Simple Electronics

This is just a simple Processing program and its corresponding Arduino program for controlling the digital pins of Arduino. It is done by using the processing serial library  Processing code import processing.serial.*; Serial n; color c1,c2,c3; color h1,h2; boolean onb0=false; boolean onb1=false; boolean onb2=false; boolean onb3=false; boolean onb4=false; boolean onb5=false; boolean onb6=false; boolean onb7=false; boolean onb8=false; boolean onb9=false; boolean onb10=false; boolean onb11=false; boolean onb12=false; boolean offb0=false; boolean offb1=false; boolean offb2=false; boolean offb3=false; boolean offb4=false; boolean offb5=false; boolean offb6=false; boolean offb7=false; boolean offb8=false; boolean offb9=false; boolean offb10=false; boolean offb11=false; boolean offb12=false; boolean onb13=false; boolean offb13=false; void setup() {   size(800,800);   n=new Serial(this,"/dev/ttyUSB0",9600);   c1=color(80);   h1=color(255,0,0);   c2=color(255);   h2=color(0,255,

     From m i cro-contro l ler we can not connect a m o tor directly because m i cro-controller can not give sufficie n t current to drive a m o tor. Motor dri v er is a current enhancing device, it can also act as  s witching  d evice. Thus,  we insert m o tor driver in between m o tor and m icro-controller. Motor driver takes the input sign a ls from micro-contr o ller and generate corresponding enhanced output for m o tor.  Here, I introduced a low cost motor driver circuit using a SPDT relay module. Many motor driver circuits are available in market . But, they can withstand only small values of current. The driver circuits which can withstand more than 7 Amps are costly. The commonly used L293D driver can pass only 1 Amps. And the L298 can pass only 2 Amps. So It will be good if we have a low cost motor driver which can withstand more than 7 Amps. The figure shows an SPDT relay. It has 5 terminals as shown in the figure