Using Raspberry Pi - Embedded system

Schools, colleges and TV Contests, there is a fastest finger first system used to declare who pressed the button first so that  the group which has pressed push button first gets an opportunity to answer. But the problem is when 2 or more teams press the button within a very small time gap.  The Raspberry Pi - Embedded system based system takes care of this problem. It is built with Raspberry Pi board and SSR modules are used for switching.

The Raspberry Pi runs a standard Raspbian Linux distribution with Fi-fi dongle, installed GPIO library and software written Python. Most of the coding is done on the Raspberry Pi.

HDMI output is connected to an LCD monitor through this one will come to know what was the  sequence buttons were pressed by the teams. This happens when 2 or more teams press the button simultaneously. This type of Using Raspberry Pi - Embedded system circuit can also be controlled via an SSH conncetion using VX ConnectBot software on an Android smartphone.

You need VX ConnectBot software, which you can download from play store on any Android smartphone. Put it in Start tethering or hotspot mode and connect Raspberry Pi.

A solid state relay is used as a switching device. It has a sensor that responds to an appropriate input signal. The relay is designed to switch either AC or DC to the load. It serves the same function as an electromechanical relay.

The codes are written in Python language which detects the push button switches that are connected to the glowing bulbs, which show the fastest finger first contestants’ sequence.

Each bulb holder and push button switch is fitted on a general purpose board/ box having separate pair of wires for each bulb holder and the switch. 5v supply is given to relay module from Raspberry Pi. Raspberry Pi initialises the push button switches pins as input and clears the SSR pins to switch off the indicators. 

The moment contestants press their allotted switches, contestants names and their team description will be displayed on the LCD screen provided for the purpose. Also respective indicator bulbs glow. Thus Raspberry Pi is perfect solution for fastest finger first type projects.

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