Universitas Sumatera Utara

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2 Program pada Mikrokontroller $regfile = "m8535.dat" $crystal = $baud = 9600 Dim Ctr As Byte Dim Dataword As Word Dim Command As Byte Dim Dis As String * 20 Dim Calc As Single Dim Calc2 As Single Dim Rhlinear As Single Dim Rhlintemp As Single Dim Tempc As Single Dim Tempf As Single Deflcdchar 0, 14, 17, 17, 14, 32, 32, 32, 32 ' replace? with number (0-7) Dim Putrn As Integer Dim Hit As Integer 'Dim I As Integer Config Lcdpin = Pin, Db4 = Porta.2, Db5 = Porta.3, Db6 = Porta.4, Db7 = Porta.5, E = Porta.1, Rs = Porta.0 Config Lcd = 16 * 2 Config Timer0 = Counter, Edge = Rising Config Timer1 = Timer, Prescale = 1024 On Timer1 Label2 Const C1 = -4 SHT-11 ke nilai Const C2 = datasheet) Const C3 = Const T1c =.01 Const T2 = Const T1f =.018 'Konstanta untuk konversi data 'nyata sebenarnya (rumus menurut

3 Sck Alias Portc.1 Dataout Alias Portc.0 Datain Alias Pinc.0 Redled Alias Portc.2 Declare Sub Calc_crc(byval X As Byte) Declare Sub Getit() Ddrc = &B 'mengaktifkan internal pullup Config Pinc.0 = Output Config Pinc.1 = Output terlebih dahulu Set Dataout For Ctr = 1 To 12 Set Sck Waitus 2 Reset Sck Waitus 2 Next Ctr Enable Interrupts Enable Timer1 Start Timer1 Tcnt0 = 0 Hit = 0 'sck 'datain 'mereset komunikasi serial Do terus-menerus 'prosedur penampilan suhu dan temperatur Cls Putrn = Tcnt0 Command = &B Z1(1) = 3 Call Getit "dataword" for us Tempf = T1f * Dataword Tempf = Tempf - 40 Tempc = T1c * Dataword Tempc = Tempc - 40 Dis = Fusing(tempc, "###.##") 'Get the temperature, puts result in 'get celcius for later calculations and for "the rest of the world"

4 Print "Suhu = " ; Dis ; "C" Locate 1, 1 : Lcd "Suhu = " ; Dis ; " " ; Chr(0) ; "C" Wait 1 Command = &B Z1(1) = 5 Call Getit 'get the humidity Calc = C2 * Dataword Calc2 = Dataword * Dataword 'that "2" in the datasheet sure looked like a footnote for a couple days, nope it means "squared"! Calc2 = C3 * Calc2 Calc = Calc + C1 Rhlinear = Calc + Calc2 'Dis = Fusing(rhlinear, "##.##") 'Print "Humidity adjusted for linear = " ; Dis Calc = T2 * Dataword Calc = Calc + T1c Calc2 = Tempc - 25 Calc = Calc2 * Calc Rhlintemp = Calc + Rhlinear Dis = Fusing(rhlintemp, "##.##") Print "Humid:" ; Dis ; "%" Locate 2, 0 : Lcd "Hum = " ; Dis ; " %RH" Wait 1 Loop Label2: Cls Lcd "Kec Angin:" ; Putrn ; " ptr" Print "Kec Angin : " ; Putrn ; " ptr" Wait 1 Hit = Hit + 1 If Hit = 8 Then Tcnt0 = 0 Hit = 0 For I = 0 To 10 Cls Lcd "Kec Angin: " ; Putrn ; " rpm" Print "Kec Angin : " ; Putrn ; " rpm" Waitms 100 Next I

5 End If Start Timer1 Return Sub Getit() Local Datavalue As Word Local Databyte As Byte 'start with "transmission start" Set Sck Reset Dataout Reset Sck Set Sck Set Dataout Reset Sck 'now send the command Shiftout Dataout, Sck, Command, 1 Ddrd = &B now input Config Pinc.0 = Input Set Sck more off Reset Sck Waitus 10 without it! Bitwait Pinc.0, Reset data ready Shiftin Datain, Sck, Databyte, 1 the MSB Datavalue = Databyte Z1(2) = Databyte Ddrd = &B Config Pinc.0 = Output Reset Dataout Set Sck Reset Sck Ddrd = &B Config Pinc.0 = Input Shiftin Datain, Sck, Databyte, 1 LSB Z1(3) = Databyte Shift Datavalue, Left, 8 Datavalue = Datavalue Or Databyte 'datain is 'datain 'click one 'no idea why, but it doesn't work 'wait for the chip to have 'get 'this is the tricky part- Lot's of hair pulling- have to tick the ack! 'datain is now input tick the 'get the 'don't clock or ack

6 Dataword = Datavalue Ddrd = &B Config Pinc.0 = Output Reset Dataout Set Sck Reset Sck Ddrd = &B now input Config Pinc.0 = Input Shiftin Datain, Sck, Databyte, 1 Ddrd = &B Config Pinc.0 = Output Set Dataout Set Sck Reset Sck End since we don't need the CRC value, leave it hanging! 'datain is

