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Choose a W5500 Ethernet module by supply, SPI connections, controller support and network needs, with Epro prices and practical checks before ordering.

Connect MCP3008 to Raspberry Pi using compatible 3.3 V SPI, a bounded potentiometer input, verified pin assignments and raw-code checks before voltage scaling.

Choose an MCP7940N RTC by crystal, backup enable, oscillator status, power-fail timestamps and battery-backed SRAM rather than assuming automatic valid time.

Choose an MCP9808 temperature sensor by accuracy interval, conversion time, board heating, address options and alert behaviour rather than resolution alone.

Choose an LM393 comparator by exact variant, common-mode limits, output pull-up, reference stability and hysteresis rather than assuming rail-to-rail operation.

Compare TB6612FNG and DRV8833 motor-driver requirements, verify an ambiguous module listing and check supply, logic, stall current and control pins.

Wire a logic level converter between a classic ESP32 and a compatible 5 V I2C peripheral, then check voltage references, channel pairs and bus response.

Understand ULN2803 pinout, reversed output order, sink operation and the clamp-diode COM pin. Budget simultaneous current and package heat before choosing loads.

Build an IR sensor Arduino connection for a reflective obstacle module, then check digital output, active-low behaviour, threshold, target surfaces and sunlight.

Choose an INA219 current sensor by shunt value, bus voltage, current range and calibration, with Epro prices and clear limits for a low-voltage DC project.