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ChE 117

ChE 117. Motivation Lots of Tools Excel • Mathematica MathCAD • Calculators Matlab • Polymath Can’t always use “Canned Programs” i.e. binary phase equilibria Data manipulation Process control and data acquisition Excel macro language (VBA) Web pages.

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ChE 117

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  1. ChE 117 Motivation Lots of Tools Excel •Mathematica MathCAD • Calculators Matlab • Polymath Can’t always use “Canned Programs” i.e. binary phase equilibria Data manipulation Process control and data acquisition Excel macro language (VBA) Web pages

  2. Programming language: Visual Basic • Interface with Excel (VBA) • Similar to Fortran, C, C++, etc • PC-based DAQ (data acquisition) and control • High-level language (vs assembly) • What is: Visual Basic .NET • Computer interface • List of instructions • Contains Interpreter VB  machine language “on the fly”

  3.  Input Manipulate Output • What is a Program? • Road map • Set of instructions • Good for repetition • Example: convert °F to °C or °C to °F • GUI • ID Parts!

  4. Example Program (manipulation) • Average 3 numbers (10, 12, 15) • Sub Avg() • n1 = 10 • n2 = 12 • n3 = 15 • avge = (n1 + n2 + n3) / 3 • MsgBox avge • End Sub

  5. Decisions (“If” statements) • Sub test2() • label = "F" • TF = 212 • If label = "F" Then • TC = (TF + 460) / 1.8 - 273 • MsgBox TC • End If • End Sub • “If – Then – Else - Endif • Sub test3() • label = "C" • Tin = 100 • If label = "F" Then • Tout = (Tin + 460) / 1.8 - 273 • Else • Tout = (Tin + 273) * 1.8 - 460 • End If • MsgBox Tout • End Sub

  6. Loops (“If” statements) • Add numbers 1 - 10 • Sub looper1() • sum = 1 • n = 1 • 10 If n < 10 Then • n = n + 1 • sum = sum + n • GoTo 10 • End If • MsgBox sum • End Sub • Loops (For – Next) • Sub looper2() • sum = 0 • For i = 1 To 10 • sum = sum + i • Next i • MsgBox sum • End Sub

  7. Worksheets Modules sub & function procedures Chart Sheets User Forms and objects (VBA code) Workbook VB Editor / Modules MS Excel & Visual Basic (VBA ~ VB.6) • Excel Environment

  8. Example Program (manipulation) • Set up macro to calculate an average… use example as template. • Run the macro • Set up Form Button to run macro

  9. Problem Solving Exercise (in groups) • Set up macro to convert 100 kg to lbs or lbs to kg • Display result in msgbox • Run the macro • Set up Form Button to run macro

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