lab5_TimingCkts_EEC10_W16 - Introduction to Digital and...

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Version 1.1 Introduction to Digital and Analog Systems January 28 Lab #5: Timing Circuits In this lab, you will create a timing circuit using digital integrated circuits and use it to make an LED flash in a specific set of patterns. In this case you’ll be designing a circuit to generate a SOS like pattern with LEDs. Scott T. Block, Chen-Nee Chuah, and Rajeevan Amirtharajah
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Introduction to Digital and Analog Systems Parts Required NOTE: VCC = 5 VOLTS FOR ALL PARTS OF THIS LAB, i.e. used the digital voltage supply. Note: It would be wise to add a 0.1μF bypass capacitor per 74## and 555/556 timer chips you have on your breadboard. You should connect the 0.1μF cap from VCC to GND. The closer to each chip you have the better. There are lots of them in the lab. As shown in this link, they place the cap directly over the IC [ link ]. Also remember every IC (integrated circuit) has a VCC and GND, so wire VCC to the 5 volt digital supply and remember to hook up GND to DGND/AGND for each of them ( these are actually shorted internally to each other ), both located on your myDAQ. Also note that not all the R, and C values have been listed as that will be up to you to find for the given parts of the lab, but these are the specific parts you’ll need: You will need the following parts for part 1 3x 0.1 μF 1x SN7400 4x NAND 1x SN7402 4x NOR 1x SN7404 6x Inverter You will need the following parts for part 2 3x 0.1 μF 4x LED 1x SN7404 6x Inverter 2x DM7474/SN7474 Dual Positive Edge Flip Flops You will need the following additional parts for part 4 3x 10 μF 1x LM555 Timer ( or LM556 which has two 555 timers in one package, see ref. 17 ) PART 1: Timing and Lighting Control Circuit (part 3 from prelab) Note: Remember to add a 0.1μF bypass capacitor per 74## chip you have on your breadboard. You should connect the 0.1μF cap from VCC to GND; see references at the end of the document for links to spec sheets for each part. The closer to each chip you have the better. There are lots of them in the lab. As shown in this link, they place the cap directly over the IC [ link ]. Figure 1: Time Control Logic Circuit
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Introduction to Digital and Analog Systems Build Figure 1 ( 0.1μF bypass capacitor not shown ). The pins on how to wire them up have not included. Look up each part to figure out how to wire it up. Uses your myDAQ Digital I/O (Input/Output) pins to make sure the pattern generated by your build circuit at the output Y0 is the same as the one you found in the prelab. Connect Q2 and Q3 to DIO pins 0 and 1 respectively; then connect Y0 to DIO pin 4. Use the Digital Write provided with your MyDAQ to control DIO pins 0 3 and Use the Digital Reader to read from DIO pins 4 7. Make sure pin 4 connected to Y0 only lights up when you expect it to. Don’t take apart this circuit as it a smaller part of the SOS circuit th at you’ll build at the end. The time control logic circuit effects the timing by moving part of the capacitance from GND to VDD causing a longer charging/discharging of this flying capacitor only for the letter “O” . Basically, the output Y0 is normally
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