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Solar Pocket LED Light Circuit

The post explains a simple low cost solar pocket LED light circuit which could be used by the needy and, underprivileged section of the society for illuminating their houses at night cheaply. The idea was requested by Mr. R.K. Rao

"WELCOME" Chasing LED Display Circuit

The post explains how to make a chasing "WELCOME" display circuit sign board, which illuminates each alphabet sequentially until all the 7 alphabets are lit and then the whole display shuts off, the cycle continues permanently as long as the circuit is powered.

Transformer Winding Counter Circuit

The post details how to make a simple transformer winding counter circuit using ordinary LEDs and also through an advanced digital display circuit. The idea was requested by one of the dedicated readers of this blog

How to Send SMS Using GSM Modem and Arduino

In this article we are going to learn, how to send SMS using GSM modem which is controlled by Arduino. Let us see, what GSM modem is, how to interface it with Arduino, how to send SMS with the setup.

How to Interface 4x4 Keypad with Arduino

In this post we are going to learn how to interface a 4x4 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.