Hello,
I have an Arduino Uno and two Atlas Scientific sensors (pH and temperature). I am attempting to display pH and temperature readings on the serial monitor of the Arduino from the same Arduino code. I have successfully printed data from the pH and temperature sensors independently of one another, but for some reason when I tried to combine the codes only pH data outputs upon the serial monitor. I am new to Arduino and Atlas Scientific products. Any advice would be much appreciated!
Test.ino (7.77 KB)
#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
#define rx1 8
#define tx1 9
SoftwareSerial myserial(rx, tx); //define how the soft serial port is going to work
SoftwareSerial myserial1(rx1, tx1); //define how the soft serial port is going to work
String inputstring = ""; //a string to hold incoming data from the PC
String sensorstring = ""; //a string to hold the data from the Atlas Scientific product
String sensorstring1 = ""; //a string to hold the data from the Atlas Scientific product
boolean input_string_complete = false; //have we received all the data from the PC
boolean sensor_string_complete = false; //have we received all the data from the Atlas Scientific product
boolean sensor_string_complete1 = false; //have we received all the data from the Atlas Scientific product
float temperature; //used to hold a floating point number that is the RTD temperature
float pH;
//long period = 120000;
//long period = 1800000;
//long period = 2700000;
//long period = 3600000;
//unsigned long time_now = 0;
//unsigned long time_now1 = 60000;
void setup() { //set up the hardware
Serial.begin(9600); //set baud rate for the hardware serial port_0 to 9600
myserial.begin(9600); //set baud rate for the software serial port to 9600
myserial1.begin(9600); //set baud rate for the software serial port to 9600
inputstring.reserve(10); //set aside some bytes for receiving data from the PC
sensorstring.reserve(30); //set aside some bytes for receiving data from Atlas Scientific product
sensorstring1.reserve(30); //set aside some bytes for receiving data from Atlas Scientific product
}
void serialEvent() { //if the hardware serial port_0 receives a char
inputstring = Serial.readStringUntil(13); //read the string until we see a <CR>
input_string_complete = true; //set the flag used to tell if we have received a completed string from the PC
}
void loop() { //here we go...
if (input_string_complete) { //if a string from the PC has been received in its entirety
myserial.print(inputstring); //send that string to the Atlas Scientific product
myserial.print('\r'); //add a <CR> to the end of the string
inputstring = ""; //clear the string
input_string_complete = false; //reset the flag used to tell if we have received a completed string from the PC
}
if (myserial.available() > 0) { //if we see that the Atlas Scientific product has sent a character
char inchar = (char)myserial.read(); //get the char we just received
sensorstring += inchar; //add the char to the var called sensorstring
if (inchar == '\r') { //if the incoming character is a <CR>
sensor_string_complete = true; //set the flag
}
}
if (sensor_string_complete == true) { //if a string from the Atlas Scientific product has been received in its entirety
Serial.println(sensorstring);
//if(millis() > time_now + period){
//time_now = millis();
//Serial.println(sensorstring);
//}
// Serial.println(sensorstring); //send that string to the PC's serial monitor
// if (isdigit(sensorstring[0])) { //if the first character in the string is a digit
// temperature = sensorstring.toFloat(); //convert the string to a floating point number so it can be evaluated by the Arduino
// if (temperature >= 25.0) { //if the RTD temperature is greater than or equal to 25 C
// Serial.println("high"); //print "high" this is demonstrating that the Arduino is evaluating the RTD temperature as a number and not as a string
// }
// if (temperature <= 24.999) { //if the RTD temperature is less than or equal to 24.999 C
// Serial.println("low"); //print "low" this is demonstrating that the Arduino is evaluating the RTD temperature as a number and not as a string
// }
// }
sensorstring = ""; //clear the string
sensor_string_complete = false; //reset the flag used to tell if we have received a completed string from the Atlas Scientific product
}
if (myserial1.available() > 0) { //if we see that the Atlas Scientific product has sent a character
char inchar1 = (char)myserial1.read(); //get the char we just received
sensorstring1 += inchar1; //add the char to the var called sensorstring
if (inchar1 == '\r') { //if the incoming character is a <CR>
sensor_string_complete1 = true; //set the flag
}
}
if (sensor_string_complete1 == true) { //if a string from the Atlas Scientific product has been received in its entirety
Serial.println(sensorstring1); //send that string to the PC's serial monitor
//if(millis() > time_now1+ period){
//time_now1 = millis();
//Serial.println(sensorstring1);
//}
/* //uncomment this section to see how to convert the pH reading from a string to a float
if (isdigit(sensorstring[0])) { //if the first character in the string is a digit
pH = sensorstring.toFloat(); //convert the string to a floating point number so it can be evaluated by the Arduino
if (pH >= 7.0) { //if the pH is greater than or equal to 7.0
Serial.println("high"); //print "high" this is demonstrating that the Arduino is evaluating the pH as a number and not as a string
}
if (pH <= 6.999) { //if the pH is less than or equal to 6.999
Serial.println("low"); //print "low" this is demonstrating that the Arduino is evaluating the pH as a number and not as a string
}
}
*/
sensorstring1 = ""; //clear the string
sensor_string_complete1 = false; //reset the flag used to tell if we have received a completed string from the Atlas Scientific product
}
}
Hi @Delta_G,
the parts of the code relating to temperature that are commented out just prevent the printing of "high" or "low" if the temperature is above or below a certain threshold.
I was hoping to see both temperature and pH values output upon the serial monitor. From my research I believe this is possible, although I am not sure how to go about doing so in the Arduino code.
