Kategori: Mikrokontroller
Mengubah USB ISP menjadi USBASP
USBISP berbeda dengan USBASP. USBISP tidak dapat dioperasikan dengan AVRDude, namun harus menggunakan PROG ISP. USB ISP menggunakan uC ATmega88, dengan skema mirim USBASP namun bedanya adalah pin D- pada USB dihubungkan ke PD3, jadi PD3 harus diubah menjadi pin INPUT.
Agar dapat berfungsi jadi USBASP, maka download firmware dari https://www.fischl.de/usbasp/usbasp.2011-05-28.tar.gz dan ekstrak.
Buka file bin/usbasp.atmega88.2011-05-28.hex menggunakan notepad++ atau wordpad.
Lihat pada baris 100B8000,
:100B8000D9F77A9589F708951BB815B88BEF8AB90C
ubah menjadi :
:100B8000D9F77A9589F708951BB815B880EF8AB917
ubah ldi pada DDRD 8BEF menjadi 80EF
dan ubah checksum dari 0C menjadi 17
Buka kemasan USBISP dan hubungkan via (lubang) yang ditandai <– UP –> menggunakan kabel kecil.
Upload dengan USBASP atau Arduino yang telah dijadikan Arduino as ISP.
Note:
# TARGET=atmega8 HFUSE=0xc9 LFUSE=0xef
# TARGET=atmega48 HFUSE=0xdd LFUSE=0xff
# TARGET=atmega88 HFUSE=0xdd LFUSE=0xff
gunakan HEX berikut, jika uC yang digunakan adalah ATmega8:
:100000003BC09FC554C053C052C051C050C04FC028
:100010004EC04DC04CC04BC04AC049C048C047C08C
:1000200046C045C044C0040309041C0377007700A0
:1000300077002E00660069007300630068006C00A2
:100040002E00640065000E0355005300420061005D
:100050007300700012011001FF000008C016DC05DB
:1000600003010102000109021200010100801909C7
:10007000040000000000000011241FBECFE5D4E002
:10008000DEBFCDBF10E0A0E6B0E0E0EAFDE002C0D8
:1000900005900D92A236B107D9F710E0A2E6B0E0C4
:1000A00001C01D92A73AB107E1F702D077C6A8CFE9
:1000B00012BA18BA11BA8FEF87BB17BA93E094BB84
:1000C0008EEF85BB93BF08D478940DD4FECFFF92FA
:1000D0000F931F93CF93DF939C01F62E80916200C4
:1000E000813021F4E90110E000E078C08430D1F3E0
:1000F0001FEF77C080916200813079F580917300A5
:100100009091740020916F003091700040917100C7
:1001100050917200892B31F4CA01B901488121E064
:1001200088D321C0CA01B901488120E082D38091DF
:1001300076008150809376008823A9F460916F0047
:10014000709170008091710090917200488126D367
:10015000809173008093760006C080916F0090912B
:1001600070006881F7D280916300909164000197DC
:100170009093640080936300892BD9F410926200FD
:100180008091750081FF14C08091760090E02091ED
:100190007300309174008217930751F060916F00E3
:1001A0007091700080917100909172004881F6D238
:1001B00011E080916F0090917000A0917100B0915A
:1001C00072000196A11DB11D80936F009093700085
:1001D000A0937100B09372000F5F21960F1508F481
:1001E00089CF812FDF91CF911F910F91FF900895BB
:1001F0000F931F93CF93DF939C01062F8091620092
:100200008250823010F00FEF32C0E90110E029C0B7
:1002100080916200823051F460916F0070917000A3
:10022000809171009091720043D205C080916F005F
:100230009091700071D2888380916F0090917000CE
:10024000A0917100B09172000196A11DB11D809323
:100250006F0090937000A0937100B09372001F5FC5
:1002600021961017A8F2083010F410926200802F27
:10027000DF91CF911F910F910895CF93DF93EC0100
