
From the product lab · ideation phase
Only litres, TDS readings and water temperature from your purifier. Data goes to your app; if you join the filter plan, only filter due dates and delivery details are shared with us. It has no camera or microphone.
No. It is in development and holds no certifications yet. Potable-water material certification for the wetted parts (such as NSF/ANSI 61 or an Indian equivalent) and radio/EMC testing are planned before sale. TDS is not a safety test: PureTrack cannot tell you whether water is safe to drink and does not test for bacteria or harmful chemicals.
The RO line is cut and the two ends pushed into PureTrack's quick-connect fittings, the TDS probes are placed on the input and output side, and the box clips under the sink. It takes about 20 minutes. If you are not comfortable working on the purifier, ask your RO service technician.
The filter-life bar works on its own. BLE connects to your phone nearby, and home Wi-Fi gives reminders anywhere.
No. It is a new concept in development. Specifications are target specifications. It is a concept: we are not taking orders, reservations or deposits, and it has no ship date yet.
We are planning a 2-year limited hardware warranty covering manufacturing defects. Final terms will be published before shipping begins.
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DetailsPureTrack
Concept · target $29