Module 2 – Digital I/O Output: Use the digital port to provide signals to display a number on a seven segment light emitting display (LED) display by wiring up the breadboard to connect it to the 8 port0 digital lines. Test this interface with a VI that lets you enter a number on the front panel and then displays the number on the seven- segment LED. The VI should turn the LED’s off when it quits. Input: Use the same portm in input mode, to read a binary pattern created by setting the switches on a dual in-line package (DIP) switch module, and mount the device on the breadboard and connect it to the same 8 digital lines.. Test this interface with another (or part of the previous) VI. Physics 4341

2 Notes on Module 2 Two VI’s, due next week. –(Note that you can combine them into one, using a listbox or ring ) –TTL output logic levels: 4.35 V on. –Input: open means off, closed (connected to 5 V) on. Use  current-limiting resistors. Note that same 8 lines are output (part I) and input (part II). –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 4343 Seven segment wiring (common cathode) A14 B13 C8 D7 E6 F1 G2 dp9 Cath4,12 DIPs (Dual-Inline-Packages) have an orientation notch in one end. If the chip is held so that the long axis is horizontal and the notch is at the left end, pin #1 is the leftmost pin in the bottom row. Pins are numbered counter-clockwise from there, i.e. left to right across the bottom row, then right to left across the top row. This allows automated chip-insertion machinery to ensure correct orientation of the chip by mechanical sensing. The picture is for a 8-pin DIP. In this case the “notch” is the top.

Wiring of the CAT5 pairs and 7-seg. Physics 4344 DataColorDAQhea der 7-seg pin 7-seg name P0.0brown65114A P0.1“/white66213B P0.2orange6738C P0.3“/white6847D P0.4green6956E P0.5“/white7061F P0.6blue7172G P0.7“/white7289dec.pt Gnd4 or 12Cath.

Physics 4345 Notes on mapping 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.Demo VI