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Learn how to upload code to Arduino Nano with cable, driver, board, processor and bootloader checks, a Blink sketch and upload-error troubleshooting.

Test an ADS1015 Arduino logger with the correct ADC model, left-justified signed decoding, gain-aware scaling and fresh-conversion checks after channel selection.

Choose an AHT20 I2C humidity and temperature module by carrier wiring, pull-up voltage, startup timing, busy-status handling and realistic installation limits.

Choose an ADS1220 ADC by input configuration, PGA headroom, reference, conversion rate and SPI timing rather than equating 24 bits with system accuracy.

Choose a TCS34725 color sensor by RGBC output, voltage, I2C address, gain and illumination, with checked Epro pricing and honest classification limits.

Set up TCS34725 with Arduino using verified I2C levels, the Adafruit library and repeatable RGBC sampling before attempting color classification.

Connect PCF8591 to Raspberry Pi with safe I2C pull-up levels, verified addressing, one known analog input and correct handling of the previous-conversion byte.

Check HC05 Bluetooth module price at Epro, then compare UART wiring, supply and logic levels, Classic serial compatibility, baud settings and range limits.

Read IRLZ44N datasheet pin assignments and run a small resistor-limited LED test with defined gate-off behavior, safe drive and honest measurement limits.

Use PIR motion sensor Arduino code with an HC-SR501-style module, allow warm-up time, read its digital output and diagnose retriggering and false events.