DIY pH meter
- saikumar
- Aspiring Star of AquapetZ!
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DIY pH meter
Heyllo, I was looking at one thread on Reefcentral, that looked dependable and dint need too much money to make one. So started to build, and its getting near to implement.
http://www.reefcentral.com/forums/showt ... p=16463909
Need, was to display & monitor the pH continiously, to know whats to be done next to keep water stable. Also plan to add buzzer to sound when extreme is reached. May be in future can rig it to a calcium reactor or RO system to maintain pH.
Here is the progress so far, and to mention the thread from TeraHz that helped it all to make it happen. I just added a mini-Arduino on board(left side on circuit board) to make a display and do the alarm function, this addition made things easy as it increased the length of the wiring display 3 fold, so can have the probe in sump and display on tank hood. This arduino will basically do an Analog(pH voltage at probe) to digital(pH value on display) conversion.
Let me know if you got doubts anywhere.
The below was done in eagle scehmatics edited by me a bit.
The boards coming out of fabrication house after lots of hassles.
The components filling in, still way to go. Most of them are 1%-5% components, avoiding any reading swings by temperature. Same time price increased too much. But should be a good compromise
Maintaining all pics on gallery below, cant risk losing them like the reflector pics
http://indianaquariumhobbyist.com/galle ... +pH+meter/
Still pending,
(a)the arduino code to do the A2D and display. (the easiest part )
(b)Waiting for few components more.
(c) the pH probe itself, plan to get a lab grade one. Still thinking
Till then!
http://www.reefcentral.com/forums/showt ... p=16463909
Need, was to display & monitor the pH continiously, to know whats to be done next to keep water stable. Also plan to add buzzer to sound when extreme is reached. May be in future can rig it to a calcium reactor or RO system to maintain pH.
Here is the progress so far, and to mention the thread from TeraHz that helped it all to make it happen. I just added a mini-Arduino on board(left side on circuit board) to make a display and do the alarm function, this addition made things easy as it increased the length of the wiring display 3 fold, so can have the probe in sump and display on tank hood. This arduino will basically do an Analog(pH voltage at probe) to digital(pH value on display) conversion.
Let me know if you got doubts anywhere.
The below was done in eagle scehmatics edited by me a bit.
The boards coming out of fabrication house after lots of hassles.
The components filling in, still way to go. Most of them are 1%-5% components, avoiding any reading swings by temperature. Same time price increased too much. But should be a good compromise
Maintaining all pics on gallery below, cant risk losing them like the reflector pics
http://indianaquariumhobbyist.com/galle ... +pH+meter/
Still pending,
(a)the arduino code to do the A2D and display. (the easiest part )
(b)Waiting for few components more.
(c) the pH probe itself, plan to get a lab grade one. Still thinking
Till then!
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- SCORPIO
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Re: DIY pH meter
I can appreciate only. You are really a Master of DIY Projects.
“Take up one idea. Make that one idea your life - think of it, dream of it, live on that idea. This is the way to success.”
...................Swami Vivekananda
...................Swami Vivekananda
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Re: DIY pH meter
OOOHHHH man this is some serious stuff, keep it coming
- saikumar
- Aspiring Star of AquapetZ!
- Posts: 974
- Joined: Sat Nov 17, 2012 7:44 am
- Location: Secunderabad(far from REZ)
Re: DIY pH meter
Works beautifully this one. goes smooth. Can extend my wiring to 5m appx.
Many thanks to Georgi from Reefcentral-Terahz for the quick debug of circuit. There is a bad connection to the 7809 in above PCB, need to cut and reroute it.
This is the code at Arduino on pH PCB
This is the code at the mother Arduino
The "ORBIT-WHITE" part, super stable reading in somany readings.
On left is the completed board, on right is the mother Arduino, and in center is the lab grade pH probe.
Cheers! hope the code, diagrams and PCB helps someone to make yourself.
Good night!
Many thanks to Georgi from Reefcentral-Terahz for the quick debug of circuit. There is a bad connection to the 7809 in above PCB, need to cut and reroute it.
