Raspberry Pi: 

The Raspberry Pi is a low cost, credit-card sized computer that plugs into a computer monitor or TV, and uses a standard keyboard and mouse. It is a capable little device that enables people of all ages to explore computing, and to learn how to program in languages like Scratch and  Python.    

Accelerometer 

An accelerometer is a basic technology that converts  mechanical motion into an electrical signal. It is an electromechanical device  that measures acceleration force, whether caused by gravity or motion.                                                                    

Working: 

✓Step 1: The system makes use of a hand motion reading system equipped with motion and flex sensors along with a speaker unit. 

✓ Step 2: This system is powered by battery-powered circuitry to run it. A raspberry pi is used for processing the data and operating the system.  

✓Step 3: The system consists of around 10 stored messages like need help, where is the toilet/washroom and so on that help, mute people convey basic messages.  

✓Step 4: The system reads a person's hand motions for different variations of hand movement.  

✓Step 5: It also consists of a trigger sensor in order to indicate that the person wishes to activate the system and speak something.  

✓Step 6: This ensures the system does not speak when the person is just involuntarily making hand motions.  

✓Step 7: The raspberry pi processor constantly receives input sensor values and then processes them.  

✓Step 8: Now it searches for matching messages for the set of sensor values.    

✓Step 9: Once it is found in memory this message is retrieved and is spoken out using text to speech processing through the interfaced speaker.  

✓Step 10: Thus we have a fully functional smart speaking system to help mute people communicate with regular people using a simple wearable system.