RGB LEDs Colour Mixing Controller - Lab Report Example

RGB LEDs Colour Mixing Controller Synopsis of the experiment In the experiment, the controller will be designed to maintain LED colour points within a colour mixing strip. In order to achieve this, conditions of communication at each stage were set. Given that a one channel can only produce at most seven colours, output reduction will be employed so that additional colours could be generated. The design involved only three essential circuits which include, the primary colour LED driver circuit, switch control and sensor ones. The primary colour circuit referred to as the RGB LED driver circuit includes individual light emitting diodes that were used in the experiment. Given that this circuit combines three LEDs, it provides a gateway for one control such that achievement of the three individual colours could be made. The sensor circuits were used to measure the intensities of light produced from each diode. By amplifying negative output voltage, polarity of this circuit will be inverted by use of an inverting amplifier. Then this voltage is directed to RGB LED circuit above and in practicality, to the inputs of P1C1F872 terminals A/D. The last part of the circuit encompasses the switching control unit specifically made for purposes of switching the controller on and off and thus feeding with lighting instructions. Aims and objectives The major aim of designing a light emitting diode mixing controller is largely for managing and controlling light emitting diodes colour points. It is also responsible for maintaining the controlled light colours to produce desired lighting effects. Another aim is to reduce cases of failed colour lighting in producing the RGB effect. For these aims to be achieved, specific objectives are necessary. Firstly, identification of all required equipment such as LEDs and power sources with appropriate current feeding is made. Secondly, the main controller is broken down into stages such that each stage can produce an independent controller for the purposes of achieving desired lights at each stage. Lastly, every stage involved use of assurance techniques to ensure that required voltages were attained. Introduction Lighting systems have been identified as some of the most beautiful creations of electronic engineering. Achieving lighting effects depends on the equipment used, mostly, LEDs. Given that most lighting designs employ the single LED technology, RGB employees the use of three Light emitting diodes, each with a corresponding primary colour. Designing and implementing RGB LEDs controller is a complicated multistage process. Achieving accuracy has been identified as one of the greatest milestones in practical electronic engineering design (Box 2010). Given that such designs need multidimensional controlling, there is greater need for having more than one controller for the three LEDs in the circuit. Therefore in this RGB LEDs controller project, various stages were involved due to complexities of the whole process. While white emphasis has been laid in this experiment, combination of other colours is necessary to reduce monotony in lighting and thus add to an interest feature of the experiment. The colours preferred are not purely primary but intermediates of the primary colours and therefore the preference in choice of colours inclined towards red, blue and green (Smith, 2011). Under normal circumstances and chosen required voltage limits, the three light emitting diodes will be able to produce white light. For instance at RVL VR, VG and VB for Red, Green and Blue respectively, white colour will be visible. On reducing the amount of RVL for Blue to suiting level and maintaining the other colours, red light will be produced. On further addition of RVL for blue and reduction of red while green is maintained blue light will be visible. The working of any design marks a great step in implementation of any process. Therefore in order to implement this design, various actions will be followed for approval and consequently moving from one stage to another in the different light emitting diodes. Involving four small controllers for control of incoming lights to produce the desired light, sequential actions will be followed through each controller (Box 2010). The first step involves starting the control and then a running a scan to find an ON pressed button. If found then all diodes are supposed to light simultaneously. If not found then the first action above is made. Thirdly if the diodes light then determination should find that they are producing light-colour inclined towards white. When this is true, the controller should be restarted to return to initial position ready for producing another light of a different colour. If all the LEDs are not simultaneously on, then the voltage is scanned again to find out whether RVLs for Red is an appropriate value. If not then addition of current is made to each LED to increase these voltages. But if the voltages are correct, authentication of the first step is then completed (Schiller 2010). The second controller’s button is then pressed. After starting, all LEDs should then light and if not, an action should be routed to controller one above. If they light, the consequent stage should seek to determine if the LEDs are producing light coloured towards red. If so, then determination should be made whether controller2 button is pressed and if so, control button 4 should be pressed. If the light produced is not inclined towards red, then RVLs for each diode should be corrected to appropriate values. The third stage involves a signal from the above stage, which is from controller2 to find out if push button 3 is pressed. If not then action is redirected to controller3 and if not then the stage begins after the feed from control 2. If pressed, then all LEDs should light by producing colour inclined towards green. But if the colour produced is not green, then additional corrections are made to RVLs to appropriate values for all colours (Smith, 2011). Lastly, controller3 is fed into push button 4 and check whether the button is pressed. If not, then action is redirected to controller4 to end the light cycle, but if pressed, then all LEDs should light. If not, then the immediate above step is repeated but if they light, then blue light should be produced. If blue light fails to be produced then additive corrections are made for RVLs for red to appropriate values (Schiller 2010). Bibliography Box, H. (2010). Set Lighting Technicians Handbook: Film Lighting Equipment, Practice, and electrical distribution. Waltham, USA: Focal Press. Schiller, B. (2010). The Automated Lighting Programmers Handbook. Waltham, USA: Focal Press. Smith, T. (2011). Electronic Engineering: RGB design. New York, NY: Cengage Learning. Read More