ATSAMD20J16B-MN

[035] ETHERNET-BASED SMART LOCKER CONTROLLER

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Managing a large number of compartments with individual state detection calls for a well-thought-out I/O architecture. The core here is an ATSAMD20, which handles input multiplexing — lots of IR sensors to monitor, not much room for redundant hardware.

Each channel is watched by an infrared sensor, with state updated continuously in real time. For communication with the supervisory system, Modbus over Ethernet was the obvious pick: robust, standard, and easy to drop into any industrial infrastructure. Daisy-chained Ethernet keeps expansion simple and cuts down on cabling. A solid example of what a modular, scalable architecture actually looks like in practice.

[020] CONTROL BOARD FOR ELECTRONIC LOCKS

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Driving electronic locks and LEDs at 24 V with Modbus Ethernet telemetry — the project looks straightforward until the channel count starts climbing.

Multiplexing is at the heart of the architecture. Rather than dedicating a full hardware path to every signal, the design optimizes resources with careful sequencing logic. The ATSAMD20J16B-MN orchestrates everything: output state management, multiplexing timing, control firmware, and network telemetry.

Modbus Ethernet turns the board into a networked node: it can receive commands and report its status within an existing IP-based control infrastructure. On the hardware side, separating 24 V power outputs, control logic, and the communication layer required real layout and grounding discipline.