Arduino shields are boards that will expand the functionalities of your Arduino. You just need to plug them over the top of the Arduino board. There are countless types of shields to do countless tasks.
I’ve also wrote a list of 21 modules that you can buy for your Arduino for less than $2.
The Ethernet Shield allows you to connect your Arduino to the internet . You just have to plug the shield onto the Arduino board and then, connect it to your network. Pretty simple.
2. Relay ShieldThe Relay Shield is a module with 4 mechanical relays that provides you an easy way to control high voltage.
The ProtoShield is a prototyping Shield that makes it easy to prototype. It allows for easy connections between the breadboard and the Arduino.
This Shield allows an easy control of motor direction and speed. It makes it easy to incorporate a motor into any of your projects.
This Shield makes it easy to use a 16×2 Character LCD. With this, it is possible to control a 16×2 Character LCD, up to 3 backlight pins and 5 keypad pins using only the two I2C pins on the Arduino.
The Touchpad Shield allows you to build simple capacitive touch interfaces.
The CAN–BUS Shield adopts MCP2515 CAN buscontroller with SPI interface and MCP2551CAN transceiver to give CAN–BUS capibility to the Arduino.
This Shield can detect concentrations of combustible gas in the air and read it as an analogue value. Useful to make a smoke detector system.
This shield generates negative voltage for Arduino. It is useful if you need negative voltage.
This Shield solves many problems related to audio low quality with electronic projects with audio. It can play up to 22KHZ, 12 bit uncompressed audio files of any length. Audio files are read off of an SD/MMC card. With this shield, it is possible to add high quality audio to your projects.
The CISECO ProtoX Shield is a Prototyping board with SMT pads and serial breakout.
With this Shield you can connect up to 64 buttons to your Arduino. Some cool projects with this shield include musical intruments, cool computer interfaces, etc.
The joystick Shield provides simple analog inputs and four separate buttons and one button under the joystick itself.
The GSM/GPRS Shield allows you to connect your Arduino to GSM/GPRS cell phone network. It allows you to dial a phone number or send a text message to a friend via easy to use AT commands.
This Shield is a game adapter for Arduino or anything with an SPI interface. It has plugs for a VGA monitor and stereo speakers.
The microSD Shield equips your Arduino with mass-storage capability, so you can use it for data-logging or other related projects.
This Shield is perfect for any 13.56MHz RFID or NFC application. It can read and write tags so, it is perfect to use for RFID-tag projects.
With this shield from Adafruit, you can control a 5×8 matrix of RGB LEDs using only one pin.
The MP3 Player Shield provides a simple way to add sound effects or music to your projects.
With this Shield it is possible to reduce the complexity of the camera control interface. It uses I2C interface for the sensor configuration and SPI interface for camera commands and data stream.
The GPS Logger Shield comes with a GPS module and is designed to log data to an SD card.
The Wireless SD Shield allows the Arduino to communicate wirelessly using a wireless module. The shield includes a SD car slot.
This Shield is a well-equipped network processing unit that can simplify the network connecting process. It can lower the MCU’s demand on software, which makes it a perfect solution for embeded applications of low-cost, low-power consumption MCU.
ESP8266 Wi-Fi Shield is an Arduino compatible shield for the ESP8266 WiFi SoC – a leading platform for Internet of Things (IoT) or Wi-Fi related projects.
This Shield includes an easy to use Bluetooth SPP (Serial Port Protocol) module, designed for transparent wireless serial connection setup.
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