A Grove sensor designed for indoor air quality testing. 

DFRobot Gravity Analog TDS Total Dissolved Solids Sensor Meter 3.3~5.5V Compatible for Water Quality Testing

SIM808 GSM/GPRS/GPS Bluetooth Compatible Development Board With GPS Antenna COM45 ,R17

MOD-TCA9548A CJMCU-9548 TCA9548A 1-to-8 I2C 8-Channel IIC Multiplexer

mini micro sd card reader module

GY- SGP30 AIR QUALITY GAS SENSOR TVOC ECO2 CARBON DIOXIDE MEASUREMENT FORMALDEHYDE MODULE

Ublox GPS NEO-8M GPS module GY- NEO8MV2 (with Battery)

"Ublox NEO-7M GPS Module with EEPROM for C/AeroQuad with Antenna （with Battery）

esp8266 ESP-01 Adapter Module 3.3-5 V (Arduino compatible)

AS608 Fingerprint Reader Sensor Module Optical Fingerprint Fingerprint Module

Mini Spy Camera with Trigger for Photo or Video

Tiny RTC I2C Module DS1307 Clock 24C32 Memory