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
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
}
This is the code at the 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!
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