:100280008981813061F49A9902C085E002C0809131
:1002900065001FD110926600A99879D104C0823000
:1002A00021F496D1A99A20E0F7C0833011F5E091AE
:1002B0007800F09179008A81099580936700E09138
:1002C0007800F09179008B81099580936800E09126
:1002D0007800F09179008C81099580936900E09114
:1002E0007800F09179008D81099580936A0024E06F
:1002F000D3C0843011F580916600882391F49B81EE
:1003000080E02A8130E0822B932BAA2797FDA095CD
:10031000BA2F80936F0090937000A0937100B093F8
:1003200072009F8180E02E8130E0822B932B90938E
:1003300064008093630082E090C0873011F5809163
:100340006600882391F49B8180E02A8130E0822B33
:10035000932BAA2797FDA095BA2F80936F009093B7
:100360007000A0937100B09372009F8180E02E8195
:1003700030E0822B932B909364008093630083E0A2
:100380006CC0853021F451D18093670084C08630E1
:10039000D9F580916600882391F49B8180E02A81C1
:1003A00030E0822B932BAA2797FDA095BA2F80933C
:1003B0006F0090937000A0937100B09372008C81D5
:1003C0009D81292F2F7020937500492F50E0407F89
:1003D000507094E0440F551F9A95E1F7480F511D56
:1003E000509374004093730020FF02C04093760046
:1003F0009F8180E02E8130E0822B932B90936400CC
:100400008093630081E029C0883059F580916600AF
:10041000882391F49B8180E02A8130E0822B932B0A
:10042000AA2797FDA095BA2F80936F009093700034
:10043000A0937100B0937200109274001092730038
:10044000109275009F8180E02E8130E0822B932BEB
:10045000909364008093630084E0809362002FEFA8
:100460001BC0893081F481E0809366008A819B8182
:10047000AC81BD8180936F0090937000A093710058
:10048000B093720010CF8A3009F00DCF8A8180932B
:1004900065001092670021E087E690E090938C0061
:1004A00080938B00822FDF91CF910895382F90E0B9
:1004B00006C022B782B7821B8C33E0F39F5F93178D
:1004C000C0F3089580917B008DB980917A008EB938
:1004D0000895282F882311F42AE002C0883028F1DB
:1004E00080E193E0909379008093780010927A00F5
:1004F0002930A9F02A3018F4283051F412C02B30DA
:1005000029F02C3029F481E080937A0081E50AC03B
:1005100082E580937B0081E080937A00089582E5F4
:1005200001C083E580937B00089580EF92E0909373
:100530007900809378002430B1F0253038F42230EF
:10054000B1F0233090F42130C9F415C0263031F0D9
:10055000263038F0273091F483E00AC020937C00E5
:1005600008958CE005C088E103C080E301C080E607
:1005700080937C00089580EC80937C00089522B7DE
:1005800090917C0082B7821B8917E0F3089587B3AE
:100590008C6287BBC298C59892B720917C0082B7C5
:1005A000891B8217E0F3C29A92B782B7891B821720
:1005B000E0F3C29880917800909179008051934047
:1005C00031F480917B008DB980917A008EB90895C5
:1005D00087B3837D87BB88B3837D88BB1DB80895AF
:1005E000482F50917C0020E030E047FF02C0C39AC2
:1005F00001C0C398220FB4992F5FC59A92B782B7F2
:10060000891B8517E0F3C59892B782B7891B8517B8
:10061000E0F33F5F383011F0440FE7CF822F0895A9
:100620008FB9779BFECF8FB108950F931F9300E290
:1006300039C0E0917800F09179008CEA0995E09159
:100640007800F091790083E50995E0917800F091C8
:10065000790080E00995182FE0917800F0917900F9
:1006600080E00995133511F480E01FC01DB8C59ACC
:1006700092B720917C0082B7891B8217E0F3C5985E
:1006800092B782B7891B8217E0F38091780090912E
