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Choose a MAX31855 module by thermocouple variant, input isolation, cold-junction placement, supply compatibility and fault handling rather than resolution alone.

Choose a CD4017 decade counter by one-hot output behaviour, clock and inhibit timing, reset state, supply compatibility and actual output-current limits.

Choose a PCA9546A I2C switch by branch isolation, channel masks, pull-ups, pass-voltage requirements and reset recovery rather than assuming automatic address changes.

Build a W5500 Ethernet bench connection with verified module power, Uno SPI wiring and DHCP code, then distinguish hardware, link and address failures.

Choose an RV3028 RTC by exact module, backup configuration, charger safety, reset flags and EEPROM behavior rather than assuming board-level nanoamp consumption.

Choose an MCP2515 CAN module by oscillator, transceiver, SPI levels and termination. Understand Classical CAN limits and why loopback is only a first test.

Choose an MPU6050 module by its real six-axis digital functions, supply and bus levels, mounting, library support and limits on heading or position estimates.

Choose an HX711 module and compatible load cell by bridge wiring, capacity, mounting, voltage and calibration needs, with current Epro listing prices.

Build a MAX7219 Arduino matrix test with a single 8x8 module, LedControl code and checks for input direction, safe power, brightness and orientation.

Choose a MAX232 RS232 to TTL converter by actual interface, five-volt supply, capacitor requirements and signal direction, without confusing MAX3232 or USB adapters.