ClassNotes4 (1)

# ClassNotes4 (1) - – You can set up your breadboard to do...

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Physics 434 1 Some lessons from Module 1. A control usually needs a default It is not the equivalent to a constant, unless you make “current value default” after setting it. How about the low-current limit? Didn’t those wiggles bother you when you were measuring small currents? The range counts! Default is 0 to +10, so 10V/4096=2.5 mV!

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Physics 434 2 Notes on Module 2 (thank you Prof. Toby Burnett) Two VI’s, due at the end of this week. (Note that you can combine them into one, using a listbox or ring ) TTL output logic levels: <0.4 V = “off”, > 4.35 V = “on”. TTL Input: open or > 4.35 V = “on”, closed (shorted to ground) = “off”. Don’t need all the different colors for the wires. (But distinguish ground). Use ~300 current-limiting resistors for each display bar. Note that same 8 lines DIO lines are output (part I) and input (part II).

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Unformatted text preview: – You can set up your breadboard to do both • You have to deal with binary numbers (table II is a worksheet) – Note the Format & Precision menu item for a numeric constant, which can be used to set binary (or octal or hexadecimal). • Note the requirement: your VI should turn the LED’s off when it stops. (think about how to do it.) Physics 434 3 Recall the AT-E board Physics 434 4 Seven-segment-display wiring (common cathode type) A 14 B 13 C 8 D 7 E 6 F 1 G 2 dp 9 Cath 4,12 Physics 434 5 Notes on mapping number to bars • How do you convert the numbers 1-9 to a different sequence? In most languages, two choices: – case or if-elseif (adds code, complexity) – Table lookup (adds to memory) • How does this map into G? See the Demo VI ....
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ClassNotes4 (1) - – You can set up your breadboard to do...

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