Hello
I have the following product:
https://www.atlas-scientific.com/product_pages/circuits/ezo_ph.html?
Datasheet: https://www.atlas-scientific.com/_files/_datasheets/_circuit/pH_EZO_datasheet.pdf?
sample code: https://www.atlas-scientific.com/_files/code/Arduino_pH_sample_code.pdf?
I am using the Arduino Uno
My problem is a simple one, but after long playing around I haven't found the solution so I hope someone here from the forum can point me in the right direction.
When I use the sample code from Atlas scientific I don't get any readings in the serial monitor.
But I am sure the Arduino, ph circuit and wiring is working correctly because when i use the Super_EZ_Com method i get the readings on the serial monitor.
//This code has intentionally has been written to be overly lengthy and includes unnecessary steps.
//Many parts of this code can be truncated. This code was written to be easy to understand.
//Code efficiency was not considered. Modify this code as you see fit.
//This code will output data to the Arduino serial monitor. Type commands into the Arduino serial monitor to control the pH circuit.
//set the var Arduino_only to equal 1 to watch the Arduino take over control of the pH circuit.
//As of 11/6/14 the default baud rate has changed to 9600.
//The old defaul baud rate was 38400.
#include <SoftwareSerial.h> //we have to include the SoftwareSerial library, or else we can't use it.
#define rx 2 //define what pin rx is going to be.
#define tx 3 //define what pin Tx is going to be.
SoftwareSerial myserial(rx, tx); //define how the soft serial port is going to work.
char ph_data[20]; //we make a 20 byte character array to hold incoming data from the pH.
char computerdata[20]; //we make a 20 byte character array to hold incoming data from a pc/mac/other.
byte received_from_computer=0; //we need to know how many characters have been received.
byte received_from_sensor=0; //we need to know how many characters have been received.
byte arduino_only=0; //if you would like to operate the pH Circuit with the Arduino only and not use the serial monitor to send it commands set this to 1. The data will still come out on the serial monitor, so you can see it working.
byte startup=0; //used to make sure the Arduino takes over control of the pH Circuit properly.
float ph=0; //used to hold a floating point number that is the pH.
byte string_received=0; //used to identify when we have received a string from the pH circuit.
void setup(){
Serial.begin(9600); //enable the hardware serial port
myserial.begin(9600); //enable the software serial port
}
void serialEvent(){ //this interrupt will trigger when the data coming from the serial monitor(pc/mac/other) is received.
if(arduino_only!=1){ //if Arduino_only does not equal 1 this function will be bypassed.
received_from_computer=Serial.readBytesUntil(13,computerdata,20); //we read the data sent from the serial monitor(pc/mac/other) until we see a <CR>. We also count how many characters have been received.
computerdata[received_from_computer]=0; //we add a 0 to the spot in the array just after the last character we received.. This will stop us from transmitting incorrect data that may have been left in the buffer.
myserial.print(computerdata); //we transmit the data received from the serial monitor(pc/mac/other) through the soft serial port to the pH Circuit.
myserial.print('\r'); //all data sent to the pH Circuit must end with a <CR>.
}
}
void loop(){
if(myserial.available() > 0){ //if we see that the pH Circuit has sent a character.
received_from_sensor=myserial.readBytesUntil(13,ph_data,20); //we read the data sent from pH Circuit until we see a <CR>. We also count how many character have been received.
ph_data[received_from_sensor]=0; //we add a 0 to the spot in the array just after the last character we received. This will stop us from transmitting incorrect data that may have been left in the buffer.
string_received=1; //a flag used when the Arduino is controlling the pH Circuit to let us know that a complete string has been received.
Serial.println(ph_data); //lets transmit that data received from the pH Circuit to the serial monitor.
}
if(arduino_only==1){Arduino_Control();} //If the var arduino_only is set to one we will call this function. Letting the Arduino take over control of the pH Circuit
}
void Arduino_Control(){
if(startup==0){ //if the Arduino just booted up, we need to set some things up first.
myserial.print("c,0\r"); //take the pH Circuit out of continues mode.
delay(50); //on start up sometimes the first command is missed.
myserial.print("c,0\r"); //so, let’s send it twice.
delay(50); //a short delay after the pH Circuit was taken out of continues mode is used to make sure we don’t over load it with commands.
startup=1; //startup is completed, let's not do this again during normal operation.
}
delay(800); //we will take a reading ever 800ms. You can make this much longer or shorter if you like.
myserial.print("R\r"); //send it the command to take a single reading.
if(string_received==1){ //did we get data back from the ph Circuit?
ph=atof(ph_data); //many people ask us "how do I convert a string into a float?" This is how...
if(ph>=7.5){Serial.println("high\r");} //This is the proof that it has been converted into a float.
if(ph<7.5){Serial.println("low\r");} //This is the proof that it has been converted into a float.
string_received=0;} //reset the string received flag.
}
//here are some functions you might find useful
//these functions are not enabled
void cal_s(){ //calibrate to a pH of 7
myserial.print("cal,mid,7\r");} //send the "cal,mid,7" command to calibrate to a pH of 7.00
void cal_f(){ //calibrate to a pH of 4
myserial.print("cal,low,4\r");} //send the "cal,low,4" command to calibrate to a pH of 4.00
void cal_t(){ //calibrate to a pH of 10.00
myserial.print("cal,high,10\r");} //send the "cal,high,10" command to calibrate to a pH of 10.00
void phFactoryDefault(){ //factory defaults the pH circuit
myserial.print("X\r");} //send the "X" command to factory reset the device
void read_info(){ //get device info
myserial.print("I\r");} //send the "I" command to query the information
void phSetLEDs(byte enabled) //turn the LEDs on or off
{
if(enabled) //if enabled is > 0
myserial.print("L,1\r"); //the LED's will turn ON
else //if enabled is 0
myserial.print("L,0\r"); //the LED's will turn OFF
}
Thank you very much for your help!