It can play up to 22KHZ, 12 bit uncompressed audio files of any length. This Shield solves many problems related to audio low quality with electronic projects with audio. It is useful if you need negative voltage. This shield generates negative voltage for Arduino. This Shield can detect concentrations of combustible gas in the air and read it as an analogue value. The CAN – BUS Shield adopts MCP2515 CAN bus controller with SPI interface and MCP2551 CAN transceiver to give CAN – BUS capibility to the Arduino. The Touchpad Shield allows you to build simple capacitive touch interfaces. 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. This Shield makes it easy to use a 16×2 Character LCD. It makes it easy to incorporate a motor into any of your projects. This Shield allows an easy control of motor direction and speed. It allows for easy connections between the breadboard and the Arduino.

The ProtoShield is a prototyping Shield that makes it easy to prototype. The Relay Shield is a module with 4 mechanical relays that provides you an easy way to control high voltage. You just have to plug the shield onto the Arduino board and then, connect it to your network. The Ethernet Shield allows you to connect your Arduino to the internet.

I’ve also wrote a list of 21 modules that you can buy for your Arduino for less than $2. You just need to plug them over the top of the Arduino board. There are countless types of shields to do countless tasks. Arduino shields are boards that will expand the functionalities of your Arduino.

Arduino mega pinout shield