interfacing | Microcontroller › 8051 › interfacing This topic has 2 replies, 3 voices, and was last updated 7 years, 7 months ago by Ashutosh Bhatt. Viewing 3 posts - 1 through 3 (of 3 total) Author Posts April 13, 2015 at 12:15 pm #3806 sukhmanParticipant how to interface relays with ULN2803 in project home appliances control by voice…..plz reply fast…thnx.. January 18, 2017 at 7:49 am #14348 Hari Prasaath KParticipant Hi, If u have uln2803 there are schematics available in net so you can refer to it. Else you can buy a uln2803 relay module available online. January 25, 2017 at 7:12 pm #14373 Ashutosh BhattParticipant ULN2803 connections are easiest one. one side input – other side output thats all relay coil terminal is connected to output of chip Author Posts Viewing 3 posts - 1 through 3 (of 3 total) You must be logged in to reply to this topic. Log In Username: Password: Keep me signed in Log In