Component

Supplier

Cost

(US$)

Moteino Microcontroller/radio Development Board

LowPowerLab

25

BME280 Temperature, Relative Humidity, Pressure WeatherShield

LowPowerLab

15

SHT31D Temperature, Relative Humidity Breakout Board

Adafruit Industries

14

Si7021 Temperature, Relative Humidity Breakout Board

Adafruit Industries

9

TSL2591 Digital Light Sensor Breakout Board

Adafruit Industries

7

Miscellaneous (protoboard, headers, batteries, holder)

6

Total

76