Chandigarh Smart City Weighbridges
One record for a city’s waste, from 14+ stations. A city’s waste moves through different kinds of facility. Each needs its own weighing pattern, yet the city needs one consistent set of figures. After a pilot, Chandigarh Municipal Corporation became a client, and Indivar and Maxim Mechatronics put all stations on one platform, with weighment data flowing in real time to the Chandigarh Smart City SCADA.
Smart City · Government
The challenge
Chandigarh Municipal Corporation wanted to know how much waste it receives, by material stream and by source area, across six types of facility: material recovery facilities, a solid waste processing plant, a wet waste segregation plant, a dumping ground, and construction and demolition and horticulture waste sites. Single-stream sites weigh each truck once or twice. Material recovery facilities need three weighings of each truck, because wet and dry waste come off in stages. Every weighment had to keep going when a site lost its connection, carry a photograph as evidence, and reach the city’s SCADA without separate data entry.
The solution
Indivar was the software partner to Maxim Mechatronics, which supplied and installed the weighbridges. At each weighbridge a station unit, a Raspberry Pi running a compiled Go application with a local SQLite database, runs the weighing cycle: the RFID tag is read, sensors and a traffic light guide the driver into position, voice prompts play in English, Hindi or Punjabi, and a camera photographs the vehicle. Every weighment is saved locally first and published over MQTT to the central control node, a Node.js and PostgreSQL platform, with photographs following through their own upload queue. Single stations and three-station groups feed the same data model. At a material recovery facility a truck is weighed on entry, unloads wet waste, is weighed at the centre, unloads dry waste and is weighed at the exit; the three weights sit on one transaction and give the wet, dry and total figures. Master data and station updates are pushed from the centre, so stations are managed without site visits. The work started as a pilot, delivered over about five to six months, and the corporation is now a client.
The Outcome
Architecture at a glance
How the pieces fit together, layer by layer.
Raspberry Pi · Go · SQLite
Saves every weighment locally first and drives the RFID readers, sensors, traffic lights, speaker and cameras
MQTT
Transactions up, master data down, with automatic retry when a sync fails
Node.js · PostgreSQL · Docker
Holds master data, transactions and images, and pushes master data and updates to every station
SCADA
Real-time weighment data to the Chandigarh Smart City SCADA
A look at the live dashboard
The live control-node dashboard used by the city administration. Vehicle numbers and per-material figures are hidden.
From the animation to the live site
How the automated weighing cycle works
The unmanned weighing cycle, step by step: identify, position, settle, photograph and sync. Indivar software on Maxim hardware.
Three weighbridges, one record: live footage from a material recovery facility
Real footage from Chandigarh: each truck is weighed three times with no operator, and the differences give the wet and dry waste.
Transcript
Each truck crosses three weighbridges and nobody operates them. The first weighing records the full truck. The truck unloads its wet waste and is weighed again, and the drop between the two readings is the wet waste. It then unloads its dry waste and is weighed a third time, and that drop is the dry waste. The weights and photographs from all three stations land on one transaction in the central platform.
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