What’s the normal preserving temperature of a green laser pointer?
Summary of the system introduced by TI's Cortex-M3 family LM3S811-based core, and the phototransistor (3DU5C) sensor LED light intensity of the program to achieve the point source tracking. Completed the basic part and the part played most of the demands, through this competition, let us recognize the LM3S811 Cortex-M3 family of powerful features, but also learned a lot, feeling a lot for the future to become a qualified hardware engineer lay a solid foundation.The laser indicator light of R400 green laser pointer has the same function as that of a common one. Finally, we thank the school for the training, the instructor's help, and TI provided the training opportunity.

Point source tracking system
 Abstract: source tracking technology is a practical technology has applications in many areas, especially in solar energy devices used to make work more efficient, higher energy absorption rate. This paper presents a realization of the light source based on ARM32 chip tracking method. The system ARM32 MCU core for control, through three photoresistance point source of light signals to optical signals through photoelectric conversion by A / D digital-analog conversion, and then process these signals through the ARM32 chip, to determine the location of point source in order to achieve two directions up and down the servo automatic tracking optical signal.When you press the laser beam button of green laser pointer, it would emit red 200mW green Laser Pointer. Point source is 1W LED lights, adjustable via potentiometer to achieve the required current value range. Resistance by three photosensitive optical signal acquisition, and according to some algorithm to find the source.
 First, the system design and demonstration of light-sensitive sensor selection options for a light sensor is a photoelectric sensor options will be measured by changes in optical signals into electrical signals change, with this function is called photosensitive materials, material, made of device, said photosensitive device. Many different types of photosensitive devices, such as: optical tubes, photodiodes, photomultiplier tubes, phototransistor, photoresistor, photovoltaic cells, optical coupler, fiber optic, and so on. In the computer, automatic detection and control system is widely used. 1.1 Summary of the photosensitive element option is to test the system's sensors are illuminance, many different types of photosensitive devices, we find the following program information, by contrast, we chose the best of several options for further testing of the actual components were screened to select the best of the application.On the green laser pointer there’s corresponding indicator light to warn users 100mW green laser pointer. The sensor can be considered as the following options: Option One: The photosensitive resistance Option Two: the use of photodiode Option Three: the use of the phototransistor Option 4: the use of infrared receiver program five: the use of photovoltaics program six: The camera program VII: linear CCD 3 program components in Table 1 Comparison of characteristics of light-sensitive light sensitivity of interference by external light from the photosensitive element nature of the test (test verification) Remarks purely resistive device, both ends of the photosensitive electrical resistance changes in light intensity with pressure resistance and detection range is limited on the outside light, the subject requires 2m distance sensor voltage signal is weak vulnerable to external light,
especially during the day affect the accuracy of ordinary visible light is not very high photodiode has its conduction diode characteristics and external conditions also relatively light on the test range far,
the outside light can be susceptible to dry up even more distant 2m to the useful signal interference can also capture high accuracy with very similar phototransistor and photodiode current amplification, high sensitivity and photodiode detection distance is relatively far less, can reach 2m or more distant signals can also be useful to collect the light 50mW blue violet laser pointer from outside interference.The red laser beam of green laser pointer is weak in scattering.
 related green laser pointer blog:

led flash light