Avoid pointing the green laser pointer to the mirror

The photodiode through the optical properties of the light intensity change into a voltage signal, the signal source to reduce the load, so that no distortion to the signal acquisition input single-chip, using the TLV2463 operational amplifier follows the input signal, the signal to follow through after the chip timing control logic of an accurate stepper motor rotation makes the head rotation angle position accurately controlled, more convenient software reset, the motor feedback control point of deviation, the formation of closed-loop control by experimental research, can accurately track the specific location of the light source, when the track to light the specific location, the laser pointer light.Avoid pointing the    green laser pointer   to the mirror. As part of the motor drive and control parts independent of each other, the use of relay isolation. 3.1 photodiode light detection part of the use of white light-sensitive response characteristics, the detection of light sources can be done to detect the output signal following a, b are two options available to consider the program a program shown in Figure 3.1 b 5 Figure Figure 3.1 shows the program uses a voltage comparator method, the acquired voltage signal compared with the reference voltage to generate high-low pulse to get through the level of change detection signal, the reference voltage control instability, and the resulting negative level may burn microcontroller, as shown in Figure b the use of a voltage follower, the signal input to the chip without distortion processing, measured by a comprehensive comparison, we use the program shown in Figure 2 for signal detection.Avoid pointing the    100mW green laser pointer    to other objects with high reflex. 3.2 Signal processing part of the detection signal into the microcontroller I / O port, through the A / D conversion, into a digital pulse signal when the light intensity from the reference point, the program through the acquisition of adjacent light intensity, light intensity compared with the baseline control motor turn, accurately track the specific location of the light source, the initial time set the reference voltage signal, or pre-scan the entire light area, to determine the point of maximum light intensity of the signal voltage corresponding to the reference voltage, when the light source moves, the photodiode receives light intensity decreases, then the microcontroller to control the motor to the surrounding space looking for light, when to find the location of the maximum light intensity when the motor stops moving, and laser pointer to be lit, 3.3 motor drive control part of the head through the drive motor rotation direction, respectively, up, down, left, right, the four directions of the relay control, the horizontal direction, when the light intensity changes, the software system default motor to the left turn, if the left light weakened, then turned to the right, to detect the point of maximum light intensity, then to the right to find   50mW blue violet laser pointer, if the light intensity decreases, then return to point of maximum light intensity. Avoid pointing the    200mW green Laser Pointer    to other objects with reflective surface.Motor control part of the diagram in Appendix 4, the software system design through the 430 microcontroller programming, the use of the A / D module to complete the acquisition by an external pulse counting circuit, the motor rotation direction for software control, is mainly to highlight the programming software The purpose of the control hardware, as shown in Figure 4.1 6 7 5 Figure 4.1, point source design, measurement and display the current part of this module is provided with TI INA270 chip by adjusting the potentiometer to change the LED brightness at the same time.
related green laser pointer blog:
laser pointer pen