This is the code at Arduino on pH PCB
Code: Select all
#include <EasyTransfer.h>
//The pins 2=Rx,3=Tx
//create object
EasyTransfer ET;
struct SEND_DATA_STRUCTURE{
//put your variable definitions here for the data you want to send
//THIS MUST BE EXACTLY THE SAME ON THE OTHER ARDUINO
int val_ph_a;
int val_ph_b;
};
//give a name to the group
SEND_DATA_STRUCTURE mydata;
int analogPin = 5; // potentiometer wiper (middle terminal) connected to analog pin 3
// outside leads to ground and +5V
int val = 0; // variable to store the analog value read
float val_ph=0; //store the float multipled value
int i=0,j;
float val_ph_array[5]={0,0,0,0,0};
void setup()
{
Serial.begin(9600); // setup serial
//start the library, pass in the data details and the name of the serial port. Can be Serial, Serial1, Serial2, etc.
ET.begin(details(mydata), &Serial);
for(j=0; j<20;j++)//run a few times before sending over serial, so that array is not blank
{
val = analogRead(analogPin); // read the input pin
if (i>4)
i=0;
val_ph_array[i]=val * 0.02;// calculate WRT voltage
val_ph=float (val_ph_array[0] + val_ph_array[1] + val_ph_array[2] + val_ph_array[3] + val_ph_array[4])/5;//normalizing any of the error data
i++;
}
}
void loop()
{
val = analogRead(analogPin); // read the input pin
if (i>4)
i=0;
val_ph_array[i]=val * 0.02;// calculate WRT voltage
val_ph=float (val_ph_array[0] + val_ph_array[1] + val_ph_array[2] + val_ph_array[3] + val_ph_array[4])/5;//normalizing any of the error data
i++;
mydata.val_ph_a=val_ph;
mydata.val_ph_b=(val_ph- mydata.val_ph_a)*100;
Serial.println(val); // debug value
ET.sendData();
delay(1000); //send pH every 1sec to mother Arduino
}
Code: Select all
#include <SoftEasyTransfer.h>
/* For Arduino 1.0 and newer, do this: */
#include <SoftwareSerial.h>
SoftwareSerial mySerial(10, 11); //RX TX hard coded, not the main UARTs
/* For Arduino 22 and older, do this: */
//#include <NewSoftSerial.h>
//NewSoftSerial mySerial(2, 3);
//create object
SoftEasyTransfer ET;
struct RECEIVE_DATA_STRUCTURE{
//put your variable definitions here for the data you want to receive
//THIS MUST BE EXACTLY THE SAME ON THE OTHER ARDUINO
int tens_part;
int deci_part;
};
//give a name to the group of data
RECEIVE_DATA_STRUCTURE mydata;
void setup(){
mySerial.begin(9600);
Serial.begin(9600);
//start the library, pass in the data details and the name of the serial port.
ET.begin(details(mydata), &mySerial);
pinMode(13, OUTPUT);
Serial.println("sjklads ghewre");
}
void loop(){
//check and see if a data packet has come in.
if(ET.receiveData())
{
//this is how you access the variables. [name of the group].[variable name]
//since we have data, we will blink it out.
/*for(int i = mydata.blinks; i>0; i--){
digitalWrite(13, HIGH);
delay(mydata.pause * 100);
digitalWrite(13, LOW);
delay(mydata.pause * 100);
}*/
Serial.print(mydata.tens_part);
Serial.print(".");
Serial.print(mydata.deci_part);
Serial.println("");
}
//you should make this delay shorter then your transmit delay or else messages could be lost
delay(250);
}
The "ORBIT-WHITE" part, super stable reading in somany readings.
On left is the completed board, on right is the mother Arduino, and in center is the lab grade pH probe.
Cheers! hope the code, diagrams and PCB helps someone to make yourself.
Good night!
Last edited by saikumar on Thu Jun 06, 2013 12:51 am, edited 1 time in total.
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Re: DIY pH meter
toooooo tough to handle .... great going buddy....
keep 'em coming
keep 'em coming
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- saikumar
- Aspiring Star of AquapetZ!
- Posts: 974
- Joined: Sat Nov 17, 2012 7:44 am
- Location: Secunderabad(far from REZ)
Re: DIY pH meter
Edited, can you guys see the above pics now? I attached reefcentral link directly, so not sure if it worked.
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Re: DIY pH meter
Not easy to made. Congratulations on your success.
“Take up one idea. Make that one idea your life - think of it, dream of it, live on that idea. This is the way to success.”
...................Swami Vivekananda
...................Swami Vivekananda
- saikumar
- Aspiring Star of AquapetZ!
- Posts: 974
- Joined: Sat Nov 17, 2012 7:44 am
- Location: Secunderabad(far from REZ)
Re: DIY pH meter
Thankyou sir. I feel the same when you grow plants in just normal substrate and glut, just like magician.SCORPIO wrote:Not easy to made. Congratulations on your success.
Cheers!