ࡱ> 685x5@ bjbj22 XXX`C vvvvvvv8$ 6r4W-W-W-5555555$6RK9j5W-*\W-W-W-5vv?5=0=0=0W-jvl5=0W-5=0=002h,43f a<|v-d3|3 50 6$39%.9 43"Df,vvvv943HW-W-=0W-W-W-W-W-55v0"vUsing System Modules Input Sensors Take the dark sensor board and use the multimeter to measure the resistance of the Light Dependent Resistor in the light and then in the dark. Dont connect the battery yet. Put the red meter probe on the contact on the right hand side of the board, and the black probe on the bottom contact. The meter should be on the 20k resistance range. Write the resistance in the light down here: Now switch the meter to its highest range, 2M or 20M, and measure the resistance of the LDR in the dark. Write the result here: .. Now add the 9v battery to the sensor board. Put the meter on the DC volts range (20v) and see how the output voltage changes when the LDR is in the light or in the dark. Write the two voltages down here: In the light In the dark  ( Now exchange the Dark Sensor for the Angle Sensor. Keep the meter on DC voltage and put the red probe on the top test point on the battery board and the black probe on the bottom test point. The meter should read roughly 9v. Write down the actual reading: Now move the red probe to the output test point of the angle sensor board. As you turn the knob on the potentiometer, the output voltage should change. Write down: the highest voltage and the lowest voltage Change the angle sensor for a top switch sensor. Before you measure it, try to predict the output voltage with the switch pressed and released. Now measure the output voltage with the meter. Were you correct? Prediction: Pressed Released Measured: Pressed Released All these inputs use a voltage divider circuit. Using System Modules Switching Process Input devices are not much use on their own. We can use transistors to switch outputs on or off automatically in response to those inputs. The transistor forms the process block in the system. Remember that most electronic systems consist of an input block, one or more process blocks and one or more output blocks. Connect the Angle Sensor to the battery block and attach the Transistor Switch on the right hand side. Add an LED output board. You should be able to turn the LED on and off using the angle sensor. Connect the red meter probe to the test point on the sensor board. Use the meter to measure the voltage at which the transistor switches on. What is it? Replace the angle sensor with the dark sensor board. Try and adjust the variable resistor so that the transistor will switch the LED on when you wave your hand over the LDR. Now replace the transistor switch with the Darlington Switch. This uses two transistors to make a better switch. Do you find it easier to adjust the circuit than the single transistor? What voltage makes the Darlington Pair switch the LED on?  Change the output block to 4 LEDs, flashing LED, buzzer, or any other output block that you have. You may find some output blocks dont seem to work properly; can you think why? Change the dark sensor to a light sensor, or one of the temperature sensors, or the moisture (wet/dry) sensors. Do all of them work properly? Remember the Input Process Output system diagram: EMBED MSDraw.1.01 The basic input block is a potential divider; the basic process block is an electronic switch; the basic output block is a sound or visual indicator. Classwork and Prep Name Write the name of the circuit symbol in the box next to it.   Use the correct circuit symbols to draw the circuit diagrams for the following system blocks. 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