dvernier
commented
4 years ago Hello,
I will try to answer your questions below.
The library(VernierLib) provided by Vernier does not work with the ISEs I bought from Vernier. It gives 0.00 output for all the ISEs.
How are you using the ISE’s?. Are you attaching them to the Vernier Shield? What Arduino are you using?
Also, when I capture the value from Analog2 port, the values are not stable for High or low-value solutions. Please help!
The library is only for use on the Analog 1 port of the shield. You can write your own programs to read the analog voltage from Analog 2, if you want.
Also, one thing I noticed that for Ammonium ISE, the ISE behaves as -ve linear way, which is just opposite of what is mentioned on the website. Similarly, for nitrate, it behaves in a +ve linearly way but opposite to what is mentioned on the website(-ve linearly).
I am not clear what you mean here. Certainly the calibration of the ISEs is very non-linear. Also, for the ISE’s the library will read mV, not concentration.
I am attaching the four files having values for 1 PPM and 100 PPM from Nitrate ISE with a simple analog read the program and an analog read program with averaged value.
Data is almost similar for both 1 PPM and 100 PPM.
I am not clear on what you are doing here. It seems that you are writing your own program, not using the VernierLib library, which is fine, but I assume you are reading raw voltage. That should change with concentration.
What educational institution are you with. I assume this is a project to teach students coding or doing student projects. That is what the library was designed for.
Dave
David L. Vernier Founder and Co-President Vernier Software & Technology 13979 SW Millikan Way Beaverton, OR 97005 503-277-2299 1-888-Vernier (1-888-837-6437) dvernier@vernier.com www.vernier.com
On Thu, Aug 13, 2020 at 5:39 AM preity1802 notifications@github.com wrote:
The library(VernierLib) provided by Vernier does not work with the ISEs I bought from Vernier. It gives 0.00 output for all the ISEs. Also, when I capture the value from Analog2 port, the values are not stable for High or low-value solutions. Please help!
The attached screenshot is for the type of output when I am reading it from Analog2. It is averaged for 10 consecutive values. It looks the same for both 1 PPM and 100 PPM solutions.
Also, one thing I noticed that for Ammonium ISE, the ISE behaves as -ve linear way, which is just opposite of what is mentioned on the website. Similarly, for nitrate, it behaves in a +ve linearly way but opposite to what is mentioned on the website(-ve linearly).
13-08-2020 17:50 PM: I am attaching the four files having values for 1 PPM and 100 PPM from Nitrate ISE with a simple analog read the program and an analog read program with averaged value. Data is almost similar for both 1 PPM and 100 PPM.
Program with averaging: void setup() { Serial.begin(9600); Serial.println("CLEARDATA"); //clears up any data left from previous projects
Serial.println("LABEL,Time,Timer,sensorVoltage"); //always write LABEL, so excel knows the next things will be the names of the columns (instead of Acolumn you could write Time for instance)
Serial.println("RESETTIMER"); //resets timer to 0 }
void loop() { float sensorVoltage,sensorReading; // declares a variable named sensorVoltage int numberAveraged = 10; //number of readings averaged for reading reported int i,count; int sum = 0; float voltage;
for (i = 0 ; i < numberAveraged; i++) { count = analogRead(A2); //read 0 to 5 volt analog lines Analog 2 sum = sum + count; } sensorVoltage = ((sum / numberAveraged) * 5.0)/ 1024.0; //convert average count to voltage (0 to 5 volt input) Serial.print("DATA,TIME,TIMER,sensorVoltage"); Serial.println(sensorVoltage); delay(100); // delay in between reads in milliseconds }
Program without averaging: 13-08-2020Nitrate-1 PPM averaged.xlsx 13-08-2020_Nitrate-1 PPM_without averaged.xlsx 13-08-2020Nitrate-100 PPM averaged.xlsx 13-08-2020_Nitrate-100 PPM_without averaged.xlsx void setup() { Serial.begin(9600); Serial.println("CLEARDATA"); //clears up any data left from previous projects
Serial.println("LABEL,Time,Timer,sensorVoltage"); //always write LABEL, so excel knows the next things will be the names of the columns (instead of Acolumn you could write Time for instance)
