Fig. 1 shows how to interface the Relay to microcontroller. There are 2 input channels. Each input is connected to the triggering coil of the respective relay. There are 2 output channels that each correspond to an input. When the input is energized, the relay turns on and the '+' output is connected to +12v. When the relay is off, the '+' output is connected to Ground. The '-' output is permanently wired to Ground.
Fig. 1 Interfacing Buzzer to Microcontroller
We now want to control the relay operations by using AVR Slicker Board. Here we are using one goodsky Relay. The relay consists of a coil and a switch. When the coil is energized, the switch closes, connecting the two contacts together. ULN2803 is used as a driver for port I/O lines, drivers output connected to relay modules. Connector provided for external power supply if needed.
Relay Module: PORTB.0 pin of AVR microcontroller is connected with the relay and it will be activated by making the port pin HIGH, Deactivated by making it LOW.
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