A Module with GPRS Antenna, operation Wireless and SIM Card.

DS18B20 is a single-bus digital temperature sensor with features of ultra-small size, wide range of applicable voltage and measurable temperature and high resolution.

The SparkFun ESP8266 WiFi Shield is an Arduino compatible shield for the ESP8266 WiFi SoC – a leading platform for Internet of Things (IoT) or WiFi-related projects. There are a variety of designs based around the ESP8266, including tiny, modular boards and more accessible development boards like our very own SparkFun ESP8266 

A Whadda Universal Temperature Sensor Mounting Kit, used for measuring indoor and outdoor temperatures, controlling the rise/fall of temperature in homes, equipment, control of temperatures in some processes, visualization of the temperature on your website, control of the temperature of your pool, etc.

A Water Level Sensor 1/2Npt with 0-12VDC, from ProK.

A Water Flow Meter Sensor 6mm Hose designed for your Drinking Water Machine!

This is an Arduino-Compatible B25 Voltage Sensor Module.

Voltage Sensor Module.

Voltage Regulator for 5v Step-Up/Step-Down - Pololu

The Vma449 integrates the Voice Recorder ISD1820 and Playback CI to record a single message up to 20 seconds long. The recorded message is stored in the analog flash memory that keeps the message stored even in the event of a power failure. The module has an integrated microphone to record your message and buttons for recording, partial playback or full reproduction of the message functions.

VL6180X Time-of-Flight Distance Sensor Carrier with Voltage Regulator

The Pololu USB to serial adapter is great for connecting microcontroller designs to a personal computer. The adapter uses 3.3 V signal levels so you can connect it directly to any microcontroller running at up to 5 V without the hassle of an RS-232 to TTL level converter.

This UV Sensor is capable of detecting UV solar radiation using a simple UVM-30A chip. It can be easily configured for projects with Arduino to monitor UV Index, analyze UV-A lamps or DIY projects as plant growth analysis.

Kit Thermostat with LED Indicator - Velleman.

Detecting temperature changes has never been easier. The MCP9700 is a small thermistor type temperature sensor. 

Temperature Sensor - Grove

SW-420 Motion and Vibration Sensor Module.

A small Audio Speaker that is ideal for radio and amplifier projects.

A small Audio Speaker that is ideal for radio and amplifier projects.

The Grove - Speaker is a module consisting of power amplification and voice outputs. The volume can be adjusted by the integrated potentiometer . With input frequencies at different, the speaker generates different tones. Encoding the music in Arduino, make your own music box yourself!