Simple IR Proximity Sensor Featured Image

Simple IR Proximity Sensor

This post is about building a Simple IR Proximity Sensor based on PIC16F877a micro controller. Usually these simple circuits are built using discrete components and include an OP AMP for comparing the photo diode voltage to a preset value. Current ...
PC Fan Controller Image

2 Channel PC Fan Controller

Following recently published article about building a PWM Fan Controller here is another simple controller design. This time it’s a 2 Channel PC Fan Controller for standard 12V Fans. It uses software implementation of PWM but instead of directly driving PWM ...
Interfacing-MAX7219-with-PIC16F876-microcontroller-Featured-Image

Interfacing MAX7219 with PIC16F876 microcontroller

MAX7219 is a common cathode display driver with a simple serial interfaces that can be easily connected to a microcontroller. Among other useful features this IC has built in brightness control and scan control capability that allows to limit the ...
Fading-LED-with-PCF8591-Arduino-I2C-Featured-Image

Fading LED with PCF8591 Arduino I2C

Controlling LED brightness with Arduino is one of the basic circuits you can built. Fade sketch is even included in the basic examples in the Arduino IDE. However on Arduino boards it’s done by pulse width modulation, changing the duty ...
Running LED with PIC16F877A Featured Image

Running LED with PIC16F877A

In this post I'll show a simple running LED circuit. Currently only 2 patterns are available but additional effects can be easily added by slightly modifying the code. This design uses only 16 LED's however PIC16F877 has 5 I/O ports ...
RTC Real Time Clock PCF8573P Featured Image

PCF8573P I2C Real Time Clock

In this post I’m going to show you how to interface an I2C Real Time Clock – RTC with PIC microcontroller. Only a basic hardware configuration and a communication protocol are presented here. I’m planning to extend it to a ...
3 Digit Dot Matrix Display SPI

3 Digit Dot Matrix Display SPI

3 Digit Dot Matrix Display with SPI interface is an advanced version of recently published 7x5 Dot Matrix Character Generator project. This design is more complex as it contains 4 microcontrollers. Three PIC16F88 were used to control 7x5 Dot Matrix Displays, ...
Arduino-LCD-Bargraph-Voltmeter-Featured-Image

Arduino LCD Bargraph Voltmeter

Arduino based LCD Bargraph Voltmeter can be easily assembled with Arduino Mega 2560/Arduino Uno or compatible boards. Arduino LED battery level indicator is here. Similar design based on Raspberry Pi platform is available at this link. This design is basically ...
128x64 LCD Display Featured Image

128×64 LCD Display

A few weeks ago I’ve uploaded post with relatively simple assembly code example for interfacing 2x16 LCD display with PIC16F microcontrollers. Driving Graphic LCD display is more complex task  as it lacks the build in character generation unit so each pixel needs to ...
7x5 Dot Matrix Character Generator Featured Image

7×5 Dot Matrix Character Generator

In this post a basic character generator design based on PIC16F88 will be demonstrated. 7x5 Dot Matrix Display was used and its pin out is shown in the schematic below. Instead of using PIC16F876/7 microcontrollers PIC16F88 was chosen for this purpose ...