The 4*4 matrix keypad is a basic keyboard without a touch sensor used for microcontroller projects. It is easy to connect and use. It comes with a cable with easy installation. It gives convenient adhesive backing provides a simple way to mount the keypad in a variety of applications.

MP3 Decoder Board is easy to use board mostly used to DIY music player. It can be directly connected to the speaker and be used. It can be operated with 5v battery. It has 4 functional buttons and a led indicator in-built.

GY-45 MMA845x Sensor, digital triaxial modules is embedded functions with flexible user-programmable option. Its mostly used for Static orientation detection, E-compass application and many more. It has 14-bit and 8-bit digital output  with user selectable dynamic range of  ±2g/±4g/±8g. It easy to use . It has features of vibration detection and pulse detection.

The Audio Amplifier Module based  on LM386 chip is a mono audio amplifier that can be used to boost up the volume of  microphone , mp3 player etc with low voltage audio signals. It operates on the voltage range between 4V to 12 V. It has on board power indicator.

The PCF8591 Module(ADC-DAC)  is a 8-bit CMOS data acquisition devices. It  has the four analog inputs.The three address pins in PCF8591 can be used in hardware address programmed 8 PCF8591 device allows access to the same I2C bus, without the need for additional hardware.The two-wire bidirectional I2C bus is  used to transmitted the input and output of the address, control and data signals and many more.  IT has on chip track and hold circuit in-built.

A system designed to detect unauthorized entry into building easy to install with reliable performance. Usually used to detect whether a door is open or closed. Connects to the goose via Analog Input or CCAT and receives alerts via email or SNMP.

Features

• 5V relay can be used as a microcontroller development board module can be used as a home appliance control
• 5 V-5v TTL control signals
• control DC or AC signal can control the 220V AC load
• the increase in transistor drive a relay coil, control pins high impedance
• the control pins with pull-down circuit, prevent floating relay malfunction
• high quality, pin colors (black, yellow) were shipped
• blue KF301 terminal control measure and easy to wire
• 4 positioning screw hole diameter 3mm center hole spacing of 20mm x 40mm
• compact circuit board

Package Includes:

• 1 x 5V 10A 1 Channel Relay Module compatible with Arduino

1. The 2 channel 5V Relay module board is used to control 2 applications with same board and it has  high voltage and current load such as motor lamp. It is good in safety with wide range of controllable voltage. It is Ideal for single chip microcomputer, household appliance control, etc.It has led indicator for power and status in-bulit. In this when jumper is connected to low pin the low level is trigger and when connected to high pin high level is trigger.

The 4 channel 5V Relay module board is used to control high voltage and current load . It provides 4 relays for its use. It is good in safety with wide range of controllable voltage. It is Ideal for single chip microcomputer, household appliance control, etc. It has led indicator for power and status in-bulit. In this when jumper is connected to low pin the low level is trigger and when connected to high pin high level is trigger.

The 8 channel 5V Relay module board is used to control high voltage and current load . It provides 8 relays for its use( we can control 8 application with this single board). It is good in safety with wide range of controllable voltage. It is Ideal for single chip microcomputer, household appliance control, etc. It has led indicator for power and status in-bulit. In this when jumper is connected to low pin the low level is trigger and when connected to high pin high level is trigger.

A solid start relay kind of mechanical relay that allows to control high – voltage AC loads from lower voltage DC control circuitry. It can be triggered at low level. It has stable performance with LED in-built.

The two channel solid state relay module has many no moving parts .It is faster, reliable and has longer life than of traditional mechanical relay. The two channels can be controlled separately. It can be used in various areas such as computer peripheral interface , temperature/speed adjustment etc.