:1006900079008051934031F480917B008DB9809135
:1006A0007A008EB9015028F681E01F910F910895CC
:1006B000EF92FF920F931F937B018C01862F817025
:1006C000880F880F880FE0917800F09179008062A0
:1006D0000995D801C70129E0B695A7959795879503
:1006E0002A95D1F7E0917800F09179000995169557
:1006F0000795F794E794E0917800F09179008E2DBA
:100700000995E0917800F091790080E009951F91BA
:100710000F91FF90EF9008950F931F938C01E0913C
:100720007800F091790080EA0995E0917800F091E5
:100730007900812F0995E0917800F0917900802F60
:100740000995E0917800F091790080E009951F917A
:100750000F910895FF920F931F938C01F62EE09155
:100760007800F091790080EC0995E0917800F091A3
:100770007900812F0995E0917800F0917900802F20
:100780000995E0917800F09179008F2D09958EE11F
:100790008DDE80E01F910F91FF900895CF92DF9240
:1007A000EF92FF920F931F936B017C01142FE09146
:1007B0007800F09179008CE40995D701C60149E0F1
:1007C000B695A795979587954A95D1F7E0917800CA
:1007D000F09179000995D701C601B695A79597952F
:1007E0008795E0917800F09179000995E091780083
:1007F000F091790080E009951F3F19F48FE056DEF3
:1008000007C002B71EE1C701B60152DF8F3F11F0EA
:1008100080E008C082B7801B8D33A8F302B7115067
:1008200091F781E01F910F91FF90EF90DF90CF90B3
:100830000895CF92DF92EF92FF920F931F936B0177
:100840007C01042F122F862F8170880F880F880F4C
:10085000E0917800F091790080640995D701C60194
:1008600069E0B695A795979587956A95D1F7E09138
:100870007800F09179000995D701C601B695A79542
:1008800097958795E0917800F09179000995E0912E
:100890007800F0917900802F09951123A9F00F3786
:1008A00019F48FE003DE10C002B71EE1C701B601E4
:1008B000FFDE8F3749F482B7801B8D33B8F302B760
:1008C0001150A1F781E001C080E01F910F91FF90CE
:1008D000EF90DF90CF90089585B7836085BF8BB789
:1008E00080648BBF08951F93CF93DF9360918D0039
:1008F000635067FDA3C080918A00CCE0D0E0C81BA4
:10090000D109CF56DF4F809189008D3209F084C024
:10091000683009F091C083EC80937D008AE5809374
:100920006000109277008881807639F0CE01A5DCD6
:10093000282F8F3F09F45FC065C09A81109286000E
:100940008981882321F41092870022E04DC08530F0
:1009500019F490938E0047C08630B1F58B818130B9
:1009600019F484E590E004C0823041F486E690E01A
:1009700090938C0080938B0022E122C08330F9F4A5
:100980008A81882341F486E290E090938C008093E2
:100990008B0024E015C0813041F48AE290E090930E
:1009A0008C0080938B002CE10BC0823041F486E4F4
:1009B00090E090938C0080938B002EE001C020E0AB
:1009C00080E4809377001EC0883021F421E080E924
:1009D00090E00CC0893019F49093900004C08A30E4
:1009E00011F421E001C020E086E890E090938C00B3
:1009F00080938B0007C0888187FD2E8180E88093DB
:100A0000770006C08F81882319F48E81821708F041
:100A1000822F8093610010C08091770087FF0CC007
:100A2000CE0155DB8F3F21F48EE18093600004C03E
:100A3000882311F01092610010928D008091600067
:100A400084FF58C0809161008F3F09F453C0182F74
:100A5000893008F018E0811B8093610080917D004F
:100A600098E8892780937D00112391F18091770088
:100A700087FF08C08EE790E0612FBADB182F89301E
:100A800098F526C020918B0030918C0086FF0DC018
:100A9000AEE7B0E080E090E0F901E80FF91FE491E3
