Breakout board built around the Omron D7S, the smallest seismic sensor in the world. The D7S contains a three-axis accelerometer, of which only two axes are used while an earthquake is being detected; they can be selected by the user or automatically, according to how the sensor is tilted.

Compact board built around a high-sensitivity semiconductor smoke sensor, with a wide detection range, fast response, good stability and a long service life

Detects alcohol in exhaled breath like a breathalyzer, with analog and digital output and a threshold trimmer; power supply from 2.5 to 5 Vdc.

Breakout board based on the OMRON 2SMPB-02E pressure and humidity sensor

Board built around the HX711 chip, a 24-bit analogue-to-digital converter designed to interface a load cell with a microcontroller such as Arduino, Fishino or compatible boards

Obstacle detector made up of an infrared transmitter and receiver

Compact laser receiver module designed to accurately detect the presence of a laser beam. With dimensions of 1.52 cm * 2.22 cm and powered at 5V, it provides a high logic output when hit by the laser beam and a low output when no beam is detected. Ideal for security, tracking and object-detection applications.

This compact module uses a LASER as the transmitter and a phototransistor as the receiver. The beam emitted by the transmitter is reflected by the surface in front of it and hits the lens of the receiver (the lens focuses the reflected light onto the phototransistor), turning the phototransistor on