Learn electronics, coding, and projects — step by step.
In this tutorial, you will be able to use the SIM800L GSM module for controlling anything through SMS. To do that, we just need to parse the incoming SMS from SIM800L through serial communication. In this Arduino sketch, we will be parsing the following: Find the string “CMT:”, then save the sender’s mobile number for […]
In this article, I will discuss how we can use a matrix keypad for text entry purposes which is similar to T9 keypad used by Nokia and other bar phones. The circuit is the same as the previous tutorial. Be sure to check it out here: 4×4 Keypad Introduction CIRCUIT DIAGRAM BILL OF MATERIALS Arduino […]
Keypad is commonly use in devices like ATM machine, microwave oven, safety vault, security door lock, and many more. In this tutorial we will focus on the most popular to electronics enthusiasts and tinkerers which is a 4×4 matrix keypad. We will discuss how it works and at the last we will provide an example […]
In this project idea, we will create a simple voltmeter by taking advantage of the Arduino’s analog to digital converter. The problem is it can only measure up to 5V, if you exceeded this limit the Arduino could be damage. The workaround is to use a voltage divider circuit. In light of that, let us […]
In this project, we will create a door lock security system using an Arduino. The idea is as follows: The door lock is controlled by entering the correct password. If user password entered is correct, open the door lock If user password entered is wrong, an alarm will be triggered (alarm sound and flashing of […]