:100AA000ED9301961817C1F708C0912FD901EEE711
:100AB000F0E08D9181939150E1F71150812F90E0FA
:100AC0001F5F0196820F931F90938C0080938B0081
:100AD0008EE790E0612F31D0612F6C5F6C3041F078
:100AE0008FEF8093610004C08FEF809361006EE10F
:100AF0006093600094E186B3837031F49150D9F72C
:100B000010928E0010928800DF91CF911F9108956E
:100B1000A82FB92F80E090E041E050EA60956F5F28
:100B200058F42D9138EF82279795879510F08427F8
:100B300095273F5FC8F3F3CF0895EADF8D939D9328
:100B40000895CF93CFB7CF93C395B09BE9F7B09BF0
:100B500009C0B09B07C0B09B05C0B09B03C0B09B51
:100B600001C0A1C0DF93C0918A00DD27CF56DF4FBF
:100B7000B09B02C0DF91EBCF2F930F931F9306B36F
:100B80002FEF00FB20F94F933F9316B34FEF012750
:100B900000FB21F93BE031C04E7F012F16B32160ED
:100BA00028C0102F4D7F2260000006B329C04B7F64
:100BB0002460012F000016B32BC016B3477F2860B6
:100BC0002AC04F7E06B320612CC04F7D16B3206231
:100BD0002FC04F7B06B3206432C0422706B349932F
:100BE0004FEF0000102710FB20F916B31370C9F166
:100BF000297F91F2012700FB21F906B3237F89F2B7
:100C0000315058F1102710FB22F916B3277E79F2E4
:100C1000012700FB23F92F7C81F206B3102710FB7C
:100C200024F92F7971F200C016B3012700FB25F9D2
:100C30002F7359F200C006B3102710FB26F922309B
:100C400040F200C016B3012700FB27F9243028F634
:100C50004F77206816B30000F9CF10E41ABF0027C1
:100C600017C03B503195C31BD04010E41ABF088118
:100C7000033CE9F00B34D9F0209188001981110F61
:100C80001213EDCF093641F10D3211F0013E39F763
:100C900000938F003F914F911F910F912F91DF9102
:100CA000CAB7C6FD51CFCF91CFBFCF911895209134
:100CB0008F00222379F310918D00112311F5343028
:100CC00012F130938D002093890010918A003BE04F
:100CD000311B30938A0017C000918D0001308CF4D5
:100CE0000AE53091600034FD10C000936000CDE74C
:100CF000D0E00FC02795A8F45150A9F4220F0000AE
:100D0000F9CF4AE503C042ED01C0432FC4E1D0E072
:100D100032E017B31360C09A17BB08B320E413E0A6
:100D20005F93012756E008BB279520F4515021F42A
:100D3000220FF9CF012756E000003B5A08BBD0F242
:100D4000279528F4515029F4220F0000F9CF0127EC
:100D500056E0279508BB20F4515021F4220FF9CF1B
:100D6000012756E02991332308BB21F60C7F10910F
:100D70008E00110FC651D04008BB11F010938800AF
:100D800010E41ABF016017B31C7F402F4C7F5F91A6
:100D900000C000C008BB17BB48BB7CCFF894FFCF96
:020DA0005AFFF8
:00000001FF
Menambahkan Bootloader ATMega8 di Arduino versi 1.5.x ke atas
buka file platforms.txt
cari bagian: tools.avrdude
copy paste barisnya dan ubah menjadi tools.avrdudeM8 dengan menghapus -Uefuse:w:{bootloader.extended_fuses}:m
# AVR Uploader/Programmers tools M8
# ------------------------------
tools.avrdudeM8.cmd.path={runtime.ide.path}/hardware/tools/avr/bin/avrdude
tools.avrdudeM8.config.path={runtime.ide.path}/hardware/tools/avr/etc/avrdude.conf
tools.avrdudeM8.upload.params.verbose=-v -v -v -v
tools.avrdudeM8.upload.params.quiet=-q -q
tools.avrdudeM8.upload.pattern="{cmd.path}" "-C{config.path}" {upload.verbose} -p{build.mcu} -c{upload.protocol} -P{serial.port} -b{upload.speed} -D "-Uflash:w:{build.path}/{build.project_name}.hex:i"
