Designing a DTMF based Home automation system - GSM | Relay control

Blog link : This video is an introduction to a GSM based relay control board i designed. The board has a 2G GSM module SIM800C onboard and a MP3 player which play audio responses like a IVRS system during an ongoing call like Amazon Alexa. The board can control AC appliances connected to the relays using DTMF control or MQTT based web app. Since the board talks , i call it VALTALK - v1:)