7 PEROGRAM VISUAL BASIC UNTUK TAMPILAN PC Private Sub cmd_close_click() Unload Me Private Sub cmd_start_click() Timer2.Enabled = True Private Sub cmd_stop_click() Timer2.Enabled = False Private Sub Form_Load() Frame1.BackColor = &HFFFFFF Timer2.Enabled = False Timer1.Enabled = True MSComm1.PortOpen = True MSComm1.DTREnable = True MSComm1.RTSEnable = True Adodc1.Refresh Private Sub Label1_Change() If Label1.Caption <> "" Then Label2.Caption = Label1.Caption End If Private Sub Label2_Change() a = Left(Label2.Caption, 1) If a = "S" Then Label3.Caption = Label2.Caption End If If a = "H" Then Label4.Caption = Label2.Caption End If

8 If a = "K" Then Label6.Caption = Label2.Caption End If Private Sub Label6_Change() a = Left(Right(Label6.Caption, 3), 1) If a = "m" Then Label8.Caption = Left(Right(Label6.Caption, 7), 2) w = Val(Label8.Caption)/ 60 v = w * 0.04 * Label13 = v End If Private Sub Timer1_Timer() a = MSComm1.Input Label1.Caption = a Label5.Caption = Now Private Sub Timer2_Timer() Adodc1.Recordset.AddNew Adodc1.Recordset.Fields("waktu").Value = Label5.Caption Adodc1.Recordset.Fields("suhu").Value = Left(Label3.Caption, 14) Adodc1.Recordset.Fields("kelembaban").Value = Left(Label4.Caption, 12) Adodc1.Recordset.Fields("kecepatan_angin").Value = Left(Label6.Caption, 16) Adodc1.Recordset.Update Adodc1.Refresh

9 Data Hasil Pengukuran yang dihasilkan dari Sistem dan BMKG Waktu (11/26/2010 ) Suhu dari SHT ( o C) Kelembaban dari SHT (%) Table1 Kec.angin dari sistem(m/s) Suhu dari BMKG( o C) Kelembaban dari BMKG(%) Kec.angin dari BMKG (m/s) 6: : : : : : : : : : : : : : : : : : : : : : : : :

10 Data Hasil Pengukuran yang dihasilkan dari Sistem dan BMKG Waktu (11/22/2010 ) Suhu dari SHT ( o C) Kelembaban dari SHT (%) Table1 Kec.angin dari sistem (m/s) Suhu dari BMKG ( o C) Kelembaban dari BMKG(%) 23: : : : : : : : : : : : : : : : : : : : : : : : : : Kec.angin dari BMKG(m/s)

11 Pengujian Sistem Alat untuk Menentukan Kestabilan Data yang di Ukur. Pemilik : Ellis Naria Pakpahan Nama Alat : Prototipe Stasiun Cuaca Mini Berbasis Mikrokontroller ATmega8535 Tanggal Pengukuran : 19 November 2010 Lokasi pengukuran : Lapangan BMKG Sampali Waktu (11/19/2010) suhu ('C) kelembaban (%) kec_angin (m/s) 9: : : : : : : : : : : : : : : : : : : : : : : : :

12 Grafik Perbandingan dari Data dapat di lihat pada Gambar dibawah ini. pengukuran :35 9:45 9:55 10:05 10:15 10:25 10: Hasil Pengukuran terhadap Waktu waktu 10:45 10:55 11:10 11:20 11:30 11:40 suhu('c) kelembaban (%) kec.angin (m/s) Gambar 1. Grafik dari hasil pengukuran untuk menentukan Kestabilan data.

13 suhu('c) Perbandingan Pengukuran Suhu terhadap waktu (26/11/2010) Suhu dari SHT('C) Suhu dari BMG('C) 6:00 8:00 10:00 12:00 14:00 16:00 waktu 18:00 20:00 22:00 0:00 2:00 4:00 Gambar 2. Grafik Perbandingan Hasil Pengukuran Data Suhu antara SHT11 dengan Suhu dari BMG.

14 kelembaban (%) Perbandingan Pengukuran kelembaban terhadap waktu (26/11/2010) Kelembaban dari SHT(%) Kelembaban dari BMG(%) 6:00 10:00 12:00 14:00 16:00 18:00 20:00 22:00 0:00 2:00 4:00 8:00 waktu Gambar 3. Grafik Perbandingan Hasil Pengukuran Data Kelembaban antara SHT11 dengan Kelembaban dari BMG.

15 Kec.Angin (m/s) :00 Perbandingan Pengukuran Kec.Angin terhadap Waktu (26/11/2010) 8:00 10:00 12:00 14:00 16:00 18:00 waktu 20:00 22:00 0:00 2:00 Kec.Angin dari sistem alat (m/s) Kec.Angin dari Anemometer (m/s) 4:00 Gambar 4. Grafik Perbandingan Hasil Pengukuran Data Kec.Angin antara Fotodioda dengan Kec.Angin dari BMG.

16 ATmega8535 SCK Data