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Overview Most people reading this article are probably familiar with Arduino or at least have heard the name. In this article, we try to introduce this platform in more details and study it from a critical point of view. Furthermore, we will point out the features we have come to discover in our experiences that have not been appropriately addressed. In the first section of the article, we discuss Arduino’s past, why and how it came to life and then study its components. In the second section, we b...

Overview A keypad is a device that can be used to receive input data from user. In this project, you will first learn how to interface a 4x4 keypad with Arduino, and then you will Build a simple calculator using a keypad. What You Will Learn What is keypad Different kind of keypads How does keypad work How to interface keypad with Arduino How to interface keypad in different methods Build a calculator How Does A Keypad Work? Since past until now, there has been various methods to en...

AP3216 Sensor Features The AP3216C is an integrated ALS & PS module that includes a digital ambient light sensor [ALS], a proximity sensor [PS], and an IR LED in a single package. This module is well suited to applications under clear glass or darkened glass. The proximity function is targeted specifically towards near field application and detects external object with simple configurable zone controlled by registers.  Note You need a 220 to 470 ohm resistor to interface this module. ...

CJMCU-0201 Double Touch Sensor Features A touch sensor is a type of switch that only has to be touched by an object to operate. Touch sensors work completely similar to a switch. This sensor has two separate pads and can be used as two separate switches. Note When this switch is subjected to touch, the output voltage will be HIGH, otherwise it is LOW. Note The output current is very low (about 40 mA). If you want to connect a higher current device to this switch, you must add a rela...