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Connect an RFID RC522 module to a classic ESP32 board at 3.3 V, read your own compatible tag UID, and check SPI wiring and security limitations.

Build a VL53L0X ESP32 range demo with verified 3.3 V wiring, Arduino library setup and status checks, then test target position and lighting systematically.

Choose a DS3502 digital potentiometer by separate logic and wiper-bias supplies, load limits, seven-bit resolution and volatile versus nonvolatile writes.

Integrate an AD9833 with Arduino by checking serial framing, reference-clock scaling, two-part frequency writes and explicit reset and output configuration.

Use MLX90614 with Arduino to distinguish object and ambient readings, verify voltage and SMBus wiring, and control optics before judging temperature accuracy.

Use a DHT11 with Raspberry Pi safely: check 3.3V wiring, GPIO numbering, Python-library support and common reading errors before building a monitor.

Choose W25Q32JV SPI flash by exact voltage variant, four-megabyte capacity, sector geometry, page limits and protection rather than assuming EEPROM-style writes.

Choose a MAX7219 display by matrix size, supply current, logic voltage and library support, with dated Epro prices for single and four-module boards.

Choose an ACS712 current sensor by range, sensitivity, supply and board construction, with Epro prices and low-voltage calibration checks before buying.

Build a PCF8574 Arduino button-and-LED demo with Wire, a released input bit and active-low LED wiring, then check address, timing and port behaviour.