may gusto akong gayahing project
http://code.google.com/p/phduino/.... sabi kasi ng engineer sakin 1/3 lng daw ng mga parts na ito ang nasa philippines.... pls naman po... anu pa bang mga pwedeng ipalit na parts dun sa circuit na magiging compatible dito sa project na to. plano ko sana wala ng lcd na gagamitin at nde ko po alam rin pati ung alternative sa arduino board na meron sa pilipinas lng mabibili.. eto ung parts(copied from the project pHduino)
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Part Value Device Package Library Sheet
C1 100n C-EU050-025X075 C050-025X075 rcl 1
C2 100n C-EU050-025X075 C050-025X075 rcl 1
C3 100n C-EU050-025X075 C050-025X075 rcl 1
C4 100n C-EU050-025X075 C050-025X075 rcl 1
C5 100n C-EU050-025X075 C050-025X075 rcl 1
C6 100n C-EU050-025X075 C050-025X075 rcl 1
C7 100n C-EU050-025X075 C050-025X075 rcl 1
C8 100n C-EU050-025X075 C050-025X075 rcl 1
C9 100n C-EU050-025X075 C050-025X075 rcl 1
C10 100uFx25V CPOL-EUE2.5-7 E2,5-7 rcl 1
C11 100uFx25V CPOL-EUE2.5-7 E2,5-7 rcl 1
C12 100n C-EU050-025X075 C050-025X075 rcl 1
C13 100n C-EU050-025X075 C050-025X075 rcl 1
D1 BZX55C5V1 BZX55 DO35Z10 diode 1
IC1 TL072P TL072P DIL08 linear 1
IC2 TC1121CPA TC1121CPA DIL8 tc1121 1
JP1 PINHD-1X1 1X01 pinhead 1
JP2 PINHD-1X1 1X01 pinhead 1
JP3 PINHD-1X1 1X01 pinhead 1
JP4 PINHD-1X2 1X02 pinhead 1
JP5 PINHD-1X2 1X02 pinhead 1
JP6 PINHD-1X3 1X03 pinhead 1
JP7 PINHD-1X3 1X03 pinhead 1
JP8 PINHD-2X5 2X05 pinhead 1
LED1 LED3MM LED3MM led 1
LED2 LED3MM LED3MM led 1
LED3 LED3MM LED3MM led 1
MCU1 ARDUINO-USBLONG_PADS_NO_TEXT ARDUINO-USBLONG_PADS_NO_TEXT SHIELD-NOTEXT Arduino-Various 1
R1 100k R-EU_0207/5V 0207/5V rcl 1
R2 1M R-TRIMM43P RTRIM43P rcl 1
R3 10k R-TRIMM43P RTRIM43P rcl 1
R4 10k R-EU_0207/5V 0207/5V rcl 1
R5 10k R-EU_0207/5V 0207/5V rcl 1
R6 10k R-EU_0207/2V 0207/2V rcl 1
R7 10k R-EU_0207/5V 0207/5V rcl 1
R8 10k R-EU_0207/2V 0207/2V rcl 1
R9 40k2 R-EU_0207/10 0207/10 rcl 1
R10 10k R-EU_0207/10 0207/10 rcl 1
R11 1k R-EU_0207/10 0207/10 rcl 1
R12 1k R-EU_0207/7 0207/7 rcl 1
R13 1k R-EU_0207/2V 0207/2V rcl 1
R14 1k R-EU_0207/2V 0207/2V rcl 1
R15 1k R-EU_0207/2V 0207/2V rcl 1
R16 10k R-TRIMM43P RTRIM43P rcl 1
S1 TAC_SWITCHPTH TACTILE-PTH SparkFun 1
S2 TAC_SWITCHPTH TACTILE-PTH SparkFun 1
SG1 F/TMB F/TMB F/TMB buzzer 1
X1 1-227161-0 1-227161-0 AMP_227161 con-coax 1
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Parts not showed and comments¶
LCD¶
Anyone compatible with the HD44780 controller with two lines and 16 columns. You can use a different one and change the code.
It is not necessary to control the pHduino if you want to control it only by serial port. In this case, you don't need the connector JP8 and the trimpot R16.
Temperature sensor¶
Use the LM35DZ (TO-92 package). WARNING! Don't put it inside of the water or you will damage your circuit! I suggest you put it outside of the reservoir, using a adhesive tape, that you want to measure.
It is not necessary if the environment has a short variation of temperature. Your could fix the pH measurement by software. The pHduino firmware has an option to set a fixed temperature value. In this case, the capacitors C8, C9 and the connector JP6 are not necessary.
http://www.national.com/mpf/LM/LM35.html J-FET Operational Amplifier¶
The IC1 could be replaced by the TL082. Today, there is no electric difference between these operational amplifiers. Read the datasheets.
http://www.datasheetcatalog.com/datasheets_pdf/T/L/0/7/TL072.shtml http://www.datasheetcatalog.com/datasheets_pdf/T/L/0/8/TL082.shtml Negative Charge Pump¶
The IC2 TC1121 can be replaced by the ICL7660, ICL7660A, or ICL7660S. The ICL7660S is a direct replacement for the industry standard ICL7660 offering an extended operating supply voltage range up to 12V, with lower supply current. But, you need left the low voltage LV pin (pin 6) not connected. Just rise it or cut it.
TC1121 from Microchip
http://www.microchip.com/wwwproducts/Devices.aspx?dDocName=en010559 ICL7660S from Intersil
http://www.intersil.com/products/deviceinfo.asp?pn=ICL7660S ICL7660 / ICL7660A from Intersil
http://www.intersil.com/products/deviceinfo.asp?pn=ICL7660 Sockets for the integrated circuits¶
I suggest you use 8 pins sockets for the IC1 and IC2 and a PCB with very neat welds. Remember that input impedance is about 1E12 ohms. Make a neat job.
Microcontroller¶
In this version, I am using a Arduino board. You can change to use a RBBB, Teensy or other compatible Arduino microcontroller.
Control button¶
It is not in use by now. It is for a custom control. You could remove the push button S2, the resistor R15, the capacitor R13, and the connector JP5.
Buzzer¶
It is not necessary for the pHduino operation. In case you don't need sound alarms, you could remove the buzzer SG1.
Status LED¶
It is not necessary for the pHduino operation. In case you don't need visual alarms, you could remove LED3 and the resistor R12.
Test points¶
There are three test points. You don't really need them. You could remove the JP1 (VSENSE), JP2 (VREF), and JP3 (GND).
Power Monitors¶
The LED1 and LED2 show if +5V and the -5V are on. You don't really need them. You could remove LED1, LED2, and the resistors R13 and R14.
