Apps that read your scales, sensors and trackers directly

Who this is for

Consider a cold-storage unit near Theni that rents chamber space to grape and vegetable traders from the Cumbum valley. Each chamber must hold a set temperature and humidity day and night. Today a staff member reads the panel display every few hours and writes it in a register; if a compressor trips at two in the morning, nobody knows until the next round, by which time a trader's stock may be damaged. At intake, crates are weighed on a platform scale and the weight is written by hand, then typed again into the billing software. Two problems, one root cause: numbers a machine already knows are being copied by people, late.

What we build

For a unit like that, the system has three parts. Temperature and humidity sensors in each chamber report through a gateway every few minutes. The backend checks every reading against that chamber's limits and, when one drifts, sends a push notification and an SMS to the duty supervisor, then to the owner if nobody acknowledges. The Android app shows each chamber's live status and history, and at intake it reads the weight straight from a Bluetooth-enabled scale, attaches it to the trader's lot and shares the receipt. Traders can be given a simple view of their own lots and chamber readings, which shows them their stock is being looked after. Our page on software for cold storage units covers the billing and lot side.

The devices we work with

• GPS trackers on vehicles, usually read from the tracker provider's platform through its API rather than from the device itself.
• Weighing scales with Bluetooth or serial output, at intake, dispatch or on the shop floor.
• Sensors for temperature, humidity, power and door status, reporting through Wi-Fi, GSM or LoRa gateways.
• Smart meters and machine controllers, which often speak industrial protocols such as Modbus and need a gateway in between.
• Bluetooth accessories such as thermal receipt printers and barcode scanners.

We build the software side; the devices come from manufacturers you or we select. One rule matters more than any other: the device must have a documented way to share its data, whether an open protocol, an API or an SDK. A cheap sensor that only talks to its maker's own app cannot be integrated reliably, whatever the seller promises.

How it fits Indian sites

Power cuts and weak networks are routine at many plants and storage yards, so gateways need battery backup and must buffer readings through an outage, and the app has to say clearly when data is stale instead of showing an old reading as if it were current. Alerts go by SMS as well as push, because a phone on silent in a pocket at night needs more than a notification. Reading history matters for buyer audits and insurance claims. Manufacturers can use the same pattern to link machine counters to shift production reports; see software for manufacturing units.

How the build runs

Hardware changes the order of work. Before designing screens, we connect to the actual device, read its data and confirm the format matches its documentation, because that is where device projects most often go wrong. Then we pilot in one chamber, one vehicle or one production line for a couple of weeks before rolling out across the site. The IoT glossary entry explains the terms you will hear along the way.

What it costs

Android apps typically start around ₹65,000, but a device-connected app rarely sits at that floor. One device type with an app and alerts is usually a ₹1,00,000 to ₹2,50,000 project of 6 to 8 weeks; several device types with dashboards, history and multiple user roles move it to ₹2,50,000–₹6,00,000 and 10 to 16 weeks. Hardware is a separate cost, paid to its supplier. Running costs add SIM data for gateways, cloud hosting, SMS for alerts and an optional maintenance retainer. The app cost estimator gives a first figure for the software side.

When you do not need custom IoT work

Many tracker and sensor vendors ship a perfectly usable app of their own. If one vendor's dashboard already does what you need, use it and save the money. Custom work pays when readings must be combined with your own business data, such as a trader's lot and bill, or when devices from several makers need to appear on one screen. VS Tech Builders will tell you which side of that line you are on.