CPS-Lab* / Mbed 2 deprecated Lab2

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Dependencies:   mbed

Lab2_Report.txt@1:71590a7cd53f, 2018-01-25 (annotated)

Committer:
jackclar
Date:
Thu Jan 25 15:37:45 2018 +0000
Revision:
1:71590a7cd53f
Parent:
0:815bb05cffef
Child:
2:48a9b9c9bda8
revision 1;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
jackclar 1:71590a7cd53f 1 Results:
jackclar 1:71590a7cd53f 2 We successfully created a program to output a variable voltage from the mbed board. We then used that voltage to power two series of resistor networks. These are our ideal calculations and our actual readings.
jackclar 1:71590a7cd53f 3
jackclar 0:815bb05cffef 4 Circuit 1)
jackclar 0:815bb05cffef 5 Ideal)
jackclar 0:815bb05cffef 6 V1 = 2.5V
jackclar 0:815bb05cffef 7 V2 = 1.72
jackclar 0:815bb05cffef 8 R1 = 1k Ohm
jackclar 0:815bb05cffef 9 R2 = 2.2k Ohm
jackclar 0:815bb05cffef 10 I1 = .781 mA = I2
jackclar 0:815bb05cffef 11
jackclar 0:815bb05cffef 12 Actual)
jackclar 0:815bb05cffef 13 V1 = 2.52V
jackclar 0:815bb05cffef 14 V2 = 1.74V
jackclar 0:815bb05cffef 15 R1 = 0.998k Ohm
jackclar 0:815bb05cffef 16 R2 = 2.19k Ohm
jackclar 0:815bb05cffef 17 I1 = 0.8 mA = I2
jackclar 0:815bb05cffef 18
jackclar 0:815bb05cffef 19 Circuit 2)
jackclar 0:815bb05cffef 20 Ideal)
jackclar 0:815bb05cffef 21 V1 = 2.1V
jackclar 0:815bb05cffef 22 V2 = 1.35V
jackclar 0:815bb05cffef 23 V3 = 0.047V
jackclar 0:815bb05cffef 24 I1 = 0.746 mA
jackclar 0:815bb05cffef 25 I2 = 0.615 mA
jackclar 0:815bb05cffef 26 I3 = 0.13 mA
jackclar 0:815bb05cffef 27 I4 = 0.099 mA
jackclar 0:815bb05cffef 28 I5 = 0.31 mA
jackclar 0:815bb05cffef 29 R1 = 1k Ohm
jackclar 0:815bb05cffef 30 R2 = 2.2k Ohm
jackclar 0:815bb05cffef 31 R3 = 10k Ohm
jackclar 0:815bb05cffef 32 R4 = 470 Ohm
jackclar 0:815bb05cffef 33 R5 = 1.5k Ohm
jackclar 0:815bb05cffef 34
jackclar 0:815bb05cffef 35 Actual)
jackclar 0:815bb05cffef 36 V1 = 2.128V
jackclar 0:815bb05cffef 37 V2 = 1.363V
jackclar 0:815bb05cffef 38 V3 = 0.047V
jackclar 0:815bb05cffef 39 I1 = 0.77 mA
jackclar 0:815bb05cffef 40 I2 = 0.64 mA
jackclar 0:815bb05cffef 41 I3 = 0.15 mA
jackclar 0:815bb05cffef 42 I4 = 0.12 mA
jackclar 0:815bb05cffef 43 I5 = 0.05 mA
jackclar 0:815bb05cffef 44 R1 = 0.993k Ohm
jackclar 0:815bb05cffef 45 R2 = 2.176k Ohm
jackclar 0:815bb05cffef 46 R3 = 9.54k Ohm
jackclar 0:815bb05cffef 47 R4 = 467 Ohm
jackclar 0:815bb05cffef 48 R5 = 1.482k Ohm
jackclar 0:815bb05cffef 49
jackclar 0:815bb05cffef 50 Difficulties:
jackclar 0:815bb05cffef 51 The most difficult part of this lab was setting up the variable voltage source. We ran into several problems, namely manipulating the input voltage into a 12 bit number that could be output.
jackclar 0:815bb05cffef 52 We rearranged the given formula and accounted for outputting a 16 bit number as a 12 bit number. We also had to make sure that the types were correct when manipulating the voltage and doing
jackclar 0:815bb05cffef 53 calculations.
jackclar 0:815bb05cffef 54
jackclar 0:815bb05cffef 55 Analysis:
jackclar 0:815bb05cffef 56 Resistors)
jackclar 0:815bb05cffef 57 Our resistors were all very close to their ideal values. They weren't perfect because they are physical systems and have a built in error of around 1% due to
jackclar 0:815bb05cffef 58 manufacturing defects and temperature variations. They all seemed to be operating within that range.
jackclar 0:815bb05cffef 59
jackclar 0:815bb05cffef 60 Voltage)
jackclar 0:815bb05cffef 61 The main error for measuring voltage came from our output being a quantized version of an analog output. It can never be perfect. If we get a reading that is on the edge of
jackclar 0:815bb05cffef 62 a voltage cutoff, it will be slightly off. That being said, all of our measurments were very close.
jackclar 0:815bb05cffef 63
jackclar 0:815bb05cffef 64 Current)
jackclar 0:815bb05cffef 65 Current was where we had our largest variations, this was moslty due to our multimeter having a 0.02 mA variance. Even when disconnected the multimeter read 0.02 mA. The other variances
jackclar 0:815bb05cffef 66 were from differences in resistor values and voltage, which impact the current.