SIM808 module is a GSM and GPS two-in-one function module. It is based on the latest GSM/GPS module SIM808 from SIMCOM, supports GSM/GPRS Quad-Band network and combines GPS technology for satellite navigation. It features ultra-low power consumption in sleep mode and integrated with charging circuit for Li-Ion batteries, that make it get a super long standby time and convenient for projects that use rechargeable Li-Ion battery. It has high GPS receive sensitivity with 22 tracking and 66 acquisition receiver channels. Besides, it also supports A-GPS that available for indoor localization.

Features :

• Ready to  plug & play.
• It can connect to various modules like sensors, servos, relays, buttons, potentiometers
• Each functional module has buckled port with VCC, GND and Output, which has corresponding port on the Sensor Shield, connected with a plain 2.54mm dual-female cable you may start playing already. Buckled brick cables are like cement for bricks, make the connections easier, secure and more professional looking.

Features: -With relay output, this module is used to detect the humidity and control related the device power directly. -This product make use of HR202 humidity sensor. -The comparator outputs drive relays directly. It connects to 220V AC or other devices. -With leads, sensor interface can be installed with pin. -It's easy to install with 4 0.3cm fixing bolt hole. -When ambient humidity exceeds the setting threshold value the relay sucks and shuts, what's more, the common terminal connects to the start. -If the ambient humidity below the setting threshold value, the situation will be counter. -Common, normally open and normally closed the three ports are equivalent to a dual-control switch. -When the relay coil is electrified, the common will connect to the normally open, otherwise, the common will connect to normally closed.

Arduino Adapter Shield Turn Nano v3.0 to Uno can turn your Arduino Nano into a normal style Arduino Uno, so you use it not only as arduino nano itself, but also as a Uno with more standard shield.

General Description GY-26-USART is a low cost plane digital compass module. The working principle is utilizing magnetoresistive sensor sensing the Earth's magnetic field component to get an azimuth angle. It communicates with upper computer through UART. Output format is ASCII. With solid state compass design, it has stable operation, high accuracy and advanced hard iron compensation function. It can overcome surrounding magnetic interference. Baud rate is optional. The product has three work modes; Normal mode, continuous mode and calibration mode. You can choose UART or IIC communication to use it.

A pH sensor is a scientific instrument that measures the hydrogen-ion concentration (orpH) in a solution, indicating its acidity or alkalinity. The pH sensor measures the difference in electrical potential between a pH electrode and a reference electrode.