Serial.println("RESETTIMER"); //resets timer to 0 }
void loop() { float sensorVoltage,sensorReading; // declares a variable named sensorVoltage int sensorValue = analogRead(A2); sensorVoltage = sensorValue * 5.0 / 1023;// Converts the count to the sensor voltage Serial.print("DATA,TIME,TIMER,sensorVoltage"); Serial.println(sensorVoltage); delay(100); // delay in between reads in milliseconds } 13-08-2020Nitrate-1 PPM averaged.xlsx https://github.com/VernierST/arduino/files/5069045/13-08-2020_Nitrate-1.PPM_.averaged.xlsx 13-08-2020_Nitrate-1 PPM_without averaged.xlsx https://github.com/VernierST/arduino/files/5069046/13-08-2020_Nitrate-1.PPM_without.averaged.xlsx 13-08-2020Nitrate-100 PPM averaged.xlsx https://github.com/VernierST/arduino/files/5069047/13-08-2020_Nitrate-100.PPM_.averaged.xlsx 13-08-2020_Nitrate-100 PPM_without averaged.xlsx https://github.com/VernierST/arduino/files/5069048/13-08-2020_Nitrate-100.PPM_without.averaged.xlsx [image: Screenshot (45)] https://user-images.githubusercontent.com/58470152/90135307-1d033500-dd90-11ea-8a31-206988a137c4.png
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preity1802
For reference:
The library(VernierLib) provided by Vernier does not work with the ISEs I bought from Vernier. It gives 0.00 output for all the ISEs. Also, when I capture the value from Analog2 port, the values are not stable for High or low-value solutions. Please help!
The attached screenshot is for the type of output when I am reading it from Analog2. It is averaged for 10 consecutive values. It looks the same for both 1 PPM and 100 PPM solutions.
Also, one thing I noticed that for Ammonium ISE, the ISE behaves as -ve linear way, which is just opposite of what is mentioned on the website. Similarly, for nitrate, it behaves in a +ve linearly way but opposite to what is mentioned on the website(-ve linearly).
13-08-2020 17:50 PM: I am attaching the four files having values for 1 PPM and 100 PPM from Nitrate ISE with a simple analog read the program and an analog read program with averaged value. Data is almost similar for both 1 PPM and 100 PPM.
Program with averaging: void setup() { Serial.begin(9600); Serial.println("CLEARDATA"); //clears up any data left from previous projects
Serial.println("LABEL,Time,Timer,sensorVoltage"); //always write LABEL, so excel knows the next things will be the names of the columns (instead of Acolumn you could write Time for instance)
Serial.println("RESETTIMER"); //resets timer to 0 }
void loop() { float sensorVoltage,sensorReading; // declares a variable named sensorVoltage int numberAveraged = 10; //number of readings averaged for reading reported int i,count; int sum = 0; float voltage;
for (i = 0 ; i < numberAveraged; i++) { count = analogRead(A2); //read 0 to 5 volt analog lines Analog 2 sum = sum + count; } sensorVoltage = ((sum / numberAveraged) * 5.0)/ 1024.0; //convert average count to voltage (0 to 5 volt input) Serial.print("DATA,TIME,TIMER,sensorVoltage"); Serial.println(sensorVoltage); delay(100); // delay in between reads in milliseconds }
Program without averaging: 13-08-2020Nitrate-1 PPM averaged.xlsx 13-08-2020_Nitrate-1 PPM_without averaged.xlsx 13-08-2020Nitrate-100 PPM averaged.xlsx 13-08-2020_Nitrate-100 PPM_without averaged.xlsx void setup() { Serial.begin(9600); Serial.println("CLEARDATA"); //clears up any data left from previous projects
Serial.println("LABEL,Time,Timer,sensorVoltage"); //always write LABEL, so excel knows the next things will be the names of the columns (instead of Acolumn you could write Time for instance)
Serial.println("RESETTIMER"); //resets timer to 0 }
void loop() { float sensorVoltage,sensorReading; // declares a variable named sensorVoltage int sensorValue = analogRead(A2); sensorVoltage = sensorValue * 5.0 / 1023;// Converts the count to the sensor voltage Serial.print("DATA,TIME,TIMER,sensorVoltage"); Serial.println(sensorVoltage); delay(100); // delay in between reads in milliseconds } 13-08-2020Nitrate-1 PPM averaged.xlsx 13-08-2020_Nitrate-1 PPM_without averaged.xlsx 13-08-2020Nitrate-100 PPM averaged.xlsx 13-08-2020_Nitrate-100 PPM_without averaged.xlsx