In this post I’ll show how to build a basic kinetic watch winder using PIC microcontroller and stepper motor. Kinetic watches do not require changing the battery as frequently as in quartz watch however despite their many advantages they have a weak spot. If you don’t wear the watch for a few days it will discharge … Read more
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 control output voltage by changing its duty cycle. Pulse Width Modulation is a common way … Read more
This article shows how to create a fading/dimming effect of the LED using PIC micro-controller. For similar design based on Arduino click this link.Controlling LED brightness using PWM is a relatively simple task and can be accomplished by configuring PIC16F877 CCP module to generate varying PWM output by slowly changing its duty cycle setting from … Read more
If you ever thought how fast you can react to external stimulus here is the circuit that can measure your response time. It measures the time it takes for you to press the push button in response to turning the LED ON. The average human response time is about 300 ms. The principle of operation … Read more
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 this site under Projects –> Digital Voltmeter. For Arduino based LCD voltmeter click here. Present … Read more