In this post I'll show a more general approach for circuits prototyping. Instead of building each individual design to validate its operation why not to design a basic PIC16F877A based Development Board. Current design have all the necessary features of ...

This post is about building a basic distance meter with ultrasonic HC-SR04 sensor and PIC micro controller. For Arduino version click here. Raspberry Pi variant is also available at this link The interface is very simple and does not require too many commands ...

Here is another modification of a digital voltmeter. This time with 7 – Segment LED Display. These circuits seems to be more popular than other designs so I’ve decided to  publish another variant. You can find 4 variations of digital voltmeter on ...

Solar power mobile charger can be built by tweaking digital power supply schematic. The Software/Hardware stayed almost the same as the original circuit.Current design has the same overcurrent protection and output voltage can be changed by pressing SW1. Voltage and Current ...

This post is about building a simple PIC16F88 based DC motor controller. Motor speed and direction can be controlled by two push buttons SW1, SW2. One for motor speed and the other for polarity. This post follows recently published projects like PWM ...

Recently I was asked to build an aquarium lighting controller prototype to provide variable brightness during its operation and ability to program  ON/OFF times. 25 blue and white diffused 10mm LED were used to illuminate the aquarium. The main requirement from ...

Recently I’ve published a basic Binary to Hexadecimal converter design based on Atmega 2560 chip. The same set up can be used for building a simple UP/Down counter with Arduino Mega compatible board. 7-Segment display and its I/O stayed the same ...

LM75A is a digital temperature sensor with built in analog to digital converter and I2C interface .It can provide an accurate temperature reading from -55 to +125 C. For similar design based on analog LM35 sensor click here. Also a ...

In this post I’ll show you how to build a RFID reader for security access based on Arduino MEGA board. The code I've used is a modified version of a design that was published at Arduino project hub. I added ...

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 ...