Hello friends, I hope you are doing well. In the previous tutorial, we studied the working principle of a relay . Today, we will connect a 12 V relay to a PIC18F4550 microcontroller through a ULN2003A driver. A relay coil needs more voltage and current than a microcontroller pin should provide. It is also an inductive load, so it produces a voltage transient when switched off. The ULN2003A solves these interface problems by providing seven low-side Darlington drivers and seven internal clamp diodes in one package. The key point is that the ULN2003A does not convert a 5 V logic signal into a 12 V output. The 12 V energy comes from a separate 12 V supply. A logic high merely turns on one internal driver, which connects the low side of the relay coil to ground. We will examine that current pa ...
Hello friends I hope you all are doing great. Today, I am going to give you a detailed Introduction to PIC18F4550 . Its one of the most renowned PIC Microcontroller and is used in almost every field. You should also have a look at my previous tutorial Introduction to PIC16F877a , as it will also be helpful. PIC18F4550 also has 40 Pins and is quite similar to PIC16F877a with some additional features. In today's post we will get the general overview of this microcontroller, which is very essential if you wanna start working on it. If you have any problem in any part of it then ask your questions in comments and I will try my best to resolve them out. So, now let's get started with Introduction to PIC18F4550: Introduction to PIC18F4550 PIC18F4550 is a 8-bit and 40-Pin PIC Microcontroller whic ...
