Case Study - Refrigerator Controller

The Customer

An India-headquartered group of companies having 15 business lines. A highly trusted, more than a century old brand. Manufacturing domestic refrigeration products for close to seven decades.

THE PROBLEM

  • No presence in the high-end refrigeration space
  • Would be a late entrant, and hence needed to leapfrog the competition
  • Upcoming regulations required higher energy efficiency

THE ANALYSIS

  • Better compressor technology
  • Better UI
  • Remote connectivity to IoT
  • Fault prevention

THE SOLUTION

Implemented a simple and intuitive colour-LED-based UI with CapSense input

THE OUTCOME

  • Created a new market in the high-end refrigeration space
  • Kept products relevant
  • Ownership of electronics

Technology Areas

  • Refrigeration Control
  • Machine Connectivity
  • Remote Monitoring & Control
  • Fault Prevention & Analysis
  • User Interface

TECHNICAL DETAILS

Refigerator_Controller

Hardware

  • A total of 11 PCBs – all double sided PTH
  • Schematics, BOM, Layouts & Gerbers: PADS from Mentor Graphics
  • Microcontroller: Microchip PIC24F 16-bit general purpose MCU
  • CapSense: Cypress CY8CMBR3018 controller
  • GPRS: SIMCOM SIM800C
  • Constant current source drivers for WHITE LED panels

Firmware

  • Code in C
  • IDE: MPLAB X

Software

  • Microsoft SQL Server Database on MS Azure
  • ASP.NET Webforms application for visualizing the data
  • IDE: Visual Studio, SQL Management Studio

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