Arduino sensors can measure anything: temperature, light, movement and humidity.
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Sensor shield v5.0 $ 2.02
24 sensor kit $ 18.70
37 sensor kit $ 9.73
45 sensor kit $ 18.37
9 gas sensors kit $ 14.28
Voltage sensor $ 1.13
20x GL5528 LDR $ 1.39
1x GL5528 LDR $ 0.34
1x GL5537 LDR $ 0.34
HC-SR04 ultrasonig distance sensor $ 2.02
HC-SR501 motion sensor (PIR) $ 1.98
DHT11 temperature sensor $ 2.35
DHT11 temperature sensor $ 2.54
DHT22 temperature sensor $ 3.54
DHT22 temperature sensor $ 7.85
1-wire DS18B20 temperature sensor $ 1.83
1-wire DS18B20 water proof temp. sensor $ 2.84
1-wire DS18B20 temperature sensor $ 2.20
BME280 temp, humid. & atmosph. pressure $ 5.04
Air quality sensor CO, NO2, NH3 $ 29.29
Touch sensor $ 1.73
Gyro, accelerometer and magnetic field $ 5.48
Capacitive soil moisture sensor $ 3.66
CZN-15E sound sensor $ 1.40
Color sensor $ 4.95
10kg pressure sensor $ 5.23