Fan Speed Monitor is another simple design based on PIC16F876A microcontroller. Two similar posts about ways of controlling and monitoring fan speed were recently published. PWM Fan Controller and 2 Channel PC Fan Controller. Current article however implements a different ...

Light emitting diode (LED) Controller was built using PIC microcontroller and LM317 regulator. Comparing to traditional light sources led illumination should provide more efficient lighting also giving you a possibility to choose desired wavelength. 48 white diffused LEDs connected in parallel ...

A simple light sensor can be built using a photoresistor and Arduino UNO board. Similar design is available here. This design requires only a few additional components like 10k resistor and a 10k potentiometer to adjust the light intensity level ...

Adding a serial data transfer capability to a 7-Segment LED Display can be done by using PCF8574 I/O Port expander with I2C interface. Arduino UNO controls the PCF8574 by sending display codes for each segment. Similar circuit based on PIC16F876 ...

8x8 LED Matrix chaser based on Arduino MEGA compatible board will be presented in this post. It uses a LED dot matrix display module with two 74HC595 shift register chips connected in serial to control the LED output. Similar design ...

In this post I’ll show how a single alphanumeric display can be driven by PIC16f877A micro controller. There are dedicated IC’s for this purpose  however a micro-controller can be programmed to perform this task. By using a microcontroller you'll get a ...

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 ...

Digital Timer can be built by using PIC16F876A micro-controller and a few additional components. The schematic is similar to Fan Speed Monitor Design. 3x4 Keypad and 5V Relay were added as you can see from figure below. Only three 7-Segments ...

Interfacing Humidity and Temperature Sensor DHT11 with Arduino platform is the topic of this post. I’ve published a number of designs with various temperature sensor, both digital and analog. Here you can see how to use LM75A digital sensor with ...

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 ...