interfacing with relay as a switch. | Microcontroller › AVR › interfacing with relay as a switch. This topic has 1 reply, 2 voices, and was last updated 9 years, 4 months ago by Ashutosh Bhatt. Viewing 2 posts - 1 through 2 (of 2 total) Author Posts April 26, 2015 at 12:54 pm #3647 Vatsal UpadhyayParticipant for my project i want to interface a relay with atmega 8 to work as a switch,which opens and close acoording to pir sensor input to atmega 8. so please help me with appropriate ckt diagram for that. May 1, 2015 at 11:17 am #12849 Ashutosh BhattParticipant to connect relay with Atmega8 use ULN2008 chip. its very simple circuit Author Posts Viewing 2 posts - 1 through 2 (of 2 total) You must be logged in to reply to this topic. Log In Username: Password: Keep me signed in Log In