Electronics

Designing a LED matrix

The objective of this post is to explain how to create a simple LED Matrix using PNP transistors and a ULN2803A integrated circuit, and assuming that only one LED needs to be connected at each time.

ESP8266: Connection to DS3231 RTC

The objective of this post is to explain how to connect the ESP8266 to a DS3231 Real Time Clock. It also explains how to create a simple program to configure the time and date of the RTC and to measure it periodically.