Electronics Online

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.

The description of a system based on a passive infrared motion detector (PIR) type BS1600 or BS1700, which can be used for security or corridor lighting in a power saving mode. Transformerless power supply generates a constant voltage of 12 V supply voltage 230 V/50 Hz power supply to the motion sensor and the relay coil (Fig. 1).

Figure 1

The scheme works very simply. When you turn on the device after assembly of all components, including a fluorescent lamp, the lamp will be lit for 10 seconds, stops for 30 seconds, turn on again for 10 seconds, and finally shut down. Now the scheme is ready to work.

Scheme for the laser scanner in the laser technique commonly used laser – scanners, galvanometers with a magneto system abnormalities, its anchor – is a permanent magnet with a mirror on which the laser beam is directed, and the excitation signal is fed to the solenoid, located on the stator. In general – it’s deflection system for the laser beam depending on the level of the input signal. Anchoring these galvanometers mounted sensor for determining the angle of rotation, then its transition from one level to another can be monitored by measuring the output from the sensor. For an ideal system inertialess input change is repeated without delay at the output of an appropriate scale. In reality, the system has a lag and a new position, it is set with a delay and with the vibrations near the new value – is a dynamic process with the transition characteristics. Fig. 1 shows the transient response galvanometer – a reaction to the action of a single pulse. To improve the dynamic characteristics of the instrument used schemes with differentiating and integrating the correction link (Figure 2, Figure 3).