In this tutorial we will assemble an entertaining and simple keyboard lighting effects. The device is designed to display animated graphics 12-LED on a single 7×7-sized field. Animated images are stored in the microcontroller and the touch of a button switch reduction.The type and amount of lighting effects are determined by the microcontroller firmware and the basic version are 12 options.
Archives for the ‘Fun circuits’ Category
Synthesizer lighting effects.
Simple lie detector
This simple lie detector circuit implementing human skin conductivity which varies according to the condition of the emotions. You can easily created with just a few minutes and cheap.
This is how simple lie detector work : The circuit uses an oscillator that has a frequency based on C1, R2, and skin resistance at the touch pad. Because C1 and R2 value is fixed, only the skin resistance at the touch pad that can change the tone oscillator. To maintain oscillation, the C1 provides some output from Q2 back to the input of Q1 through R1.
Running LED’s circuit II
This is another Running LED circuit from Radio Electronics. The circuit is very simple consists of three main components, Timer 555, 7493 Binary Counter, 4 line to 16 line decoder 74 154.
How do this Running LED circuit work : 555 timer generates a rapid circuit pulses when the switch S1 is open. Pulses are counted in groups of 16 and converted into a binary code by 7493 which is then given to 74154 (decoder 1 to 16).
