
Description: Today’s Tutorial is about the ULN2003A, which is most commonly used in electronics circuits. One of its most common uses is that uln2003 is used as a relay driver. At the... Read more »

Description: My previous tutorial was based on how to monitor an analog sensor using only Nodemcu esp8266 wifi module and Blynk application. The disadvantage of using Nodemcu alone is that, you can... Read more »