Temperature Controlled Fan Featured Image

Temperature Controlled Fan

Here is another fan controller design based on PIC microcontroller, this time it's temperature controlled and can be used to monitor Hard Drive temperature and adjust the fan speed accordingly or as a case fan controller. This post following recently ...
Arduino-Thermometer-LM35-Featured-Image

Arduino Thermometer LM35

LM35 is a temperature sensor that outputs a voltage proportional to the surrounding temperature in centigrade. In this post I’ll show how this device can be connected to Arduino MEGA board to build a thermometer that shows the current temperature ...
LED Aquarium Lighting Featured Image

LED Aquarium Lighting

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 ...
Simple Digital Voltmeter Featured Image

Simple Digital Voltmeter

Simple digital voltmeter can be built by using PIC microcontroller and a few discrete components. PIC16F877A 10 bit ADC module was used for this purpose, we’ll work only with 8 upper bits to translate input voltage to digital form and ...
INA219-current-sensor-with-Arduino-Featured-Image

INA219 current sensor with Arduino

Measuring current is a relatively simple task that can be done by connecting a shunt resistor in series with the load and measuring the voltage on this resistor. The voltage is proportional to a load current according to Ohm’s law ...
High Power LED Controller Featured Image

High Power LED Controller

This post is about building a simple LED controller circuit. Several articles were published on this subject. Here is just one link to similar design that can be useful. Search the site for more information. Current design  relies on well-known technique to ...
Digital Timer Featured Image

Digital Timer

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 ...
Digital Voltmeter LED Display Featured Image

Digital Voltmeter LED Display

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 ...
10 Bit 7-Segment Digital Voltmeter Featured Image

10Bit 7-Segment Digital Voltmeter 0-24V

This is an upgrade to recently published Simple Digital Voltmeter.Few improvements were done to hardware and software.DVM operating range  was slightly increased up to 24 V Max, however the most significant change is that the code now uses full 10 bit of ...
Controlling PWM Fan with PIC16F684 Featured Image

Controlling PWM Fan with PIC16F684

In this post I’d like to share a design of PWM Fan controller based on PIC16F684 MCU. For Arduino version click here. Previously I’ve designed similar circuits some of them more complex than this one. I recommend you to look ...