Lab Proposal Prepared by: Anam

Lab Proposal Prepared by: Anam
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  Lab Proposal Prepared by: Anam, Yufei, and Jonathan  Abstract Like all transistors, phototransistors are also light sensitive. A phototransistor is a bipolar transistor in a transparent case so that light can easily reach the base collector junction. The photons in the base collector junction generate electrons that are inserted into the base of the transistor. The current gain in the transistor amplifies the current that forms inside. Similar to photodiodes, a phototransistor is light responsive, however the current gain in a photodiode is significantly lower since a photodiode allows much less current to flow through. For this particular project, the phototransistor will be used in a circuit to detect the current ambient light level (how bright/light it is). Once the level of light is indicated, it can determine how much current can pass through the circuit. Using computer programming, the led light can be adjusted to either be brighter or darker depending on how much light is needed. The transistor will act on the computer command by allowing more or less current through the circuit. Description of Project and Functionality We are intending to build an automatic light adjustment system. The basic function of the project is to control the brightness of an led light with respect to its surroundings. The system will detect the brightness of the environment where the system is located, and automatically adjust the brightness to a setting point by make the lights brighter or dimmer. In order to build this system, we will use a computer to carry the programming using Visual Basics, an ADC, and a DAC. A phototransistor will be used for light sensing and LED lights to adjust the brightness. The computer itself will be an HMI in this SCADA system as it is the user interface and master controller of the entire system. The sensor will input information about the ambient light level, and the computer program will output the value of the current needed to make the led brighter or dimmer. The output value will determine how much  current will be allowed to pass through the transistor to adjust the led light in the circuit. Schematic of Hardware Components   Project Time Line Week 1 : Light sensing and programming of signal reading. Week 2 : Programming of signal producing and different levels of brightness (multiple lights or fast flashing or both). Week 3 : Combine the previous parts together and program the automatically adjustment function. At this point the final report should be started.    Week 4 : If necessary, finish up what is left. The final report should be completed and ready to hand in.
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