tools.avrdudeM8.program.params.verbose=-v -v -v -v
tools.avrdudeM8.program.params.quiet=-q -q
tools.avrdudeM8.program.pattern="{cmd.path}" "-C{config.path}" {program.verbose} -p{build.mcu} -c{protocol} {program.extra_params} "-Uflash:w:{build.path}/{build.project_name}.hex:i"
tools.avrdudeM8.erase.params.verbose=-v -v -v -v
tools.avrdudeM8.erase.params.quiet=-q -q
tools.avrdudeM8.erase.pattern="{cmd.path}" "-C{config.path}" {erase.verbose} -p{build.mcu} -c{protocol} {program.extra_params} -e -Ulock:w:{bootloader.unlock_bits}:m -Uhfuse:w:{bootloader.high_fuses}:m -Ulfuse:w:{bootloader.low_fuses}:m
tools.avrdudeM8.bootloader.params.verbose=-v -v -v -v
tools.avrdudeM8.bootloader.params.quiet=-q -q
tools.avrdudeM8.bootloader.pattern="{cmd.path}" "-C{config.path}" {bootloader.verbose} -p{build.mcu} -c{protocol} {program.extra_params} "-Uflash:w:{runtime.platform.path}/bootloaders/{bootloader.file}:i" -Ulock:w:{bootloader.lock_bits}:m
Buka Board.txt, cari atmegang.menu.cpu.atmega8=ATmega8 dan tambahkan diatasnya:
atmegang.menu.cpu.atmega8.bootloader.tool=avrdudeM8
Selanjutnya pilih Board: ArduinoNG, Processor: ATmega8, Programmer: (sesuaikan)
Siap untuk klik, Burn Bootloader
Belajar membuat robot berkaki 4 – quadruped
- Rangkai rangka robot dengan motor servo, jangan pasang shaft-nya
- Pasangkan motor servo ke pin 2 s.d 13 Arduino
- Putar motor servo ke 90 derajat dengan script berikut:
- Pasangkan rangkanya dengan membentuk robot yang sedang berdiri dan kencangkan sekrup
- Upload skrip berikut ke arduino:
Pemanfaatan Timer pada ESP8266
Interrupt Software Timer
#include <ESP8266WiFi.h> #include <Ticker.h> Ticker blinker; #define LED 2 //On board LED void changeState() { digitalWrite(LED, !(digitalRead(LED))); } void setup() { pinMode(LED,OUTPUT); blinker.attach(0.5, changeState); //atau attach_ms dalam milisecond } void loop() { }
Interrupt Hardware Timer (Timer1), Timer0 tidak bisa digunakan karena untuk koneksi WiFi
#include <ESP8266WiFi.h> #include <Ticker.h> Ticker blinker; #define LED 2 //On board LED void ICACHE_RAM_ATTR onTimerISR(){ digitalWrite(LED,!(digitalRead(LED))); //Toggle LED Pin timer1_write(600000);//12us } void setup() { pinMode(LED,OUTPUT); timer1_attachInterrupt(onTimerISR); timer1_enable(TIM_DIV16, TIM_EDGE, TIM_SINGLE); timer1_write(600000); //120000 us } void loop() { }
Sumber:
https://circuits4you.com/category/esp8266/
https://www.switchdoc.com/category/esp8266/
Driver PL2303HX untuk Windows 10 64bit
Pernah beli alat USB to Serial Converter murah, dengan IC PL2303. Saat dipasang di komputer, ternyata butuh driver. Alhasil menemukan driver di situs produsen IC namun ada catatan :
Windows 8/8.1/10 are NOT supported in PL-2303HXA and PL-2303X EOL chip versions.
Untungnya ada situs yang baik hati (lupa dimana) memberikan file hasil modifikasi driver Windows 7 agar bisa dipasang di Windows 10.
