Contact person: Business Client

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Location: India

Budget: Recommended by industry experts

Time to start: As soon as possible

Project description:
"I need a three-line 7-segment LED display that can show three separate integer values coming directly from an RS485 Modbus RTU device.

Display layout
• Line 1: 7 digits
• Line 2: 5 digits
• Line 3: 5 digits

Core requirements
• Poll the Modbus slave in real time and extract three holding-register or input-register integers (exact addresses will be supplied once we start).
• Refresh the display instantly whenever a new value arrives—no noticeable lag.
• Retain leading zeros only when the data naturally contains them; otherwise keep the display clean.
• Handle communication loss gracefully (e.g., blank the line or show “—”).

Deliverables I expect
1. Schematic and BOM for the driver electronics (microcontroller, RS485 transceiver, digit drivers, power regulation).
2. Well-commented firmware source code ready to compile (Arduino, STM32, ESP32, or similar—your call, as long as it is open source tool-chain friendly).
3. Wiring diagram that matches the three-line mechanical arrangement.
4. Brief setup guide so I can flash the code and connect the display to my Modbus master with minimal fuss.
5. One short video or set of photos proving the display updates in real time from a live Modbus source (virtual or hardware).

Nice-to-have but not mandatory
• Configurable slave ID and register addresses via dip-switches or a simple serial menu.
• Screw-terminal or plug-in connectors so I can swap panels easily.

If you have already built similar Modbus display panels, feel free to mention your approach or share a clip. I’m available to answer protocol or addressing questions quickly so we can keep the build moving." (client-provided description)