IO Expansion shield is one of the market favourites. Fast robotics prototyping made affordable and simple thanks to this design. Soldering and wiring often become a problem when a bridged connection happens and components break. Increasing time and cost for projects. Often, without this solution and a soldering station, wire cripping tools or soldering station, robot prototyping or electronics DIY becomes a very long term project.

The DFRobot Expansion shield introduced to the market the famous color code for sensors and actuators' input and output. The 3 pin format for Signal, Voltage, and Ground is extremely useful, especially if used altogether with our increasingly large range of modules, sensors, and devices that just fit.
Alternatively, the board includes power input for salvaged power supplies or laboratory power supplies. Very common Xbee socket for multipurpose wireless connectivity such as RF, wireless, Bluetooth.

The new version includes a voltage hardware setting through a jumper to allow compatibility with a bigger range of components at 3.3v like Raspberry pi, Due, and others.

It also includes a Servo external power, with a protective diode. This way you can enable a large range of servos from your Arduino.

The latest version features a convenient switch that lets you program your ATmega328 boards like UNO, while you have another Serial device connected like an Xbee. Switch it, program it, and get it back up and running with another switch. You don't need to disassemble your hardware or wiring.

A LED on top board and a reset button is in order to make it just a natural extension to Arduino boards. The LED is connected to pin 13.

Project 1. How To Build Your Own MechaGodzilla Armor! 56 Days To Make Wearable Monster Suit Using EVA & Gears!
Introduction: This project made a MechaGodzilla Armor with EVA plastic and gears! You can not only walk in the armor but also use gears to control the mouth and hands of the monster!

Project 2. Spectrophotometer Experiment Based on AS7341 Spectral Sensor
Introduction: This project uses DFRobot AS7341 Spectral Sensor to make a simple spectrophotometer, and carry out an experiment to measure substance concentration in different solutions by collecting data, fitting curve, etc.

Project 3. How to make a Smart Rock-Paper-Scissors Game Robot
Introduction: This project made a smart rock-paper-scissors robot and bring it to campus maker carnival.

Project 4. Build KnowFlow: automatic water monitor

KnowFlow is the name of this water quality monitoring device, based on Arduino Uno. It can automatically monitor 5 parameters of water: pH, Temperature, Dissolved Oxygen, Electronic Conductivity, ORP.

• Central Control Unit: Arduino Uno (DFRobot Bluno in this case) and Expansion Shield (DFRobot Expansion Shield V7.1 in this case)
• Water Sensors: pH (pH probe and pH circuit board); EC (EC probe and EC circuit board); ORP (ORP probe and ORP circuit board); Temperature (temperature probe and temperature circuit board); Dissolved Oxygen (DO probe, BNC and circuit board); real-time clock circuit board
• Data Storage: Micro-SD module, Micro SD card
• Fit and fix: mounting plate, waterproof box( 200mm_150mm_75mm), waterproof joint
• Other parts: Cables (Wires), breadboard, bolts and nuts, screws, battery, double-sided adhesive, write on tape, small wrench, spiral cable wrap

Project 5. How to Make An Automatic Water Changing System
Introduction: This simple system detects water quality through simulation Gravity: Analog pH Sensor / Meter Kit For Arduino and Gravity: Analog Turbidity Sensor For Arduino, and supplies and drains water through the submerged pump and solenoid valve.