BME280 sensor module
Temperature, humidity and pressure in one I2C chip, the base for a weather station.
Recommended gear
Tools and parts that work well for the projects on this site. We pick cheap things that are easy to find in big stores.
Sensors
BMP280 sensor module
Temperature and pressure without humidity, cheaper than BME280.
BME680 sensor module
Adds an air quality reading to temperature, humidity and pressure.
DS18B20 waterproof probe
Measures water, soil and pipes. Several probes share one wire.
MH-Z19B CO2 sensor
NDIR CO2 sensor over UART, a long-time favorite of DIY air monitors.
MPU6050 module (GY-521)
Accelerometer and gyroscope for balancing robots and gesture controls.
HC-SR04 ultrasonic sensor
Measures distance up to 4 m with sound, the usual eye of a first robot.
INMP441 I2S microphone
Digital microphone for voice, sound meters and music visualizers.
Capacitive soil moisture sensor v2.0
Does not rust in the soil like the cheap fork sensors.
MAX30102 heart rate sensor
Pulse and blood oxygen from a finger, for wearable experiments.
Some store links are partner links: the site gets a small share of the purchase, the price stays the same for you.