Set made up of two TCRT5000 reflective sensors and a small control board based on the LM393 chip. When one of the sensors comes close to a light-coloured object, the strength of the received signal rises and the LED on the control board turns red (digital output high)

Built around the Allegro ACS712ELCTR-20A-T chip, this current sensor reads AC or DC currents between 0 and 20 A

Small board based on the InvenSense MPU-6050 sensor, which contains a 3-axis MEMS gyroscope and a 3-axis MEMS accelerometer

Analog 3-axis accelerometer based on the ADXL345 chip by Analog Devices

Based on the Allegro ACS712ELCTR-05B-T chip, this current sensor can measure AC or DC currents between 0 and 5 A

Compact breakout based on the AMS CCS811 air-quality sensor, the Bosch BMP280 digital pressure sensor and the Silicon Labs Si7021 temperature and humidity sensor

Breakout board based on the WCS1700 current sensor and the LM393 chip. It measures alternating current (max

Module that reads the current and raises an alarm when a current threshold is exceeded

Built around the Sensirion SGP30 air quality sensor, this very small breakout board reports the carbon dioxide concentration (telling you how stale the air in a closed room is) and the TVOC (Total Volatile Organic Compounds), that is the concentration in parts per billion of airborne particles

Small module built around the Amphenol SGX Sensortech MICS-6814 air quality sensor