Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Advanced Design Applications UNIT 4: MANUFACTURING Learning Cycle Six – It’s NOT a Relay Race © 2015 International Technology and Engineering Educators Association Objectives After completing this learning cycle, you will be able to: Understand how relays work. Create a working relay. Construct a circuit using a commercial relay. © 2015 International Technology and Engineering Educators Association Electromagnetic Relays Used to switch things on and off Available in a number of configurations Control a wide variety of devices http://laptopclipart.com/computer-clip-art-2/ http://www.sx1000.biz/washing-machine-clipart-7/ Computers Washing Machines Refrigerators http://www.sx1000.biz/refrigerator-clipart-4/ www.clipartbest.com © 2015 International Technology and Engineering Educators Association Relays A small machine Armature Electromagnetic coil Switch Spring Small amount of power to move armature to switch to a much larger amount of power © 2015 International Technology and Engineering Educators Association Relays All contain an electric coil powered by AC or DC Generates magnetic force when energized Magnetic force actuates or triggers switch Relays action from one circuit to another by activating load circuit • Circuits don’t touch • Load circuit operates the device • • • • © 2015 International Technology and Engineering Educators Association Sensors Information gathering technology Heat sensors in ovens Motion detectors in security systems Thermostat controls in air conditioning Float sensor on an automatic ice machine © 2015 International Technology and Engineering Educators Association Exploration Normally-closed sensors Closed when not activated (turned on) Open when activated (turned off) Normally-open sensors Open when not activated (turned off) Closed when activated (turned on) Depending on the type of device or sensor, the program may cause the opposite output than expected. © 2015 International Technology and Engineering Educators Association Piezo Vibration Sensor A piezoelectric sensor is a device that uses the piezoelectric effect, to measure changes in pressure, acceleration, strain or force by converting them to an electrical charge. http://oomlout.com/parts/VIBS-01-datasheet.pdf © 2015 International Technology and Engineering Educators Association Photo Resistor A photoresistor or light-dependent resistor (LDR) or photocell is a lightcontrolled variable resistor. The resistance of a photoresistor decreases with increasing incident light intensity; in other words, it © 2015 International Technology and Engineering Educators Association http://en.wikipedia.org/wiki/Photo_resistor#mediaviewer/File:LDR.jpg Temperature Sensor These sensors use a solid-state technique to determine the temperature. They use the fact as temperature increases, the voltage across a diode increases at a known rate. © 2015 International Technology and Engineering Educators Association http://www.tandyonline.co.uk/media/catalog/product/cache/1/image/9df78ea b33525d08d6e5fb8d27136e95/t/m/tmp36_1.png Boolean Logic The AND Function Requires both sensors to be either activated or closed for output to be activated. © 2015 International Technology and Engineering Educators Association Boolean Logic The OR Function Requires only one sensor to be activated or closed for the output to be activated. © 2015 International Technology and Engineering Educators Association