Link: https://latiful.hayat.web.id/file/PL2303HX-edit.zip
Semoga bisa bermanfaat
Contoh kode interupsi I2S pada WAU8822 pada Nuvoton NUC-LB140
Contoh loopback dari dan ke WAU serta pembentukan sinyal sinusoida
#include "NUC100Series.h"
#include "gpio.h"
#include "portinit.h" //lcd
#include "lcd.h"
#include "wau8822n.h"
# define PLLCON_SETTING CLK_PLLCON_50MHz_HIRC
# define PLL_CLOCK 50000000
# define HCLK_DIV 1
#define MUTE_OFF(x) PE->DOUT &= ~(1 << 14)
#define MUTE_ON(x) PE->DOUT |= (1 << 14)
//#define POOLING
#define LOOPBACK 1
#define MONOTOSTEREO 1
#define GAIN 1//50
#define SIN_SAMPLES 32
int32_t i32SinIdx = 0;
int16_t i16Sin[SIN_SAMPLES] = {
0,3203,6284,9124,11612,13655,15172,16106,16423,16107,15172,13655,
11613,9124,6284,3204,1,-3205,-6284,-9124,-11613,-13654,-15173,-16107,
-16422,-16106,-15172,-13655,-11613,-9123,-6285,-3203
};
uint32_t g_u32TxValue;
uint32_t connect=TRUE;
void displayLCD(){
//PC15=0;
print_Line(0, " Teknik Elektro ");
printS(2*8+4,1*16,"Universitas"); //printS(x, y, char)
printS(2*8,2*16,"Muhammadiyah");
printS(3*8,3*16, "Purwokert0");
connect=FALSE;
}
uint32_t spectrum[128];
volatile uint8_t ii=0;
extern void wau(void){
uint8_t i;
for(i=0;i<128;i++){
spectrum[i]=0;
}
SYS_UnlockReg(); // Unlock protected registers
CLK_EnableXtalRC(CLK_PWRCON_XTL12M_EN_Msk | CLK_PWRCON_OSC10K_EN_Msk ); // Enable HXT external 12MHz cyrstal
CLK_SetCoreClock(50000000); // Set HCLK frequency 50MHz
SYS_LockReg(); // Lock protected registers
Port_Init(SPI3PORT);
init_LCD();
clear_LCD();
//I2C - I2S WAU8822 codec
WAU8822_Config();
GPIO_SetMode(PE, BIT14, GPIO_PMD_OUTPUT);
PE14=0; //PHone OUT Enable (NUC-LB-140)
#ifdef POOLING
//uint32_t u32Tmp;
//open I2S function
//st.u32SampleRate = 16000;
//st.u8WordWidth = I2S_DATABIT_16;
//st.u8AudioFormat = I2S_STEREO;
//st.u8DataFormat = I2S_FORMAT_I2S;
//st.u8Mode = I2S_MODE_SLAVE;
//st.u8TxFIFOThreshold = I2S_FIFO_TX_LEVEL_WORD_0;
//st.u8RxFIFOThreshold = I2S_FIFO_RX_LEVEL_WORD_8;//SMP_ONE
I2S_Open(I2S,I2S_MODE_MASTER,32000,I2S_DATABIT_16,I2S_STEREO,I2S_FORMAT_I2S);
// Set MCLK and enable MCLK
I2S_EnableMCLK(I2S,6000000);
while(1)
{
if((I2S->STATUS & I2S_STATUS_TXFULL_Msk) == 0)
{
u32Tmp = i16Sini[i32SinIdxi];
u32Tmp &= 0xFFFFUL;
//u32Tmp |= u32Tmp << 16; //duplicate it to stereo to Tx FIFO
I2S->TXFIFO = u32Tmp;
i32SinIdxi++;
if(i32SinIdxi >= SIN_SAMPLESi)
i32SinIdxi = 0;
}
}
#else
//interrupt
I2S_Open(I2S,I2S_MODE_SLAVE,32000,I2S_DATABIT_16,I2S_STEREO,I2S_FORMAT_I2S);
I2S_EnableMCLK(I2S,12000000);
I2S_EnableInt(I2S,I2S_IE_RXTHIE_Msk );
NVIC_EnableIRQ(I2S_IRQn);
GPIO_SetMode(PC,BIT12,GPIO_PMD_OPEN_DRAIN);PA12=1;
GPIO_SetMode(PC,BIT14,GPIO_PMD_OPEN_DRAIN);
if(PE15==1) displayLCD();
while(1)
{
CLK_SysTickDelay(1000000);
if(PE15==0)
{
if(connect==FALSE) {
clear_LCD();
print_Line(0, "Line-In Sound OK");
}
PC12 ^= 1; //in LIN connected
connect=TRUE;
}else{
if(connect){displayLCD();}
}
}
#endif
}
void I2S_IRQHandler(void)
{
uint32_t u32Tmp=0;
//unit32_t s =
/* Fill sin samples to I2S until Tx FIFO full */
