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...