Three Stages of development of green laser pointer Technology is as follows

Limiting reference voltage is 100mV, the selection of the sampling resistor depends on the limiting parameters of the brushless motor power is 6W voltage is 5V, Rs, ≈ 0.1 / Imax sampling resistor Rs, ≈ 0 09 Ω,. To avoid the change may be caused to the peak pulse current detection malfunction, sampling circuit has a low-pass filter circuit, the resistor 100. And capacitance of 0.1 of μ, the current detection signal after the filter to give as gifts MC33035 pin 9, to achieve the current PWM control functions, constitute the current P-closed-loop control. If there is a more complex control can be added to the external circuit, the current PI and PID control. What’s more, users have no need to align the emitter with the receiver of  green laser pointer  with remote control.
Speed control MC33039 is a Motorola tie MC33 03 designed brushless motor closed-loop speed controller, the system does not have to use the higher price of electromagnetic loop speed control IC designed to precise speed control can be achieved. Its three input monitoring of brushless DC motor position sensor output signal, the output pulse signal pulse width is determined by the 6-pin external resistors and capacitors, the output pulse signal after low-pass filter to produce a DC voltage proportional to motor speed . If the actual motor speed signal to the MC33 03 5 can constitute a speed closed-loop control. MC33039 output smoothed by the low-pass filter in the motor control system. Simple  green laser pointer  can be only used as a pointer.
The introduction of the MC33 03 of the error amplifier inverting input, while the speed of a given signal integral input MC33 03 5 of the error amplifier inverting input, which constitute the system's speed closed-loop control. According to the above discussion, the brushless DC motor drive control physical map shown in Figure 3-6. Shown in Figure 3-6 DC brushless motor drive control physical Figure 3.3 Summary using the MC33035 control of brushless DC motors and simple external circuit, control functions, the protection function, easy to debug, versatile design can easily good and low cost. In particular, the MC33035 also has a temperature range of industrial applications.  green laser pointer contains green ray pointers.
Especially suitable for the working environment, controller size and price performance ratio higher occasions. Chapter IV data acquisition and processing hardware and software design data acquisition and processing circuitry includes a logic control circuit, the FIFO circuit, the AVR interface circuit. Their relationship between the structure shown in Figure 4-1. The logic control circuit to capture the signal of each sensor, FIFO sent to the AVR, combined with software to achieve the identification of targets, three-dimensional coordinate calculation, and finally communicate with the computer, real-time display of actual measured values. Figure 4-1 data acquisition processing circuit 4.1 CPLD control circuit data acquisition and processing circuit is an important part of intelligent instrumentation and control devices. Three Stages of development of  green laser pointer  Technology is as follows.