It had been a long time since i wanted to make a building automation system. In fact it was the first product i ever dream’t of making. Time passed and i didn’t quite find the time and interest to venture into it as i felt that building automation is a old concept and there are too many players doing the same stuff.

So i designed this board, which can control the relays on board, based on the inputs provided either from cloud or from a call using DTMF.

Features :
For the first iteration we designed it to have the following features,

4 cube Relays driven by MOSFET’s to control 110V to 230V AC appliances
SIM800C 2G Quadband GSM module for cloud/call connectivity with micro SIM card connector
External Whip Antenna with right angle SMA connector
MP3 player with micro SD card
STM32 Cortex M0 Low power MCU with RTC
Switching power supply to take inputs from 5V to 24V DC
DC power jack for power input
SWD connector for programmi