In this post I will show how to construct a password security lock circuit, which can be accessed by a 6-digit password. To be more precise it is alpha numeric password. Hardware for this Project We are going to utilize 4×4 keypad, which consists of 0 to 9 decimal values, two special character ‘#’ […]
New Circuit Projects
Sunrise Sunset Simulator LED Circuit
In this post I have explained how to make a sunrise/sunset simulator circuit using LEDs and just a couple of BJTs. The idea was requested by Mr. Jerry Circuit Objectives and Requirements Apparently natural daylight is best for humans in regulating our circadian rhythm. I would like to build an LED lighting circuit to control […]
How to Interface 4×4 Keypad with Arduino
In this post I have explained how to interface a 4×4 keypad with Arduino. We are going to see what is a keypad, how it is constructed and a how to program the Arduino to receive keystrokes form the keypad and print them in serial monitor. What is a keypad? A keypad is a portable […]
How to Generate Electricity from Piezo
Generating electricity from piezo could be as easy as making a flick with your finger….. curious to know how? I have explained more about this amazing device called piezo, which can be used for generating music as well as electricity. How Piezo Responds to Force and Electricity Piezo material is a crystalline substance which has […]
How to Make a Simple Math Calculator using Arduino
In this post, I will show how to construct a calculator using Arduino, which can perform far complex arithmetical calculation than an ordinary calculator. The motto of this post is not to make a calculator using Arduino, but to showcase the arithmetical capability of Arduino, which performs various complex data interpretations and calculations from the […]
0-60V LM317HV Variable Power Supply Circuit Diagram
The high voltage LM317HV series of ICs will allow to go beyond the traditional voltage limits of an LM317 IC and enable controlling supplies that may be as high as 60V. 0-60V Regulation with a Single IC LM317 Therefore now you can build a universal 0-60V regulated power supply circuit loaded with all the essential […]
