DFRobot diode assortment, 100 pieces

Pick level shifters by bus behavior: I2C/open-drain, auto-direction push-pull, direction-controlled buffers, or 3 V to 5 V logic. They are not universal adapters.

Components · Logic Level Converters · 21 parts

Sort prototyping boards, jumper leads, LEDs, controller boards, drivers, sensors, RTC modules and storage breakouts by job before treating them as substitutes.

Components · Other components · 12 parts

Character LCDs, SPI TFTs, e-paper modules and larger capacitive-touch TFT panels solve different display jobs. Treat display class, interface, controller, resolution, touch, refresh behaviour, storage, voltage and mounting as separate swap checks.

Displays · TFT & LCD displays · 25 parts

Choose between MQ gas sensors, VOC/eCO2 indoor-air sensors, true CO2 modules and particulate sensors without treating every air-quality breakout as the same detector.

Sensors · Gas & air-quality sensors · 28 parts