Parts library

A basic indicator light. Always pair with a current-limiting resistor.

2 pins · works with UNO / ESP32 / PICO

Momentary switch, wired with the internal pull-up so no extra resistor is needed.

2 pins · works with UNO / ESP32 / PICO

Measures distance from 2 cm to ~4 m by timing an ultrasonic echo.

4 pins · works with UNO / ESP32 / PICO

Digital sensor for ambient temperature (±0.5 °C) and relative humidity.

3 pins · works with UNO / ESP32 / PICO

Crisp 0.96" monochrome display on the I²C bus — two data wires, endless dashboards.

4 pins · works with UNO / ESP32 / PICO

Plays tones with the tone() function — from gentle chirps to full alarms.

2 pins · works with UNO / ESP32 / PICO

180° positional servo — the workhorse of latches, feeders and flags.

3 pins · works with UNO / ESP32 / PICO

Detects warm bodies moving up to ~7 m away. The classic security-project sensor.

3 pins · works with UNO / ESP32 / PICO

Reads ambient brightness through a simple voltage divider.

3 pins · works with UNO / ESP32 / PICO

Corrosion-resistant probe that reads how thirsty your plant is.

3 pins · works with UNO / ESP32 / PICO

Lets your microcontroller switch pumps, fans and lamps it could never drive directly.

3 pins · works with UNO / ESP32 / PICO

Individually addressable RGB pixels — one data wire, all the colors.

3 pins · works with UNO / ESP32 / PICO

A knob that reads 0–100 %. Perfect for thresholds, brightness and volume.

3 pins · works with UNO / ESP32 / PICO

Reads 13.56 MHz cards and fobs — the key to access-control and treasure-chest builds.

4 pins · works with UNO / ESP32 / PICO

Sniffs out CO₂-equivalent gases, smoke and general bad air.

3 pins · works with UNO / ESP32 / PICO

Endless rotation with a push-click — the perfect menu controller.

5 pins · works with UNO / ESP32 / PICO