Relay circuit module
Circuits are somewhat like programming, sometimes you use ready made functions when you program. It is useful to have some basic circuit modules around you in case you need to test something or want to work on your next robot and don't need to create everything from scratch. In this article or tutorial, I'll share with you making a 12V relay circuit module. A relay circuit is used to control (switch on/off) AC or DC voltage line without affecting your micro-controller (Arduino, Raspberry Pi, PIC, AVR...etc.) or digital control unit, at least when done right :)! When you toggle the voltage on a relay coil, it works as a mechanical switch, moving a metal arm/contact from one node to the other, literally switching on or off. Read more about relays here I started drawing the circuit using Eagle PCB design software , there is a free version for personal use here Eagle Express . Schematic: PCB: Once you have the PCB design ready, you want to print and transf...