The lightbulb is turned on and off employing a digital output from the Arduino board via a solid-state relay. Power and ground for the TMP36 are suppliedįrom the Arduino board and the signal, which is a voltage that is linearly proportional to temperature, is read on one of The pins are pointed downward and the flat side of the sensor is facing you, then the leftmost pin is the power (must be betweenĢ.7 V and 5.5 V), the middle pin is the signal, and the rightmost pin is ground. Specifically, if the sensor is oriented such that The TMP36 is connected to the Arduino Board as shown below. The temperature sensor can be attached to the surface of the lightbulb employing thermally conductive epoxy, or with adhesive The datasheet for this sensorĬan be found here. This sensor is also commonly included in many Arduino starter kits that are in the market place. In Celsius, is quite inexpensive (a couple of dollars), has adequate range, reasonable accuracy, and doesn't need to be calibrated. You can also employ other types of bulbs (LED, CFL, etc.).įor our temperature sensor, we will employ the TMP36 (though many others can be employed). We have chosen a 25 W bulb in order to keep the maximum temperature within the limits of the temperature sensor In this experiment our plant is a standard incandescent lightbulb where we will (ultimately) attempt to control the lightbulb's After we have generated such a model, we will attempt to explain what we have observedīased on our understanding of the underlying physics. This is sometimes referred to asĪ blackbox model or a data-driven model. Generate a model for the thermal behavior of the lightbulb based on its observed response. We, however, would like to be able to explain the resulting behavior of ourĬontrol system (and perhaps even attempt to design the control algorithm in a more intelligent manner). Off when the temperature is higher than desired. Simply employ logic that turns the lightbulb on when the measured temperature is lower than desired and turns the lightbulb In order to implement our temperature control system, we technically don't need a model of our plant (the lightbulb). To Proportional (P) control, Proportional-Integral (PI) control, and first-order systems. The chatter, through the use of deadbands, low-pass filters, and Pulse-Width Modulation. In this experiment, we observe the resulting "chattering"īehavior of the lightbulb and investigate alternative methodologies for reducing the frequency of this chatter, or smoothing To the AC source or it is not its intensity cannot be modulated. The lightbulb is a binary system with only two states, on or off. Is increased by turning the lightbulb on and the lightbulb's temperature is decreased by turning the lightbulb off (up toĮnvironmental limits). The purpose of this activity with the lightbulb is to demonstrate how to control switched systems. The lightbulb's temperature and the control signal. The control logicĮmployed for determining when to switch the relay on and off is implemented within Simulink, which is also employed for visualizing That is, the digital output alternately connects and disconnects the lightīulb from the AC power source (from the wall) via the relay in order to turn the light bulb on and off. The Arduino board is also used for generating the Digital Output that switches the solid-state relay on and off. The Arduino board provides power to the sensor and reads the sensor output via an Analog Input. The temperature of the lightbulb is measured in this example with a TMP36 sensor (cheap, relatively accurate, sufficient range). AC solid-state relay (hockey-puck type, etc.).lightbulb (incandescent, LED, CFL, etc.).
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |