Gsm module SIM900 interfacing with arduino

In this section, we will learn How to interface GSM module sim900 interfacing with arduino using softserial library, and code to control lights by sending sms to your sim module. SIM900A module work on AT commands. AT commands are instructions used to control a modem and is the abbreviation of  ‘attention’. some of AT commands are listed … Read more

Heart rate monitor with arduino uno

Build a heart rate monitor to check heart beat rate. Press Start button to Start the process and second button is used here for reset the counter. Circuit Diagram