while((I2S->STATUS & I2S_STATUS_TXFULL_Msk) == 0)
{
#if LOOPBACK // Just loop Rx FIFO to Tx FIFO
u32Tmp = I2S->RXFIFO;
I2S->TXFIFO = (u32Tmp*GAIN);
#elif MONOTOSTEREO // Mono data in Rx FIFO and duplicate it to stereo to Tx FIFO
u32Tmp = I2S->RXFIFO*GAIN & 0xFFFF0000UL;
u32Tmp |= u32Tmp >> 16;
I2S->TXFIFO = u32Tmp;
#else // Output Sin Wave
u32Tmp = i16Sin[i32SinIdx];
u32Tmp &= 0xFFFFUL;
u32Tmp |= u32Tmp << 16;
I2S->TXFIFO = u32Tmp;
i32SinIdx++;
if(i32SinIdx >= SIN_SAMPLES)
i32SinIdx = 0;
#endif
}
ii = u32Tmp;
PC->DOUT ^= (1 << 14);
}
Ways to detect heart rate
Based on Onitsch Cartoons, he can measure hetbeat using piezzoelectric by taped the sensor into his finger.
Its using arduino board and make it works great without noise. Here is the skecth:
Connect piezzoelectric into A2, or may another Analog input pin by change A2 code above into another Analog input. For fine result, it can be filterred and gained using following schematic. The schematic is from amgalbu whose post his article into element14 community. He is using oprocoupler instead of using piezzoelectirc
The basic idea is that the operational amplifier sums up Vcc/2 with the amplified DC component of the Vsensor. Vcc/2 is obtained through the R4/R5 partitor. The AC component is measured on the C5 capacitor. This signal is amplified by a factor of 330 (R1/R2). The RF1 trimmer will make it possible to fine-tune the gain (amgalbu)
I have not test it yet, but I’m sure it will be working great. I just need a time to check it out
Memprogram AT89S52 dengan Arduino
Programmer AT89S51 biasanya membutuhkan koneksi serial, namun laptop tidak memiliki port serial. Karena Arduino menggunakan port serial, maka bisa dimanfaatkan menjadi programmer AT89S52.
Siapkan arduino dengan kode berikut:
lalu upload ke arduino.
Siapkan rangkaian sesuai skema berikut:
Lalu gunakan applikasi file uploader untuk upload file
Kalibrasi MPU6050
MPU6050 adalah sensor sudut dan percepatan atau biasa disebut gyrometer. Sama seperti kebanyakan sensor lain, MPU6050 perlu dikalibrasi sebelum digunakan. Kinerja gyrometer ini sangat terpengaruh terhadap suhu, jadi pastikan suhu stabil terlebih dahulu sebelum melakukan proses kalibrasi. Beri jarak waktu antara 3 sampai dengan 5 menit setelah power on agar suhu stabil. Hasil proses kalibrasi pun akan berbeda saat dilakukan di suhu ruangan dibandingkan dengan kalibrasi di luar ruangan. Pastikan dikalibrasi pada suhu ruangan yang sama, atau setidaknya hampir sama, dengan dengan suhu dimana alat akan digunakan.
Berikut kode kalibrasi dari Luis Ródenas denga sedikit modifikasi:
Pastikan sudah melakuan instalasi librari I2Cdev dan MPU6050 dan hubungkan MPU6050 dengan skema berikut
Taru MPU6050 pada bidang datar, semisal meja dan jangan digerakkan sampai proses kalibrasi selesai. Selanjutnya, untuk proses kalibrasi, buka dengan serial monitor dengan baud rate 115200 dan kirimkan satu huruf (bebas) lalu tekan send atau klik tombol enter. Tunggi hingga daftar offset muncul dengan ditandai tulisan ‘Your offsets:’