Arduino sensors can measure anything: temperature, light, movement and humidity.
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Sensor shield v5.0 $ 9.69
24 sensor kit $ 22.20
37 sensor kit $ 20.70
45 sensor kit $ 20.70
9 gas sensors kit $ 20.40
Voltage sensor $ 1.22
Voltage sensor $ 2.75
20x GL5528 LDR $ 9.25
5x GL5537 LDR $ 3.17
5x GL5528 LDR $ 2.38
HC-SR04 ultrasonig distance sensor $ 16.51
HC-SR04 ultrasonig distance sensor $ 2.38
HC-SR501 motion sensor (PIR) $ 5.51
HC-SR501 motion sensor (PIR) $ 2.50
DHT11 temperature sensor $ 4.79
DHT11 temperature sensor $ 2.81
DHT22 temperature sensor $ 6.89
DHT22 temperature sensor $ 6.77
1-wire DS18B20 temperature sensor $ 4.65
1-wire DS18B20 temperature sensor $ 2.07
1-wire DS18B20 water proof temp. sensor $ 17.87
1-wire DS18B20 water proof temp. sensor $ 4.39
BME280 temp, humid. & atmosph. pressure $ 5.44
Air quality sensor CO, NO2, NH3 $ 49.47
Touch sensor $ 8.31
Touch sensor $ 2.26
Gyro, accelerometer and magnetic field $ 14.90
Capacitive soil moisture sensor $ 4.79
Capacitive soil moisture sensor $ 8.78
CZN-15E sound sensor $ 17.52
CZN-15E sound sensor $ 3.23
Color sensor $ 9.60
10kg pressure sensor $ 7.20