Relay 5v Module
The relay is designed by employing a tiny Driver circuit that consists of a semiconductor, Diode, and an electrical device. the semiconductor is employed to amplify the present so full current (from the DC supply – 9v battery) will flow through a coil to totally energies it. The electrical device is employed to produce bias to the semiconductor. And Diode is employed to forestall reverse current flow once the semiconductor is changed. each inductance coil produces equal and opposite voltage once changed suddenly, this could cause permanent harm to parts, therefore Diode should be accustomed forestall reverse current. A Relay module is definitely offered within the market with all its Driver circuit on the board otherwise you will produce it by mistreatment the higher than parts. Here we’ve got used a 5V Relay module
The relay is Associate in Nursing magnetic attraction switch, that is controlled by little current, and accustomed turn on and OFF comparatively abundant larger current. means that by applying little current we will turn on the relay that permits a far larger current to flow. A relay could be the ideal of dominant the AC (alternate current) devices, employing an abundant smaller DC current. usually used Relay is Single Pole Double Throw (SPDT) Relay, it’s 5 terminals as below:
When there’s no voltage applied to the coil, COM (common) is connected to North Carolina (normally closed contact). once there’s some voltage applied to the coil, the magnetic attraction field made, that attracts the coil (lever connected to spring), and COM and NO (normally open contact) get connected, which permit a bigger current to flow. Relays square measure offered in several ratings, here we have a tendency to used 5V in operation voltage relay, that permits 7A-250VAC current to flow.